First version of the SOurce SDK 2013

1 files changed, 2143 insertions, 0 deletions

diff --git a/mp/src/game/server/physobj.cpp b/mp/src/game/server/physobj.cpp
new file mode 100644
index 00000000..9a48a76f
--- /dev/null
+++ b/mp/src/game/server/physobj.cpp
@@ -0,0 +1,2143 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//

+//

+// Purpose: 

+//

+// $NoKeywords: $

+//=============================================================================//

+

+#include "cbase.h"

+#include "player.h"

+#include "vphysics_interface.h"

+#include "physics.h"

+#include "vcollide_parse.h"

+#include "entitylist.h"

+#include "physobj.h"

+#include "hierarchy.h"

+#include "game.h"

+#include "ndebugoverlay.h"

+#include "engine/IEngineSound.h"

+#include "model_types.h"

+#include "props.h"

+#include "physics_saverestore.h"

+#include "saverestore_utlvector.h"

+#include "vphysics/constraints.h"

+#include "collisionutils.h"

+#include "decals.h"

+#include "bone_setup.h"

+

+// memdbgon must be the last include file in a .cpp file!!!

+#include "tier0/memdbgon.h"

+

+ConVar debug_physimpact("debug_physimpact", "0" );

+

+const char *GetMassEquivalent(float flMass);

+

+// This is a physically simulated spring, used to join objects together and create spring forces

+//

+// NOTE: Springs are not physical in the sense that they only create force, they do not collide with

+// anything or have any REAL constraints.  They can be stretched infinitely (though this will create

+// and infinite force), they can penetrate any other object (or spring). They do not occupy any space.

+// 

+

+#define SF_SPRING_ONLYSTRETCH		0x0001

+

+class CPhysicsSpring : public CBaseEntity

+{

+	DECLARE_CLASS( CPhysicsSpring, CBaseEntity );

+public:

+	CPhysicsSpring();

+	~CPhysicsSpring();

+

+	void	Spawn( void );

+	void	Activate( void );

+

+	// Inputs

+	void InputSetSpringConstant( inputdata_t &inputdata );

+	void InputSetSpringDamping( inputdata_t &inputdata );

+	void InputSetSpringLength( inputdata_t &inputdata );

+

+	// Debug

+	int		DrawDebugTextOverlays(void);

+	void	DrawDebugGeometryOverlays(void);

+

+	void GetSpringObjectConnections( string_t nameStart, string_t nameEnd, IPhysicsObject **pStart, IPhysicsObject **pEnd );

+	void NotifySystemEvent( CBaseEntity *pNotify, notify_system_event_t eventType, const notify_system_event_params_t &params );

+	IPhysicsObject *GetStartObject() { return m_pSpring ? m_pSpring->GetStartObject() : NULL; }

+	IPhysicsObject *GetEndObject() { return m_pSpring ? m_pSpring->GetEndObject() : NULL; }

+

+	DECLARE_DATADESC();

+

+private:	

+	IPhysicsSpring		*m_pSpring;

+	bool			m_isLocal;

+

+	// These are "template" values used to construct the spring.  After creation, they are not needed

+	float			m_tempConstant;

+	float			m_tempLength;	// This is the "ideal" length of the spring, not the length it is currently stretched to.

+	float			m_tempDamping;

+	float			m_tempRelativeDamping;

+

+	string_t		m_nameAttachStart;

+	string_t		m_nameAttachEnd;

+	Vector			m_start;

+	Vector			m_end;

+	unsigned int 	m_teleportTick;

+};

+

+LINK_ENTITY_TO_CLASS( phys_spring, CPhysicsSpring );

+

+BEGIN_DATADESC( CPhysicsSpring )

+

+	DEFINE_PHYSPTR( m_pSpring ),

+

+	DEFINE_KEYFIELD( m_tempConstant, FIELD_FLOAT, "constant" ),

+	DEFINE_KEYFIELD( m_tempLength, FIELD_FLOAT, "length" ),

+	DEFINE_KEYFIELD( m_tempDamping, FIELD_FLOAT, "damping" ),

+	DEFINE_KEYFIELD( m_tempRelativeDamping, FIELD_FLOAT, "relativedamping" ),

+

+	DEFINE_KEYFIELD( m_nameAttachStart, FIELD_STRING, "attach1" ),

+	DEFINE_KEYFIELD( m_nameAttachEnd, FIELD_STRING, "attach2" ),

+

+	DEFINE_FIELD( m_start, FIELD_POSITION_VECTOR ),

+	DEFINE_KEYFIELD( m_end, FIELD_POSITION_VECTOR, "springaxis" ),

+	DEFINE_FIELD( m_isLocal, FIELD_BOOLEAN ),

+

+	// Not necessary to save... it's only there to make sure 

+//	DEFINE_FIELD( m_teleportTick, FIELD_INTEGER ),

+

+	// Inputs

+	DEFINE_INPUTFUNC( FIELD_FLOAT, "SetSpringConstant", InputSetSpringConstant ),

+	DEFINE_INPUTFUNC( FIELD_FLOAT, "SetSpringLength", InputSetSpringLength ),

+	DEFINE_INPUTFUNC( FIELD_FLOAT, "SetSpringDamping", InputSetSpringDamping ),

+

+END_DATADESC()

+

+// debug function - slow, uses dynamic_cast<> - use this to query the attached objects

+// physics_debug_entity toggles the constraint system for an object using this

+bool GetSpringAttachments( CBaseEntity *pEntity, CBaseEntity *pAttachOut[2], IPhysicsObject *pAttachVPhysics[2] )

+{

+	CPhysicsSpring *pSpringEntity = dynamic_cast<CPhysicsSpring *>(pEntity);

+	if ( pSpringEntity )

+	{

+		IPhysicsObject *pRef = pSpringEntity->GetStartObject();

+		pAttachOut[0] = pRef ? static_cast<CBaseEntity *>(pRef->GetGameData()) : NULL;

+		pAttachVPhysics[0] = pRef;

+		IPhysicsObject *pAttach = pSpringEntity->GetEndObject();

+		pAttachOut[1] = pAttach ? static_cast<CBaseEntity *>(pAttach->GetGameData()) : NULL;

+		pAttachVPhysics[1] = pAttach;

+		return true;

+	}

+	return false;

+}

+

+

+CPhysicsSpring::CPhysicsSpring( void )

+{

+#ifdef _DEBUG

+	m_start.Init();

+	m_end.Init();

+#endif

+	m_pSpring = NULL;

+	m_tempConstant = 150;

+	m_tempLength = 0;

+	m_tempDamping = 2.0;

+	m_tempRelativeDamping = 0.01;

+	m_isLocal = false;

+	m_teleportTick = 0xFFFFFFFF;

+}

+

+CPhysicsSpring::~CPhysicsSpring( void )

+{

+	if ( m_pSpring )

+	{

+		physenv->DestroySpring( m_pSpring );

+	}

+}

+

+

+//------------------------------------------------------------------------------

+// Purpose:

+//------------------------------------------------------------------------------

+void CPhysicsSpring::InputSetSpringConstant( inputdata_t &inputdata )

+{

+	m_tempConstant = inputdata.value.Float();

+	m_pSpring->SetSpringConstant(inputdata.value.Float());

+}

+

+

+//------------------------------------------------------------------------------

+// Purpose:

+//------------------------------------------------------------------------------

+void CPhysicsSpring::InputSetSpringDamping( inputdata_t &inputdata )

+{

+	m_tempDamping = inputdata.value.Float();

+	m_pSpring->SetSpringDamping(inputdata.value.Float());

+}

+

+

+//------------------------------------------------------------------------------

+// Purpose:

+//------------------------------------------------------------------------------

+void CPhysicsSpring::InputSetSpringLength( inputdata_t &inputdata )

+{

+	m_tempLength = inputdata.value.Float();

+	m_pSpring->SetSpringLength(inputdata.value.Float());

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Draw any debug text overlays

+// Output : Current text offset from the top

+//-----------------------------------------------------------------------------

+int CPhysicsSpring::DrawDebugTextOverlays(void) 

+{

+	int text_offset = BaseClass::DrawDebugTextOverlays();

+

+	if (m_debugOverlays & OVERLAY_TEXT_BIT) 

+	{

+		char tempstr[512];

+		Q_snprintf(tempstr,sizeof(tempstr),"Constant: %3.2f",m_tempConstant);

+		EntityText(text_offset,tempstr,0);

+		text_offset++;

+

+		Q_snprintf(tempstr,sizeof(tempstr),"Length: %3.2f",m_tempLength);

+		EntityText(text_offset,tempstr,0);

+		text_offset++;

+

+		Q_snprintf(tempstr,sizeof(tempstr),"Damping: %3.2f",m_tempDamping);

+		EntityText(text_offset,tempstr,0);

+		text_offset++;

+

+	}

+	return text_offset;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Override base class to add display of fly direction

+// Input  :

+// Output : 

+//-----------------------------------------------------------------------------

+void CPhysicsSpring::DrawDebugGeometryOverlays(void) 

+{

+	if ( !m_pSpring )

+		return;

+

+	// ------------------------------

+	// Draw if BBOX is on

+	// ------------------------------

+	if (m_debugOverlays & OVERLAY_BBOX_BIT)

+	{

+		Vector vStartPos;

+		Vector vEndPos;

+		m_pSpring->GetEndpoints( &vStartPos, &vEndPos );

+

+		Vector vSpringDir = vEndPos - vStartPos;

+		VectorNormalize(vSpringDir);

+

+		Vector vLength = vStartPos + (vSpringDir*m_tempLength);

+

+		NDebugOverlay::Line(vStartPos, vLength, 0,0,255, false, 0);

+		NDebugOverlay::Line(vLength, vEndPos, 255,0,0, false, 0);

+	}

+	BaseClass::DrawDebugGeometryOverlays();

+}

+

+bool PointIsNearer( IPhysicsObject *pObject1, const Vector &point1, const Vector &point2 )

+{

+	Vector center;

+	

+	pObject1->GetPosition( &center, 0 );

+

+	float dist1 = (center - point1).LengthSqr();

+	float dist2 = (center - point2).LengthSqr();

+

+	if ( dist1 < dist2 )

+		return true;

+

+	return false;

+}

+

+void CPhysicsSpring::GetSpringObjectConnections( string_t nameStart, string_t nameEnd, IPhysicsObject **pStart, IPhysicsObject **pEnd )

+{

+	IPhysicsObject *pStartObject = FindPhysicsObjectByName( STRING(nameStart), this );

+	IPhysicsObject *pEndObject = FindPhysicsObjectByName( STRING(nameEnd), this );

+

+	// Assume the world for missing objects

+	if ( !pStartObject )

+	{

+		pStartObject = g_PhysWorldObject;

+	}

+	else if ( !pEndObject )

+	{

+		// try to sort so that the world is always the start object

+		pEndObject = pStartObject;

+		pStartObject = g_PhysWorldObject;

+	}

+	else

+	{

+		CBaseEntity *pEntity0 = (CBaseEntity *) (pStartObject->GetGameData());

+		if ( pEntity0 )

+		{

+			g_pNotify->AddEntity( this, pEntity0 );

+		}

+

+		CBaseEntity *pEntity1 = (CBaseEntity *) pEndObject->GetGameData();

+		if ( pEntity1 )

+		{

+			g_pNotify->AddEntity( this, pEntity1 );

+		}

+	}

+

+	*pStart = pStartObject;

+	*pEnd = pEndObject;

+}

+

+

+void CPhysicsSpring::Activate( void )

+{

+	BaseClass::Activate();

+

+	// UNDONE: save/restore all data, and only create the spring here

+

+	if ( !m_pSpring )

+	{

+		IPhysicsObject *pStart, *pEnd;

+

+		GetSpringObjectConnections( m_nameAttachStart, m_nameAttachEnd, &pStart, &pEnd );

+

+		// Needs to connect to real, different objects

+		if ( (!pStart || !pEnd) || (pStart == pEnd) )

+		{

+			DevMsg("ERROR: Can't init spring %s from \"%s\" to \"%s\"\n", GetDebugName(), STRING(m_nameAttachStart), STRING(m_nameAttachEnd) );

+			UTIL_Remove( this );

+			return;

+		}

+

+		// if m_end is not closer to pEnd than m_start, swap

+		if ( !PointIsNearer( pEnd, m_end, m_start ) )

+		{

+			Vector tmpVec = m_start;

+			m_start = m_end;

+			m_end = tmpVec;

+		}

+

+		// create the spring

+		springparams_t spring;

+		spring.constant = m_tempConstant;

+		spring.damping = m_tempDamping;

+		spring.naturalLength = m_tempLength;

+		spring.relativeDamping = m_tempRelativeDamping;

+		spring.startPosition = m_start;

+		spring.endPosition = m_end;

+		spring.useLocalPositions = false;

+		spring.onlyStretch = HasSpawnFlags( SF_SPRING_ONLYSTRETCH );

+		m_pSpring = physenv->CreateSpring( pStart, pEnd, &spring );

+	}

+}

+

+

+void CPhysicsSpring::Spawn( void )

+{

+	SetSolid( SOLID_NONE );

+	m_start = GetAbsOrigin();

+	if ( m_tempLength <= 0 )

+	{

+		m_tempLength = (m_end - m_start).Length();

+	}

+}

+

+void CPhysicsSpring::NotifySystemEvent( CBaseEntity *pNotify, notify_system_event_t eventType, const notify_system_event_params_t &params )

+{

+	// don't recurse

+	if ( eventType != NOTIFY_EVENT_TELEPORT || (unsigned int)gpGlobals->tickcount == m_teleportTick )

+		return;

+

+	m_teleportTick = gpGlobals->tickcount;

+	PhysTeleportConstrainedEntity( pNotify, m_pSpring->GetStartObject(), m_pSpring->GetEndObject(), params.pTeleport->prevOrigin, params.pTeleport->prevAngles, params.pTeleport->physicsRotate );

+}

+

+

+// ---------------------------------------------------------------------

+//

+// CPhysBox -- physically simulated brush

+//

+// ---------------------------------------------------------------------

+

+// SendTable stuff.

+IMPLEMENT_SERVERCLASS_ST(CPhysBox, DT_PhysBox)

+END_SEND_TABLE()

+

+LINK_ENTITY_TO_CLASS( func_physbox, CPhysBox );

+

+BEGIN_DATADESC( CPhysBox )

+

+	DEFINE_FIELD( m_hCarryingPlayer, FIELD_EHANDLE ),

+

+	DEFINE_KEYFIELD( m_massScale, FIELD_FLOAT, "massScale" ),

+	DEFINE_KEYFIELD( m_damageType, FIELD_INTEGER, "Damagetype" ),

+	DEFINE_KEYFIELD( m_iszOverrideScript, FIELD_STRING, "overridescript" ),

+	DEFINE_KEYFIELD( m_damageToEnableMotion, FIELD_INTEGER, "damagetoenablemotion" ),

+	DEFINE_KEYFIELD( m_flForceToEnableMotion, FIELD_FLOAT, "forcetoenablemotion" ), 

+	DEFINE_KEYFIELD( m_angPreferredCarryAngles, FIELD_VECTOR, "preferredcarryangles" ),

+	DEFINE_KEYFIELD( m_bNotSolidToWorld, FIELD_BOOLEAN, "notsolid" ),

+

+	DEFINE_INPUTFUNC( FIELD_VOID, "Wake", InputWake ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "Sleep", InputSleep ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "EnableMotion", InputEnableMotion ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "DisableMotion", InputDisableMotion ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "ForceDrop", InputForceDrop ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "DisableFloating", InputDisableFloating ),

+

+	// Function pointers

+	DEFINE_ENTITYFUNC( BreakTouch ),

+

+	// Outputs

+	DEFINE_OUTPUT( m_OnDamaged, "OnDamaged" ),

+	DEFINE_OUTPUT( m_OnAwakened, "OnAwakened" ),

+	DEFINE_OUTPUT( m_OnMotionEnabled, "OnMotionEnabled" ),

+	DEFINE_OUTPUT( m_OnPhysGunPickup, "OnPhysGunPickup" ),

+	DEFINE_OUTPUT( m_OnPhysGunPunt, "OnPhysGunPunt" ),

+	DEFINE_OUTPUT( m_OnPhysGunOnlyPickup, "OnPhysGunOnlyPickup" ),

+	DEFINE_OUTPUT( m_OnPhysGunDrop, "OnPhysGunDrop" ),

+	DEFINE_OUTPUT( m_OnPlayerUse, "OnPlayerUse" ),

+

+END_DATADESC()

+

+// UNDONE: Save/Restore needs to take the physics object's properties into account

+// UNDONE: Acceleration, velocity, angular velocity, etc. must be preserved

+// UNDONE: Many of these quantities are relative to a coordinate frame

+// UNDONE: Translate when going across transitions?

+// UNDONE: Build transition transformation, and transform data in save/restore for IPhysicsObject

+// UNDONE: Angles are saved in the entity, but not propagated back to the IPhysicsObject on restore

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysBox::Spawn( void )

+{

+	// Initialize damage modifiers. Must be done before baseclass spawn.

+	m_flDmgModBullet = func_breakdmg_bullet.GetFloat();

+	m_flDmgModClub = func_breakdmg_club.GetFloat();

+	m_flDmgModExplosive = func_breakdmg_explosive.GetFloat();

+

+	ParsePropData();

+

+	Precache();

+

+	m_iMaxHealth = ( m_iHealth > 0 ) ? m_iHealth : 1;

+

+	if ( HasSpawnFlags( SF_BREAK_TRIGGER_ONLY ) )

+	{

+		m_takedamage = DAMAGE_EVENTS_ONLY;

+		AddSpawnFlags( SF_BREAK_DONT_TAKE_PHYSICS_DAMAGE );

+	}

+	else if ( m_iHealth == 0 )

+	{

+		m_takedamage = DAMAGE_EVENTS_ONLY;

+		AddSpawnFlags( SF_BREAK_DONT_TAKE_PHYSICS_DAMAGE );

+	}

+	else

+	{

+		m_takedamage = DAMAGE_YES;

+	}

+  

+	SetMoveType( MOVETYPE_NONE );

+	SetAbsVelocity( vec3_origin );

+	SetModel( STRING( GetModelName() ) );

+	SetSolid( SOLID_VPHYSICS );

+	if ( HasSpawnFlags( SF_PHYSBOX_DEBRIS ) )

+	{

+		SetCollisionGroup( COLLISION_GROUP_DEBRIS );

+	}

+

+	if ( HasSpawnFlags( SF_PHYSBOX_NO_ROTORWASH_PUSH ) )

+	{

+		AddEFlags( EFL_NO_ROTORWASH_PUSH );

+	}

+

+	if ( m_bNotSolidToWorld )

+	{

+		AddSolidFlags( FSOLID_NOT_SOLID );

+	}

+	CreateVPhysics();

+

+	m_hCarryingPlayer = NULL;

+

+	SetTouch( &CPhysBox::BreakTouch );

+	if ( HasSpawnFlags( SF_BREAK_TRIGGER_ONLY ) )		// Only break on trigger

+	{

+		SetTouch( NULL );

+	}

+

+	if ( m_impactEnergyScale == 0 )

+	{

+		m_impactEnergyScale = 1.0;

+	}

+}

+

+// shared from studiomdl, checks for long, thin objects and adds some damping 

+// to prevent endless rolling due to low inertia

+static bool ShouldDampRotation( const CPhysCollide *pCollide )

+{

+	Vector mins, maxs;

+	physcollision->CollideGetAABB( &mins, &maxs, pCollide, vec3_origin, vec3_angle );

+	Vector size = maxs-mins;

+	int largest = 0;

+	float largeSize = size[0];

+	for ( int i = 1; i < 3; i++ )

+	{

+		if ( size[i] > largeSize )

+		{

+			largeSize = size[i];

+			largest = i;

+		}

+	}

+	size[largest] = 0;

+	float len = size.Length();

+	if ( len > 0 )

+	{

+		float sizeRatio = largeSize / len;

+		// HACKHACK: Hardcoded size ratio to induce damping

+		// This prevents long skinny objects from rolling endlessly

+		if ( sizeRatio > 9 )

+			return true;

+	}

+	return false;

+}

+

+

+bool CPhysBox::CreateVPhysics()

+{

+	solid_t tmpSolid;

+	PhysModelParseSolid( tmpSolid, this, GetModelIndex() );

+	if ( m_massScale > 0 )

+	{

+		tmpSolid.params.mass *= m_massScale;

+	}

+

+	vcollide_t *pVCollide = modelinfo->GetVCollide( GetModelIndex() );

+	PhysGetMassCenterOverride( this, pVCollide, tmpSolid );

+	PhysSolidOverride( tmpSolid, m_iszOverrideScript );

+	if ( tmpSolid.params.rotdamping < 1.0f && ShouldDampRotation(pVCollide->solids[0]) )

+	{

+		tmpSolid.params.rotdamping = 1.0f;

+	}

+	IPhysicsObject *pPhysics = VPhysicsInitNormal( GetSolid(), GetSolidFlags(), true, &tmpSolid );

+

+	if ( m_damageType == 1 )

+	{

+		PhysSetGameFlags( pPhysics, FVPHYSICS_DMG_SLICE );

+	}

+

+	// Wake it up if not asleep

+	if ( !HasSpawnFlags(SF_PHYSBOX_ASLEEP) )

+	{

+		pPhysics->Wake();

+	}

+

+	if ( HasSpawnFlags(SF_PHYSBOX_MOTIONDISABLED) || m_damageToEnableMotion > 0 || m_flForceToEnableMotion > 0 )

+	{

+		pPhysics->EnableMotion( false );

+	}

+

+	return true;

+}

+

+       

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+int CPhysBox::ObjectCaps() 

+{ 

+	int caps = BaseClass::ObjectCaps() | FCAP_WCEDIT_POSITION;

+	if ( HasSpawnFlags( SF_PHYSBOX_ENABLE_PICKUP_OUTPUT ) )

+	{

+		caps |= FCAP_IMPULSE_USE;

+	}

+	else if ( !HasSpawnFlags( SF_PHYSBOX_IGNOREUSE ) )

+	{

+		if ( CBasePlayer::CanPickupObject( this, 35, 128 ) )

+		{

+			caps |= FCAP_IMPULSE_USE;

+		}

+	}

+

+	return caps;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysBox::Use( CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value )

+{

+	CBasePlayer *pPlayer = ToBasePlayer( pActivator );

+	if ( pPlayer )

+	{

+		if ( HasSpawnFlags( SF_PHYSBOX_ENABLE_PICKUP_OUTPUT ) )

+		{

+			m_OnPlayerUse.FireOutput( this, this );

+		}

+

+		if ( !HasSpawnFlags( SF_PHYSBOX_IGNOREUSE ) )

+		{

+			pPlayer->PickupObject( this );

+		}

+	}

+}

+

+

+//-----------------------------------------------------------------------------

+//-----------------------------------------------------------------------------

+bool CPhysBox::CanBePickedUpByPhyscannon()

+{

+	if ( HasSpawnFlags( SF_PHYSBOX_NEVER_PICK_UP ) )

+		return false;

+

+	IPhysicsObject *pPhysicsObject = VPhysicsGetObject();

+	if ( !pPhysicsObject )

+		return false;

+		

+	if ( !pPhysicsObject->IsMotionEnabled() && !HasSpawnFlags( SF_PHYSBOX_ENABLE_ON_PHYSCANNON ) )

+		return false;		

+

+	return true;

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Draw any debug text overlays

+// Output : Current text offset from the top

+//-----------------------------------------------------------------------------

+int CPhysBox::DrawDebugTextOverlays(void) 

+{

+	int text_offset = BaseClass::DrawDebugTextOverlays();

+

+	if (m_debugOverlays & OVERLAY_TEXT_BIT) 

+	{

+		if (VPhysicsGetObject())

+		{

+			char tempstr[512];

+			Q_snprintf(tempstr, sizeof(tempstr),"Mass: %.2f kg / %.2f lb (%s)", VPhysicsGetObject()->GetMass(), kg2lbs(VPhysicsGetObject()->GetMass()), GetMassEquivalent(VPhysicsGetObject()->GetMass()));

+			EntityText( text_offset, tempstr, 0);

+			text_offset++;

+		}

+	}

+

+	return text_offset;

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Input handler that breaks the physics object away from its parent

+//			and starts it simulating.

+//-----------------------------------------------------------------------------

+void CPhysBox::InputWake( inputdata_t &inputdata )

+{

+	VPhysicsGetObject()->Wake();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Input handler that breaks the physics object away from its parent

+//			and stops it simulating.

+//-----------------------------------------------------------------------------

+void CPhysBox::InputSleep( inputdata_t &inputdata )

+{

+	VPhysicsGetObject()->Sleep();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Enable physics motion and collision response (on by default)

+//-----------------------------------------------------------------------------

+void CPhysBox::InputEnableMotion( inputdata_t &inputdata )

+{

+	EnableMotion();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysBox::EnableMotion( void )

+{

+	IPhysicsObject *pPhysicsObject = VPhysicsGetObject();

+	if ( pPhysicsObject != NULL )

+	{

+		pPhysicsObject->EnableMotion( true );

+		pPhysicsObject->Wake();

+	}

+

+	m_damageToEnableMotion = 0;

+	m_flForceToEnableMotion = 0;

+

+	m_OnMotionEnabled.FireOutput( this, this, 0 );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Disable any physics motion or collision response

+//-----------------------------------------------------------------------------

+void CPhysBox::InputDisableMotion( inputdata_t &inputdata )

+{

+	IPhysicsObject *pPhysicsObject = VPhysicsGetObject();

+	if ( pPhysicsObject != NULL )

+	{

+		pPhysicsObject->EnableMotion( false );

+	}

+}

+

+// Turn off floating simulation (and cost)

+void CPhysBox::InputDisableFloating( inputdata_t &inputdata )

+{

+	PhysEnableFloating( VPhysicsGetObject(), false );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: If we're being held by the player's hand/physgun, force it to drop us

+//-----------------------------------------------------------------------------

+void CPhysBox::InputForceDrop( inputdata_t &inputdata )

+{

+	if ( m_hCarryingPlayer )

+	{

+		m_hCarryingPlayer->ForceDropOfCarriedPhysObjects();

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysBox::Move( const Vector &direction )

+{

+	VPhysicsGetObject()->ApplyForceCenter( direction );

+}

+

+// Update the visible representation of the physic system's representation of this object

+void CPhysBox::VPhysicsUpdate( IPhysicsObject *pPhysics )

+{

+	BaseClass::VPhysicsUpdate( pPhysics );

+

+	// if this is the first time we have moved, fire our target

+	if ( HasSpawnFlags( SF_PHYSBOX_ASLEEP ) )

+	{

+		if ( !pPhysics->IsAsleep() )

+		{

+			m_OnAwakened.FireOutput(this, this);

+			FireTargets( STRING(m_target), this, this, USE_TOGGLE, 0 );

+			RemoveSpawnFlags( SF_PHYSBOX_ASLEEP );

+		}

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysBox::OnPhysGunPickup( CBasePlayer *pPhysGunUser, PhysGunPickup_t reason )

+{

+	if ( reason == PUNTED_BY_CANNON )

+	{

+		m_OnPhysGunPunt.FireOutput( pPhysGunUser, this );

+	}

+

+	IPhysicsObject *pPhysicsObject = VPhysicsGetObject();

+	if ( pPhysicsObject && !pPhysicsObject->IsMoveable() )

+	{

+		if ( !HasSpawnFlags( SF_PHYSBOX_ENABLE_ON_PHYSCANNON ) )

+			return;

+		EnableMotion();

+	}

+

+	m_OnPhysGunPickup.FireOutput( pPhysGunUser, this );

+

+	// Are we just being punted?

+	if ( reason == PUNTED_BY_CANNON )

+		return;

+

+	if( reason == PICKED_UP_BY_CANNON )

+	{

+		m_OnPhysGunOnlyPickup.FireOutput( pPhysGunUser, this );

+	}

+

+	m_hCarryingPlayer = pPhysGunUser;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysBox::OnPhysGunDrop( CBasePlayer *pPhysGunUser, PhysGunDrop_t Reason )

+{

+	BaseClass::OnPhysGunDrop( pPhysGunUser, Reason );

+

+	m_hCarryingPlayer = NULL;

+	m_OnPhysGunDrop.FireOutput( pPhysGunUser, this );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysBox::VPhysicsCollision( int index, gamevcollisionevent_t *pEvent )

+{

+	BaseClass::VPhysicsCollision( index, pEvent );

+

+	IPhysicsObject *pPhysObj = pEvent->pObjects[!index];

+

+	// If we have a force to enable motion, and we're still disabled, check to see if this should enable us

+	if ( m_flForceToEnableMotion )

+	{

+		CBaseEntity *pOther = static_cast<CBaseEntity *>(pPhysObj->GetGameData());

+

+		// Don't allow the player to bump an object active if we've requested not to

+		if ( ( pOther && pOther->IsPlayer() && HasSpawnFlags( SF_PHYSBOX_PREVENT_PLAYER_TOUCH_ENABLE ) ) == false )

+		{

+			// Large enough to enable motion?

+			float flForce = pEvent->collisionSpeed * pEvent->pObjects[!index]->GetMass();

+			if ( flForce >= m_flForceToEnableMotion )

+			{

+				EnableMotion();

+			}

+		}

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+int CPhysBox::OnTakeDamage( const CTakeDamageInfo &info )

+{

+	if ( IsMarkedForDeletion() )

+		return 0;

+

+	// note: if motion is disabled, OnTakeDamage can't apply physics force

+	int ret = BaseClass::OnTakeDamage( info );

+

+	if ( info.GetInflictor() )

+	{

+		m_OnDamaged.FireOutput( info.GetAttacker(), this );

+	}

+

+	// Have we been broken? If so, abort

+	if ( GetHealth() <= 0 )

+		return ret;

+

+	// If we have a force to enable motion, and we're still disabled, check to see if this should enable us

+	if ( m_flForceToEnableMotion )

+	{

+		// Large enough to enable motion?

+		float flForce = info.GetDamageForce().Length();

+		if ( flForce >= m_flForceToEnableMotion )

+		{

+			IPhysicsObject *pPhysicsObject = VPhysicsGetObject();

+			if ( pPhysicsObject )

+			{

+				EnableMotion();

+			}

+		}

+	}

+

+	// Check our health against the threshold:

+	if( m_damageToEnableMotion > 0 && GetHealth() < m_damageToEnableMotion )

+	{

+		EnableMotion();

+		VPhysicsTakeDamage( info );

+	}

+

+	return ret;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Return true if this physbox has preferred carry angles

+//-----------------------------------------------------------------------------

+bool CPhysBox::HasPreferredCarryAnglesForPlayer( CBasePlayer *pPlayer )

+{

+	return HasSpawnFlags( SF_PHYSBOX_USEPREFERRED );

+}

+

+

+// ---------------------------------------------------------------------

+//

+// CPhysExplosion -- physically simulated explosion

+//

+// ---------------------------------------------------------------------

+#define SF_PHYSEXPLOSION_NODAMAGE			0x0001

+#define SF_PHYSEXPLOSION_PUSH_PLAYER		0x0002

+#define SF_PHYSEXPLOSION_RADIAL				0x0004

+#define	SF_PHYSEXPLOSION_TEST_LOS			0x0008

+#define SF_PHYSEXPLOSION_DISORIENT_PLAYER	0x0010

+

+LINK_ENTITY_TO_CLASS( env_physexplosion, CPhysExplosion );

+

+BEGIN_DATADESC( CPhysExplosion )

+

+	DEFINE_KEYFIELD( m_damage, FIELD_FLOAT, "magnitude" ),

+	DEFINE_KEYFIELD( m_radius, FIELD_FLOAT, "radius" ),

+	DEFINE_KEYFIELD( m_targetEntityName, FIELD_STRING, "targetentityname" ),

+	DEFINE_KEYFIELD( m_flInnerRadius, FIELD_FLOAT, "inner_radius" ),

+

+	// Inputs

+	DEFINE_INPUTFUNC( FIELD_VOID, "Explode", InputExplode ),

+

+	// Outputs 

+	DEFINE_OUTPUT( m_OnPushedPlayer, "OnPushedPlayer" ),

+

+END_DATADESC()

+

+

+void CPhysExplosion::Spawn( void )

+{

+	SetMoveType( MOVETYPE_NONE );

+	SetSolid( SOLID_NONE );

+	SetModelName( NULL_STRING );

+}

+

+float CPhysExplosion::GetRadius( void )

+{

+	float radius = m_radius;

+	if ( radius <= 0 )

+	{

+		// Use the same radius as combat

+		radius = m_damage * 2.5;

+	}

+

+	return radius;

+}

+

+CBaseEntity *CPhysExplosion::FindEntity( CBaseEntity *pEntity, CBaseEntity *pActivator, CBaseEntity *pCaller )

+{

+	// Filter by name or classname

+	if ( m_targetEntityName != NULL_STRING )

+	{

+		// Try an explicit name first

+		CBaseEntity *pTarget = gEntList.FindEntityByName( pEntity, m_targetEntityName, NULL, pActivator, pCaller );

+		if ( pTarget != NULL )

+			return pTarget;

+

+		// Failing that, try a classname

+		return gEntList.FindEntityByClassnameWithin( pEntity, STRING(m_targetEntityName), GetAbsOrigin(), GetRadius() );

+	}

+

+	// Just find anything in the radius

+	return gEntList.FindEntityInSphere( pEntity, GetAbsOrigin(), GetRadius() );

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysExplosion::InputExplode( inputdata_t &inputdata )

+{

+	Explode( inputdata.pActivator, inputdata.pCaller );

+}

+

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysExplosion::Explode( CBaseEntity *pActivator, CBaseEntity *pCaller )

+{

+	CBaseEntity *pEntity = NULL;

+	float		adjustedDamage, falloff, flDist;

+	Vector		vecSpot, vecOrigin;

+

+	falloff = 1.0 / 2.5;

+

+	// iterate on all entities in the vicinity.

+	// I've removed the traceline heuristic from phys explosions. SO right now they will

+	// affect entities through walls. (sjb)

+	// UNDONE: Try tracing world-only?

+	while ((pEntity = FindEntity( pEntity, pActivator, pCaller )) != NULL)

+	{

+		// UNDONE: Ask the object if it should get force if it's not MOVETYPE_VPHYSICS?

+		if ( pEntity->m_takedamage != DAMAGE_NO && (pEntity->GetMoveType() == MOVETYPE_VPHYSICS || (pEntity->VPhysicsGetObject() /*&& !pEntity->IsPlayer()*/)) )

+		{

+			vecOrigin = GetAbsOrigin();

+			

+			vecSpot = pEntity->BodyTarget( vecOrigin );

+			// Squash this down to a circle

+			if ( HasSpawnFlags( SF_PHYSEXPLOSION_RADIAL ) )

+			{

+				vecOrigin[2] = vecSpot[2];

+			}

+			

+			// decrease damage for an ent that's farther from the bomb.

+			flDist = ( vecOrigin - vecSpot ).Length();

+

+			if( m_radius == 0 || flDist <= m_radius )

+			{

+				if ( HasSpawnFlags( SF_PHYSEXPLOSION_TEST_LOS ) )

+				{

+					Vector vecStartPos = GetAbsOrigin();

+					Vector vecEndPos = pEntity->BodyTarget( vecStartPos, false );

+

+					if ( m_flInnerRadius != 0.0f )

+					{

+						// Find a point on our inner radius sphere to begin from

+						Vector vecDirToTarget = ( vecEndPos - vecStartPos );

+						VectorNormalize( vecDirToTarget );

+						vecStartPos = GetAbsOrigin() + ( vecDirToTarget * m_flInnerRadius );

+					}

+

+					trace_t tr;

+					UTIL_TraceLine( vecStartPos, 

+						pEntity->BodyTarget( vecStartPos, false ), 

+						MASK_SOLID_BRUSHONLY, 

+						this, 

+						COLLISION_GROUP_NONE, 

+						&tr );

+

+					// Shielded

+					if ( tr.fraction < 1.0f && tr.m_pEnt != pEntity )

+						continue;

+				}

+

+				adjustedDamage =  flDist * falloff;

+				adjustedDamage = m_damage - adjustedDamage;

+		

+				if ( adjustedDamage < 1 )

+				{

+					adjustedDamage = 1;

+				}

+

+				CTakeDamageInfo info( this, this, adjustedDamage, DMG_BLAST );

+				CalculateExplosiveDamageForce( &info, (vecSpot - vecOrigin), vecOrigin );

+	

+				if ( HasSpawnFlags( SF_PHYSEXPLOSION_PUSH_PLAYER ) )

+				{

+					if ( pEntity->IsPlayer() )

+					{

+						Vector vecPushDir = ( pEntity->BodyTarget( GetAbsOrigin(), false ) - GetAbsOrigin() );

+						float dist = VectorNormalize( vecPushDir );

+

+						float flFalloff = RemapValClamped( dist, m_radius, m_radius*0.75f, 0.0f, 1.0f );

+

+						if ( HasSpawnFlags( SF_PHYSEXPLOSION_DISORIENT_PLAYER ) )

+						{

+							//Disorient the player

+							QAngle vecDeltaAngles;

+

+							vecDeltaAngles.x = random->RandomInt( -30, 30 );

+							vecDeltaAngles.y = random->RandomInt( -30, 30 );

+							vecDeltaAngles.z = 0.0f;

+

+							CBasePlayer *pPlayer = ToBasePlayer( pEntity );

+							pPlayer->SnapEyeAngles( GetLocalAngles() + vecDeltaAngles );

+							pEntity->ViewPunch( vecDeltaAngles );

+						}

+

+						Vector vecPush = (vecPushDir*m_damage*flFalloff*2.0f);

+						if ( pEntity->GetFlags() & FL_BASEVELOCITY )

+						{

+							vecPush = vecPush + pEntity->GetBaseVelocity();

+						}

+						if ( vecPush.z > 0 && (pEntity->GetFlags() & FL_ONGROUND) )

+						{

+							pEntity->SetGroundEntity( NULL );

+							Vector origin = pEntity->GetAbsOrigin();

+							origin.z += 1.0f;

+							pEntity->SetAbsOrigin( origin );

+						}

+

+						pEntity->SetBaseVelocity( vecPush );

+						pEntity->AddFlag( FL_BASEVELOCITY );

+

+						// Fire an output that the player has been pushed

+						m_OnPushedPlayer.FireOutput( this, this );

+						continue;

+					}

+				}

+	

+				if ( HasSpawnFlags( SF_PHYSEXPLOSION_NODAMAGE ) )

+				{

+					pEntity->VPhysicsTakeDamage( info );

+				}

+				else

+				{

+					pEntity->TakeDamage( info );

+				}

+			}

+		}

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Draw any debug text overlays

+// Output : Current text offset from the top

+//-----------------------------------------------------------------------------

+int CPhysExplosion::DrawDebugTextOverlays( void ) 

+{

+	int text_offset = BaseClass::DrawDebugTextOverlays();

+

+	if (m_debugOverlays & OVERLAY_TEXT_BIT) 

+	{

+		char tempstr[512];

+

+		// print magnitude

+		Q_snprintf(tempstr,sizeof(tempstr),"    magnitude: %f", m_damage);

+		EntityText(text_offset,tempstr,0);

+		text_offset++;

+

+		// print target entity

+		Q_snprintf(tempstr,sizeof(tempstr),"    limit to: %s", STRING(m_targetEntityName));

+		EntityText(text_offset,tempstr,0);

+		text_offset++;

+	}

+	return text_offset;

+}

+

+

+//==================================================

+// CPhysImpact

+//==================================================

+

+#define	bitsPHYSIMPACT_NOFALLOFF		0x00000001

+#define	bitsPHYSIMPACT_INFINITE_LENGTH	0x00000002

+#define	bitsPHYSIMPACT_IGNORE_MASS		0x00000004

+#define bitsPHYSIMPACT_IGNORE_NORMAL	0x00000008

+

+#define	DEFAULT_EXPLODE_DISTANCE	256

+LINK_ENTITY_TO_CLASS( env_physimpact, CPhysImpact );

+

+BEGIN_DATADESC( CPhysImpact )

+

+	DEFINE_KEYFIELD( m_damage,				FIELD_FLOAT,	"magnitude" ),

+	DEFINE_KEYFIELD( m_distance,			FIELD_FLOAT,	"distance" ),

+	DEFINE_KEYFIELD( m_directionEntityName,FIELD_STRING,	"directionentityname" ),

+

+	// Function pointers

+	DEFINE_FUNCTION( PointAtEntity ),

+

+	DEFINE_INPUTFUNC( FIELD_VOID, "Impact", InputImpact ),

+

+END_DATADESC()

+

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysImpact::Activate( void )

+{

+	BaseClass::Activate();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysImpact::Spawn( void )

+{

+	SetMoveType( MOVETYPE_NONE );

+	SetSolid( SOLID_NONE );

+	SetModelName( NULL_STRING );

+

+	//If not targetted, and no distance is set, give it a default value

+	if ( m_distance == 0 )

+	{

+		m_distance = DEFAULT_EXPLODE_DISTANCE;

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysImpact::PointAtEntity( void )

+{

+	//If we're not targetted at anything, don't bother

+	if ( m_directionEntityName == NULL_STRING )

+		return;

+

+	UTIL_PointAtNamedEntity( this, m_directionEntityName );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+// Input  : *pActivator - 

+//			*pCaller - 

+//			useType - 

+//			value - 

+//-----------------------------------------------------------------------------

+void CPhysImpact::InputImpact( inputdata_t &inputdata )

+{

+	Vector	dir;

+	trace_t	trace;

+

+	//If we have a direction target, setup to point at it

+	if ( m_directionEntityName != NULL_STRING )

+	{

+		PointAtEntity();

+	}

+

+	AngleVectors( GetAbsAngles(), &dir );

+	

+	//Setup our trace information

+	float	dist	= HasSpawnFlags( bitsPHYSIMPACT_INFINITE_LENGTH ) ? MAX_TRACE_LENGTH : m_distance;

+	Vector	start	= GetAbsOrigin();

+	Vector	end		= start + ( dir * dist );

+

+	//Trace out

+	UTIL_TraceLine( start, end, MASK_SHOT, this, COLLISION_GROUP_NONE, &trace );

+	if ( trace.startsolid )

+	{

+		// ep1_citadel_04 has a phys_impact just behind another entity, so if we startsolid then

+		// bump out just a little and retry the trace

+		Vector startOffset = start +  ( dir * 0.1 );

+		UTIL_TraceLine( startOffset , end, MASK_SHOT, this, COLLISION_GROUP_NONE, &trace );

+	}

+

+	if( debug_physimpact.GetBool() )

+	{

+		NDebugOverlay::Cross3D( start, 24, 255, 255, 255, false, 30 );

+		NDebugOverlay::Line( trace.startpos, trace.endpos, 0, 255, 0, false, 30 );

+	}

+

+	if ( trace.fraction != 1.0 )

+	{

+		// if inside the object, just go opposite the direction

+		if ( trace.startsolid )

+		{

+			trace.plane.normal = -dir;

+		}

+		CBaseEntity	*pEnt = trace.m_pEnt;

+	

+		IPhysicsObject *pPhysics = pEnt->VPhysicsGetObject();

+		//If the entity is valid, hit it

+		if ( ( pEnt != NULL  ) && ( pPhysics != NULL ) )

+		{

+			CTakeDamageInfo info;

+			info.SetAttacker( this);

+			info.SetInflictor( this );

+			info.SetDamage( 0 );

+			info.SetDamageForce( vec3_origin );

+			info.SetDamageType( DMG_GENERIC );

+

+			pEnt->DispatchTraceAttack( info, dir, &trace );

+			ApplyMultiDamage();

+

+			//Damage falls off unless specified or the ray's length is infinite

+			float	damage = HasSpawnFlags( bitsPHYSIMPACT_NOFALLOFF | bitsPHYSIMPACT_INFINITE_LENGTH ) ? 

+								m_damage : (m_damage * (1.0f-trace.fraction));

+			

+			if ( HasSpawnFlags( bitsPHYSIMPACT_IGNORE_MASS ) )

+			{

+				damage *= pPhysics->GetMass();

+			}

+

+			if( debug_physimpact.GetBool() )

+			{

+				NDebugOverlay::Line( trace.endpos, trace.endpos + trace.plane.normal * -128, 255, 0, 0, false, 30 );

+			}

+

+			// Legacy entities applied the force along the impact normal, which yielded unpredictable results.

+			if ( !HasSpawnFlags( bitsPHYSIMPACT_IGNORE_NORMAL ) )

+			{

+				dir = -trace.plane.normal;

+			}				

+

+			pPhysics->ApplyForceOffset( damage * dir * phys_pushscale.GetFloat(), trace.endpos );

+		}

+	}

+}

+

+

+class CSimplePhysicsBrush : public CBaseEntity

+{

+	DECLARE_CLASS( CSimplePhysicsBrush, CBaseEntity );

+public:

+	void Spawn()

+	{

+		SetModel( STRING( GetModelName() ) );

+		SetMoveType( MOVETYPE_VPHYSICS );

+		SetSolid( SOLID_VPHYSICS );

+		m_takedamage = DAMAGE_EVENTS_ONLY;

+	}

+};

+

+LINK_ENTITY_TO_CLASS( simple_physics_brush, CSimplePhysicsBrush );

+

+class CSimplePhysicsProp : public CBaseProp

+{

+	DECLARE_CLASS( CSimplePhysicsProp, CBaseProp );

+

+public:

+	void Spawn()

+	{

+		BaseClass::Spawn();

+		SetMoveType( MOVETYPE_VPHYSICS );

+		SetSolid( SOLID_VPHYSICS );

+		m_takedamage = DAMAGE_EVENTS_ONLY;

+	}

+

+	int ObjectCaps()

+	{ 

+		int caps = BaseClass::ObjectCaps() | FCAP_WCEDIT_POSITION;

+

+		if ( CBasePlayer::CanPickupObject( this, 35, 128 ) )

+		{

+			caps |= FCAP_IMPULSE_USE;

+		}

+

+		return caps;

+	}

+

+	void Use( CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value )

+	{

+		CBasePlayer *pPlayer = ToBasePlayer( pActivator );

+		if ( pPlayer )

+		{

+			pPlayer->PickupObject( this );

+		}

+	}

+};

+

+LINK_ENTITY_TO_CLASS( simple_physics_prop, CSimplePhysicsProp );

+

+// UNDONE: Is this worth it?, just recreate the object instead? (that happens when this returns false anyway)

+// recreating works, but is more expensive and won't inherit properties (velocity, constraints, etc)

+bool TransferPhysicsObject( CBaseEntity *pFrom, CBaseEntity *pTo, bool wakeUp )

+{

+	IPhysicsObject *pVPhysics = pFrom->VPhysicsGetObject();

+	if ( !pVPhysics || pVPhysics->IsStatic() )

+		return false;

+

+	// clear out the pointer so it won't get deleted

+	pFrom->VPhysicsSwapObject( NULL );

+	// remove any AI behavior bound to it

+	pVPhysics->RemoveShadowController();

+	// transfer to the new owner

+	pTo->VPhysicsSetObject( pVPhysics );

+	pVPhysics->SetGameData( (void *)pTo );

+	pTo->VPhysicsUpdate( pVPhysics );

+	

+	// may have been temporarily disabled by the old object

+	pVPhysics->EnableMotion( true );

+	pVPhysics->EnableGravity( true );

+	

+	// Update for the new entity solid type

+	pVPhysics->RecheckCollisionFilter();

+	if ( wakeUp )

+	{

+		pVPhysics->Wake();

+	}

+

+	return true;

+}

+

+// UNDONE: Move/rename this function

+static CBaseEntity *CreateSimplePhysicsObject( CBaseEntity *pEntity, bool createAsleep, bool createAsDebris )

+{

+	CBaseEntity *pPhysEntity = NULL;

+	int modelindex = pEntity->GetModelIndex();

+	const model_t *model = modelinfo->GetModel( modelindex );

+	if ( model && modelinfo->GetModelType(model) == mod_brush )

+	{

+		pPhysEntity = CreateEntityByName( "simple_physics_brush" );

+	}

+	else

+	{

+		pPhysEntity = CreateEntityByName( "simple_physics_prop" );

+	}

+

+	pPhysEntity->KeyValue( "model", STRING(pEntity->GetModelName()) );

+	pPhysEntity->SetAbsOrigin( pEntity->GetAbsOrigin() );

+	pPhysEntity->SetAbsAngles( pEntity->GetAbsAngles() );

+	pPhysEntity->Spawn();

+	if ( !TransferPhysicsObject( pEntity, pPhysEntity, !createAsleep ) )

+	{

+		pPhysEntity->VPhysicsInitNormal( SOLID_VPHYSICS, 0, createAsleep );

+		if ( createAsDebris )

+			pPhysEntity->SetCollisionGroup( COLLISION_GROUP_DEBRIS );

+	}

+	return pPhysEntity;

+}

+

+#define SF_CONVERT_ASLEEP		0x0001

+#define SF_CONVERT_AS_DEBRIS	0x0002

+

+class CPhysConvert : public CLogicalEntity

+{

+	DECLARE_CLASS( CPhysConvert, CLogicalEntity );

+

+public:

+	CPhysConvert( void ) : m_flMassOverride( 0.0f ) {};

+	COutputEvent m_OnConvert;	

+

+	// Input handlers

+	void InputConvertTarget( inputdata_t &inputdata );

+

+	DECLARE_DATADESC();

+

+private:

+	string_t		m_swapModel;

+	float			m_flMassOverride;

+};

+

+LINK_ENTITY_TO_CLASS( phys_convert, CPhysConvert );

+

+BEGIN_DATADESC( CPhysConvert )

+

+	DEFINE_KEYFIELD( m_swapModel,		FIELD_STRING,	"swapmodel" ),

+	DEFINE_KEYFIELD( m_flMassOverride,	FIELD_FLOAT,	"massoverride" ),

+	

+	// Inputs

+	DEFINE_INPUTFUNC( FIELD_VOID, "ConvertTarget", InputConvertTarget ),

+

+	// Outputs

+	DEFINE_OUTPUT( m_OnConvert, "OnConvert"),

+

+END_DATADESC()

+

+

+

+//-----------------------------------------------------------------------------

+// Purpose: Input handler that converts our target to a physics object.

+//-----------------------------------------------------------------------------

+void CPhysConvert::InputConvertTarget( inputdata_t &inputdata )

+{

+	bool createAsleep = HasSpawnFlags(SF_CONVERT_ASLEEP);

+	bool createAsDebris = HasSpawnFlags(SF_CONVERT_AS_DEBRIS);

+	// Fire output

+	m_OnConvert.FireOutput( inputdata.pActivator, this );

+

+	CBaseEntity *entlist[512];

+	CBaseEntity *pSwap = gEntList.FindEntityByName( NULL, m_swapModel, NULL, inputdata.pActivator, inputdata.pCaller );

+	CBaseEntity *pEntity = NULL;

+	

+	int count = 0;

+	while ( (pEntity = gEntList.FindEntityByName( pEntity, m_target, NULL, inputdata.pActivator, inputdata.pCaller )) != NULL )

+	{

+		entlist[count++] = pEntity;

+		if ( count >= ARRAYSIZE(entlist) )

+			break;

+	}

+

+	// if we're swapping to model out, don't loop over more than one object

+	// multiple objects with the same brush model will render, but the dynamic lights

+	// and decals will be shared between the two instances...

+	if ( pSwap && count > 0 )

+	{

+		count = 1;

+	}

+

+	for ( int i = 0; i < count; i++ )

+	{

+		pEntity = entlist[i];

+

+		// don't convert something that is already physics based

+		if ( pEntity->GetMoveType() == MOVETYPE_VPHYSICS )

+		{

+			Msg( "ERROR phys_convert %s ! Already MOVETYPE_VPHYSICS\n", STRING(pEntity->m_iClassname) );

+			continue;

+		}

+

+		UnlinkFromParent( pEntity );

+

+		if ( pSwap )

+		{

+			// we can't reuse this physics object, so kill it

+			pEntity->VPhysicsDestroyObject();

+			pEntity->SetModel( STRING(pSwap->GetModelName()) );

+		}

+

+		// created phys object, now move hierarchy over

+		CBaseEntity *pPhys = CreateSimplePhysicsObject( pEntity, createAsleep, createAsDebris );

+		if ( pPhys )

+		{

+			// Override the mass if specified

+			if ( m_flMassOverride > 0 )

+			{

+				IPhysicsObject *pPhysObj = pPhys->VPhysicsGetObject();

+				if ( pPhysObj )

+				{

+					pPhysObj->SetMass( m_flMassOverride );

+				}

+			}

+

+			pPhys->SetName( pEntity->GetEntityName() );

+			UTIL_TransferPoseParameters( pEntity, pPhys );

+			TransferChildren( pEntity, pPhys );

+			pEntity->AddSolidFlags( FSOLID_NOT_SOLID );

+			pEntity->AddEffects( EF_NODRAW );

+			UTIL_Remove( pEntity );

+		}

+	}

+}

+

+//============================================================================================================

+// PHYS MAGNET

+//============================================================================================================

+#define SF_MAGNET_ASLEEP			0x0001

+#define SF_MAGNET_MOTIONDISABLED	0x0002

+#define SF_MAGNET_SUCK				0x0004

+#define SF_MAGNET_ALLOWROTATION		0x0008

+#define SF_MAGNET_COAST_HACK		0x0010

+

+LINK_ENTITY_TO_CLASS( phys_magnet, CPhysMagnet );

+

+// BUGBUG: This won't work!  Right now you can't save physics pointers inside an embedded type!

+BEGIN_SIMPLE_DATADESC( magnetted_objects_t )

+

+	DEFINE_PHYSPTR( pConstraint ),

+	DEFINE_FIELD( hEntity,	FIELD_EHANDLE	),

+

+END_DATADESC()

+

+BEGIN_DATADESC( CPhysMagnet )

+	// Outputs

+	DEFINE_OUTPUT( m_OnMagnetAttach, "OnAttach" ),

+	DEFINE_OUTPUT( m_OnMagnetDetach, "OnDetach" ),

+

+	// Keys

+	DEFINE_KEYFIELD( m_massScale, FIELD_FLOAT, "massScale" ),

+	DEFINE_KEYFIELD( m_iszOverrideScript, FIELD_STRING, "overridescript" ),

+	DEFINE_KEYFIELD( m_iMaxObjectsAttached, FIELD_INTEGER, "maxobjects" ),

+	DEFINE_KEYFIELD( m_forceLimit, FIELD_FLOAT, "forcelimit" ),

+	DEFINE_KEYFIELD( m_torqueLimit, FIELD_FLOAT, "torquelimit" ),

+

+	DEFINE_UTLVECTOR( m_MagnettedEntities, FIELD_EMBEDDED ),

+	DEFINE_PHYSPTR( m_pConstraintGroup ),

+

+	DEFINE_FIELD( m_bActive, FIELD_BOOLEAN ),

+	DEFINE_FIELD( m_bHasHitSomething, FIELD_BOOLEAN ),

+	DEFINE_FIELD( m_flTotalMass, FIELD_FLOAT ),

+	DEFINE_FIELD( m_flRadius, FIELD_FLOAT ),

+	DEFINE_FIELD( m_flNextSuckTime, FIELD_FLOAT ),

+

+	// Inputs

+	DEFINE_INPUTFUNC( FIELD_VOID, "Toggle", InputToggle ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "TurnOn", InputTurnOn ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "TurnOff", InputTurnOff ),

+

+END_DATADESC()

+

+//-----------------------------------------------------------------------------

+// Purpose: SendProxy that converts the magnet's attached object UtlVector to entindexes

+//-----------------------------------------------------------------------------

+void SendProxy_MagnetAttachedObjectList( const void *pStruct, const void *pData, DVariant *pOut, int iElement, int objectID )

+{

+	CPhysMagnet *pMagnet = (CPhysMagnet*)pData;

+

+	// If this assertion fails, then SendProxyArrayLength_MagnetAttachedArray must have failed.

+	Assert( iElement < pMagnet->GetNumAttachedObjects() );

+

+	pOut->m_Int = pMagnet->GetAttachedObject(iElement)->entindex();

+}

+

+

+int SendProxyArrayLength_MagnetAttachedArray( const void *pStruct, int objectID )

+{

+	CPhysMagnet *pMagnet = (CPhysMagnet*)pStruct;

+	return pMagnet->GetNumAttachedObjects();

+}

+

+IMPLEMENT_SERVERCLASS_ST( CPhysMagnet, DT_PhysMagnet )

+

+	// ROBIN: Disabled because we don't need it anymore

+	/*

+	SendPropArray2( 

+		SendProxyArrayLength_MagnetAttachedArray,

+		SendPropInt("magnetattached_array_element", 0, 4, 10, SPROP_UNSIGNED, SendProxy_MagnetAttachedObjectList), 

+		128, 

+		0, 

+		"magnetattached_array"

+		)

+	*/

+

+END_SEND_TABLE()

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+CPhysMagnet::CPhysMagnet( void )

+{

+	m_forceLimit = 0;

+	m_torqueLimit = 0;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+CPhysMagnet::~CPhysMagnet( void )

+{

+	DetachAll();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysMagnet::Spawn( void )

+{

+	Precache();

+

+	SetMoveType( MOVETYPE_NONE );

+	SetSolid( SOLID_VPHYSICS );

+	SetModel( STRING( GetModelName() ) );

+

+	m_takedamage = DAMAGE_EVENTS_ONLY;

+

+	solid_t tmpSolid;

+	PhysModelParseSolid( tmpSolid, this, GetModelIndex() );

+	if ( m_massScale > 0 )

+	{

+		tmpSolid.params.mass *= m_massScale;

+	}

+	PhysSolidOverride( tmpSolid, m_iszOverrideScript );

+	VPhysicsInitNormal( GetSolid(), GetSolidFlags(), true, &tmpSolid );

+

+	// Wake it up if not asleep

+	if ( !HasSpawnFlags(SF_MAGNET_ASLEEP) )

+	{

+		VPhysicsGetObject()->Wake();

+	}

+

+	if ( HasSpawnFlags(SF_MAGNET_MOTIONDISABLED) )

+	{

+		VPhysicsGetObject()->EnableMotion( false );

+	}

+

+	m_bActive = true;

+	m_pConstraintGroup = NULL;

+	m_flTotalMass = 0;

+	m_flNextSuckTime = 0;

+

+	BaseClass::Spawn();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysMagnet::Precache( void )

+{

+	PrecacheModel( STRING( GetModelName() ) );

+	BaseClass::Precache();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysMagnet::Touch( CBaseEntity *pOther )

+{

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysMagnet::VPhysicsCollision( int index, gamevcollisionevent_t *pEvent )

+{

+	int otherIndex = !index;

+	CBaseEntity *pOther = pEvent->pEntities[otherIndex];

+

+	// Ignore triggers

+	if ( pOther->IsSolidFlagSet( FSOLID_NOT_SOLID ) )

+		return;

+

+	m_bHasHitSomething = true;

+	DoMagnetSuck( pEvent->pEntities[!index] );

+

+	// Don't pickup if we're not active

+	if ( !m_bActive )

+		return;

+

+	// Hit our maximum?

+	if ( m_iMaxObjectsAttached && m_iMaxObjectsAttached <= GetNumAttachedObjects() )

+		return;

+

+	// This is a hack to solve players (Erik) stacking stuff on their jeeps in coast_01 

+	// and being screwed when the crane can't pick them up. We need to get rid of the object.

+	if ( HasSpawnFlags( SF_MAGNET_COAST_HACK ) )

+	{

+		// If the other isn't the jeep, we need to get rid of it

+		if ( !FClassnameIs( pOther, "prop_vehicle_jeep" ) )

+		{

+			// If it takes damage, destroy it

+			if ( pOther->m_takedamage != DAMAGE_NO && pOther->m_takedamage != DAMAGE_EVENTS_ONLY )

+			{

+				CTakeDamageInfo info( this, this, pOther->GetHealth(), DMG_GENERIC | DMG_PREVENT_PHYSICS_FORCE );

+				pOther->TakeDamage( info );

+			}

+			else if ( pEvent->pObjects[ otherIndex ]->IsMoveable() )

+			{

+				// Otherwise, we're screwed, so just remove it

+				UTIL_Remove( pOther );

+			}

+			else

+			{

+				Warning( "CPhysMagnet %s:%d blocking magnet\n",

+					pOther->GetClassname(), pOther->entindex() );

+			}

+			return;

+		}

+	}

+

+	// Make sure it's made of metal

+	const surfacedata_t *phit = physprops->GetSurfaceData( pEvent->surfaceProps[otherIndex] );

+	char cTexType = phit->game.material;

+	if ( cTexType != CHAR_TEX_METAL && cTexType != CHAR_TEX_COMPUTER )

+	{

+		// If we don't have a model, we're done. The texture we hit wasn't metal.

+		if ( !pOther->GetBaseAnimating() )

+			return;

+

+		// If we have a model that wants to be metal, even though we hit a non-metal texture, we'll stick to it

+		if ( Q_strncmp( Studio_GetDefaultSurfaceProps( pOther->GetBaseAnimating()->GetModelPtr() ), "metal", 5 ) )

+			return;

+	}

+

+	IPhysicsObject *pPhysics = pOther->VPhysicsGetObject();

+	if ( pPhysics && pOther->GetMoveType() == MOVETYPE_VPHYSICS && pPhysics->IsMoveable() )

+	{

+		// Make sure we haven't already got this sucker on the magnet

+		int iCount = m_MagnettedEntities.Count();

+		for ( int i = 0; i < iCount; i++ )

+		{

+			if ( m_MagnettedEntities[i].hEntity == pOther )

+				return;

+		}

+

+		// We want to cast a long way to ensure our shadow shows up

+		pOther->SetShadowCastDistance( 2048 );

+

+		// Create a constraint between the magnet and this sucker

+		IPhysicsObject *pMagnetPhysObject = VPhysicsGetObject();

+		Assert( pMagnetPhysObject );

+

+		magnetted_objects_t newEntityOnMagnet;

+		newEntityOnMagnet.hEntity = pOther;

+

+		// Use the right constraint

+		if ( HasSpawnFlags( SF_MAGNET_ALLOWROTATION ) )

+		{

+			constraint_ballsocketparams_t ballsocket;

+			ballsocket.Defaults();

+			ballsocket.constraint.Defaults();

+			ballsocket.constraint.forceLimit = lbs2kg(m_forceLimit);

+			ballsocket.constraint.torqueLimit = lbs2kg(m_torqueLimit);

+

+			Vector vecCollisionPoint;

+			pEvent->pInternalData->GetContactPoint( vecCollisionPoint );

+

+			pMagnetPhysObject->WorldToLocal( &ballsocket.constraintPosition[0], vecCollisionPoint );

+			pPhysics->WorldToLocal( &ballsocket.constraintPosition[1], vecCollisionPoint );

+

+			//newEntityOnMagnet.pConstraint = physenv->CreateBallsocketConstraint( pMagnetPhysObject, pPhysics, m_pConstraintGroup, ballsocket );

+			newEntityOnMagnet.pConstraint = physenv->CreateBallsocketConstraint( pMagnetPhysObject, pPhysics, NULL, ballsocket );

+		}

+		else

+		{

+			constraint_fixedparams_t fixed;

+			fixed.Defaults();

+			fixed.InitWithCurrentObjectState( pMagnetPhysObject, pPhysics );

+			fixed.constraint.Defaults();

+			fixed.constraint.forceLimit = lbs2kg(m_forceLimit);

+			fixed.constraint.torqueLimit = lbs2kg(m_torqueLimit);

+

+			// FIXME: Use the magnet's constraint group.

+			//newEntityOnMagnet.pConstraint = physenv->CreateFixedConstraint( pMagnetPhysObject, pPhysics, m_pConstraintGroup, fixed );

+			newEntityOnMagnet.pConstraint = physenv->CreateFixedConstraint( pMagnetPhysObject, pPhysics, NULL, fixed );

+		}

+

+		newEntityOnMagnet.pConstraint->SetGameData( (void *) this );

+		m_MagnettedEntities.AddToTail( newEntityOnMagnet );

+

+		m_flTotalMass += pPhysics->GetMass();

+	}

+

+	DoMagnetSuck( pOther );

+

+	m_OnMagnetAttach.FireOutput( this, this );

+

+	BaseClass::VPhysicsCollision( index, pEvent );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysMagnet::DoMagnetSuck( CBaseEntity *pOther )

+{

+	if ( !HasSpawnFlags( SF_MAGNET_SUCK ) )

+		return;

+

+	if ( !m_bActive )

+		return;

+

+	// Don't repeatedly suck

+	if ( m_flNextSuckTime > gpGlobals->curtime )

+		return;

+	

+	// Look for physics objects underneath the magnet and suck them onto it

+	Vector vecCheckPos, vecSuckPoint;

+	VectorTransform( Vector(0,0,-96), EntityToWorldTransform(), vecCheckPos );

+	VectorTransform( Vector(0,0,-64), EntityToWorldTransform(), vecSuckPoint );

+

+	CBaseEntity *pEntities[20];

+	int iNumEntities = UTIL_EntitiesInSphere( pEntities, 20, vecCheckPos, 80.0, 0 );

+	for ( int i = 0; i < iNumEntities; i++ )

+	{

+		CBaseEntity *pEntity = pEntities[i];

+		if ( !pEntity || pEntity == pOther )

+			continue;

+

+		IPhysicsObject *pPhys = pEntity->VPhysicsGetObject();

+		if ( pPhys && pEntity->GetMoveType() == MOVETYPE_VPHYSICS && pPhys->GetMass() < 5000 )

+		{

+			// Do we have line of sight to it?

+			trace_t tr;

+			UTIL_TraceLine( GetAbsOrigin(), pEntity->GetAbsOrigin(), MASK_SHOT, this, 0, &tr );

+			if ( tr.fraction == 1.0 || tr.m_pEnt == pEntity )

+			{

+				// Pull it towards the magnet

+				Vector vecVelocity = (vecSuckPoint - pEntity->GetAbsOrigin());

+				VectorNormalize(vecVelocity);

+				vecVelocity *= 5 * pPhys->GetMass();

+				pPhys->AddVelocity( &vecVelocity, NULL );

+			}

+		}

+	}

+

+	m_flNextSuckTime = gpGlobals->curtime + 2.0;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysMagnet::SetConstraintGroup( IPhysicsConstraintGroup *pGroup )

+{

+	m_pConstraintGroup = pGroup;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Make the magnet active

+//-----------------------------------------------------------------------------

+void CPhysMagnet::InputTurnOn( inputdata_t &inputdata )

+{

+	m_bActive = true;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Make the magnet inactive. Drop everything it's got hooked on.

+//-----------------------------------------------------------------------------

+void CPhysMagnet::InputTurnOff( inputdata_t &inputdata )

+{

+	m_bActive = false;

+	DetachAll();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: Toggle the magnet's active state

+//-----------------------------------------------------------------------------

+void CPhysMagnet::InputToggle( inputdata_t &inputdata )

+{

+	if ( m_bActive )

+	{

+		InputTurnOff( inputdata );

+	}

+	else

+	{

+		InputTurnOn( inputdata );

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: One of our magnet constraints broke

+//-----------------------------------------------------------------------------

+void CPhysMagnet::ConstraintBroken( IPhysicsConstraint *pConstraint )

+{

+	// Find the entity that was constrained and release it

+	int iCount = m_MagnettedEntities.Count();

+	for ( int i = 0; i < iCount; i++ )

+	{

+		if ( m_MagnettedEntities[i].hEntity.Get() != NULL && m_MagnettedEntities[i].pConstraint == pConstraint )

+		{

+			IPhysicsObject *pPhysObject = m_MagnettedEntities[i].hEntity->VPhysicsGetObject();

+

+			if( pPhysObject != NULL )

+			{

+				m_flTotalMass -= pPhysObject->GetMass();

+			}

+

+			m_MagnettedEntities.Remove(i);

+			break;

+		}

+	}

+

+	m_OnMagnetDetach.FireOutput( this, this );

+

+	physenv->DestroyConstraint( pConstraint  );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPhysMagnet::DetachAll( void )

+{

+	// Make sure we haven't already got this sucker on the magnet

+	int iCount = m_MagnettedEntities.Count();

+	for ( int i = 0; i < iCount; i++ )

+	{

+		// Delay a couple seconds to reset to the default shadow cast behavior

+		if ( m_MagnettedEntities[i].hEntity )

+		{

+			m_MagnettedEntities[i].hEntity->SetShadowCastDistance( 0, 2.0f );

+		}

+

+		physenv->DestroyConstraint( m_MagnettedEntities[i].pConstraint  );

+	}

+

+	m_MagnettedEntities.Purge();

+	m_flTotalMass = 0;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+int CPhysMagnet::GetNumAttachedObjects( void )

+{

+	return m_MagnettedEntities.Count();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+float CPhysMagnet::GetTotalMassAttachedObjects( void )

+{

+	return m_flTotalMass;

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+CBaseEntity *CPhysMagnet::GetAttachedObject( int iIndex )

+{

+	Assert( iIndex < GetNumAttachedObjects() );

+

+	return m_MagnettedEntities[iIndex].hEntity;

+}

+

+class CInfoMassCenter : public CPointEntity

+{

+	DECLARE_CLASS( CInfoMassCenter, CPointEntity );

+public:

+	void Spawn( void )

+	{

+		if ( m_target != NULL_STRING )

+		{

+			masscenteroverride_t params;

+			params.SnapToPoint( m_target, GetAbsOrigin() );

+			PhysSetMassCenterOverride( params );

+			UTIL_Remove( this );

+		}

+	}

+};

+LINK_ENTITY_TO_CLASS( info_mass_center, CInfoMassCenter );

+

+// =============================================================

+// point_push

+// =============================================================

+

+class CPointPush : public CPointEntity

+{

+public:

+	DECLARE_CLASS( CPointPush, CPointEntity );

+

+	virtual void Activate( void );

+	void PushThink( void );

+	

+	void	InputEnable( inputdata_t &inputdata );

+	void	InputDisable( inputdata_t &inputdata );

+

+	DECLARE_DATADESC();

+

+private:

+	inline void PushEntity( CBaseEntity *pTarget );

+

+	bool	m_bEnabled;

+	float	m_flMagnitude;

+	float	m_flRadius;

+	float	m_flInnerRadius;	// Inner radius where the push eminates from (on a sphere)

+};

+

+LINK_ENTITY_TO_CLASS( point_push, CPointPush );

+

+BEGIN_DATADESC( CPointPush )

+

+	DEFINE_THINKFUNC( PushThink ),

+	

+	DEFINE_KEYFIELD( m_bEnabled,	FIELD_BOOLEAN,	"enabled" ),

+	DEFINE_KEYFIELD( m_flMagnitude, FIELD_FLOAT,	"magnitude" ),

+	DEFINE_KEYFIELD( m_flRadius,	FIELD_FLOAT,	"radius" ),

+	DEFINE_KEYFIELD( m_flInnerRadius,FIELD_FLOAT,	"inner_radius" ),

+

+	DEFINE_INPUTFUNC( FIELD_VOID, "Enable", InputEnable ),

+	DEFINE_INPUTFUNC( FIELD_VOID, "Disable", InputDisable ),

+

+END_DATADESC();

+

+// Spawnflags

+#define	SF_PUSH_TEST_LOS			0x0001

+#define SF_PUSH_DIRECTIONAL			0x0002

+#define SF_PUSH_NO_FALLOFF			0x0004

+#define	SF_PUSH_PLAYER				0x0008

+#define SF_PUSH_PHYSICS				0x0010

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPointPush::Activate( void )

+{

+	if ( m_bEnabled )

+	{

+		SetThink( &CPointPush::PushThink );

+		SetNextThink( gpGlobals->curtime + 0.05f );

+	}

+

+	BaseClass::Activate();

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+// Input  : *pTarget - 

+//-----------------------------------------------------------------------------

+void CPointPush::PushEntity( CBaseEntity *pTarget )

+{

+	Vector vecPushDir;

+	

+	if ( HasSpawnFlags( SF_PUSH_DIRECTIONAL ) )

+	{

+		GetVectors( &vecPushDir, NULL, NULL );

+	}

+	else

+	{

+		vecPushDir = ( pTarget->BodyTarget( GetAbsOrigin(), false ) - GetAbsOrigin() );

+	}

+

+	float dist = VectorNormalize( vecPushDir );

+	

+	float flFalloff = ( HasSpawnFlags( SF_PUSH_NO_FALLOFF ) ) ? 1.0f : RemapValClamped( dist, m_flRadius, m_flRadius*0.25f, 0.0f, 1.0f );

+	

+	switch( pTarget->GetMoveType() )

+	{

+	case MOVETYPE_NONE:

+	case MOVETYPE_PUSH:

+	case MOVETYPE_NOCLIP:

+		break;

+

+	case MOVETYPE_VPHYSICS:

+		{

+			IPhysicsObject *pPhys = pTarget->VPhysicsGetObject();

+			if ( pPhys )

+			{

+				// UNDONE: Assume the velocity is for a 100kg object, scale with mass

+				pPhys->ApplyForceCenter( m_flMagnitude * flFalloff * 100.0f * vecPushDir * pPhys->GetMass() * gpGlobals->frametime );

+				return;

+			}

+		}

+		break;

+

+	case MOVETYPE_STEP:

+		{

+			// NPCs cannot be lifted up properly, they need to move in 2D

+			vecPushDir.z = 0.0f;

+			

+			// NOTE: Falls through!

+		}

+

+	default:

+		{

+			Vector vecPush = (m_flMagnitude * vecPushDir * flFalloff);

+			if ( pTarget->GetFlags() & FL_BASEVELOCITY )

+			{

+				vecPush = vecPush + pTarget->GetBaseVelocity();

+			}

+			if ( vecPush.z > 0 && (pTarget->GetFlags() & FL_ONGROUND) )

+			{

+				pTarget->SetGroundEntity( NULL );

+				Vector origin = pTarget->GetAbsOrigin();

+				origin.z += 1.0f;

+				pTarget->SetAbsOrigin( origin );

+			}

+

+			pTarget->SetBaseVelocity( vecPush );

+			pTarget->AddFlag( FL_BASEVELOCITY );

+		}

+		break;

+	}

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPointPush::PushThink( void )

+{

+	// Get a collection of entities in a radius around us

+	CBaseEntity *pEnts[256];

+	int numEnts = UTIL_EntitiesInSphere( pEnts, 256, GetAbsOrigin(), m_flRadius, 0 );

+	for ( int i = 0; i < numEnts; i++ )

+	{

+		// Must be solid

+		if ( pEnts[i]->IsSolid() == false )

+			continue;

+

+		// Cannot be parented (only push parents)

+		if ( pEnts[i]->GetMoveParent() != NULL )

+			continue;

+

+		// Must be moveable

+		if ( pEnts[i]->GetMoveType() != MOVETYPE_VPHYSICS && 

+			 pEnts[i]->GetMoveType() != MOVETYPE_WALK && 

+			 pEnts[i]->GetMoveType() != MOVETYPE_STEP )

+			continue; 

+

+		// If we don't want to push players, don't

+		if ( pEnts[i]->IsPlayer() && HasSpawnFlags( SF_PUSH_PLAYER ) == false )

+			continue;

+

+		// If we don't want to push physics, don't

+		if ( pEnts[i]->GetMoveType() == MOVETYPE_VPHYSICS && HasSpawnFlags( SF_PUSH_PHYSICS ) == false )

+			continue;

+

+		// Test for LOS if asked to

+		if ( HasSpawnFlags( SF_PUSH_TEST_LOS ) )

+		{

+			Vector vecStartPos = GetAbsOrigin();

+			Vector vecEndPos = pEnts[i]->BodyTarget( vecStartPos, false );

+

+			if ( m_flInnerRadius != 0.0f )

+			{

+				// Find a point on our inner radius sphere to begin from

+				Vector vecDirToTarget = ( vecEndPos - vecStartPos );

+				VectorNormalize( vecDirToTarget );

+				vecStartPos = GetAbsOrigin() + ( vecDirToTarget * m_flInnerRadius );

+			}

+

+			trace_t tr;

+			UTIL_TraceLine( vecStartPos, 

+							pEnts[i]->BodyTarget( vecStartPos, false ), 

+							MASK_SOLID_BRUSHONLY, 

+							this, 

+							COLLISION_GROUP_NONE, 

+							&tr );

+

+			// Shielded

+			if ( tr.fraction < 1.0f && tr.m_pEnt != pEnts[i] )

+				continue;

+		}

+

+		// Push it along

+		PushEntity( pEnts[i] );

+	}

+

+	// Set us up for the next think

+	SetNextThink( gpGlobals->curtime + 0.05f );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPointPush::InputEnable( inputdata_t &inputdata )

+{

+	m_bEnabled = true;

+	SetThink( &CPointPush::PushThink );

+	SetNextThink( gpGlobals->curtime + 0.05f );

+}

+

+//-----------------------------------------------------------------------------

+// Purpose: 

+//-----------------------------------------------------------------------------

+void CPointPush::InputDisable( inputdata_t &inputdata )

+{

+	m_bEnabled = false;

+	SetThink( NULL );

+	SetNextThink( gpGlobals->curtime );

+}