1 files changed, 69 insertions, 0 deletions
diff --git a/mathlib/bumpvects.cpp b/mathlib/bumpvects.cpp
new file mode 100644
index 0000000..5edbe4d
--- /dev/null
+++ b/mathlib/bumpvects.cpp
@@ -0,0 +1,69 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#if !defined(_STATIC_LINKED) || defined(_SHARED_LIB)
+
+
+#ifdef QUIVER
+#include "r_local.h"
+#endif
+#include "mathlib/bumpvects.h"
+#include "mathlib/vector.h"
+#include <assert.h>
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// z is coming out of the face.
+
+void GetBumpNormals( const Vector& sVect, const Vector& tVect, const Vector& flatNormal, 
+					 const Vector& phongNormal, Vector bumpNormals[NUM_BUMP_VECTS] )
+{
+	Vector tmpNormal;
+	bool leftHanded;
+	int i;
+
+	assert( NUM_BUMP_VECTS == 3 );
+	
+	// Are we left or right handed?
+	CrossProduct( sVect, tVect, tmpNormal );
+	if( DotProduct( flatNormal, tmpNormal ) < 0.0f )
+	{
+		leftHanded = true;
+	}
+	else
+	{
+		leftHanded = false;
+	}
+
+	// Build a basis for the face around the phong normal
+	matrix3x4_t smoothBasis;
+	CrossProduct( phongNormal.Base(), sVect.Base(), smoothBasis[1] );
+	VectorNormalize( smoothBasis[1] );
+	CrossProduct( smoothBasis[1], phongNormal.Base(), smoothBasis[0] );
+	VectorNormalize( smoothBasis[0] );
+	VectorCopy( phongNormal.Base(), smoothBasis[2] );
+	
+	if( leftHanded )
+	{
+		VectorNegate( smoothBasis[1] );
+	}
+	
+	// move the g_localBumpBasis into world space to create bumpNormals
+	for( i = 0; i < 3; i++ )
+	{
+		VectorIRotate( g_localBumpBasis[i], smoothBasis, bumpNormals[i] );
+	}
+}
+
+#endif // !_STATIC_LINKED || _SHARED_LIB
+\ No newline at end of file