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diff --git a/public/movieobjects/dmeselection.h b/public/movieobjects/dmeselection.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// A class representing a subselection of something like a mesh
+//
+//=============================================================================
+
+#ifndef DMECOMPONENT_H
+#define DMECOMPONENT_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "datamodel/dmelement.h"
+
+
+//-----------------------------------------------------------------------------
+//
+//
+//
+//-----------------------------------------------------------------------------
+class CDmeComponent : public CDmElement
+{
+	DEFINE_ELEMENT( CDmeComponent, CDmElement );
+
+public:
+	enum Component_t
+	{
+		COMP_INVALID = -1,
+
+		COMP_VTX,
+		COMP_FACE,
+
+		STANDARD_COMP_COUNT
+	};
+
+	// resolve internal data from changed attributes
+	virtual void Resolve();
+
+	// What type of component is this
+	Component_t Type() const;
+
+	// How many pieces are in this component
+	virtual int Count() const;
+
+	// Are there no pieces in this component
+	bool IsEmpty() const;
+
+	// Are all possible pieces in this component
+	bool IsComplete() const;
+
+	// Is this an equivalent component to another component
+	virtual bool IsEqual( const CDmeComponent *pRhs ) const;
+
+	// Reset to an empty selection
+	virtual void Clear();
+
+protected:
+
+	CDmaVar< int > m_Type;
+	CDmaVar< bool > m_bComplete;
+};
+
+
+//-----------------------------------------------------------------------------
+// The default type is invalid
+//-----------------------------------------------------------------------------
+inline CDmeComponent::Component_t CDmeComponent::Type() const
+{
+	const int type( m_Type.Get() );
+	if ( type < 0 || type >= STANDARD_COMP_COUNT )
+		return COMP_INVALID;
+
+	return static_cast< Component_t >( type );
+}
+
+
+//-----------------------------------------------------------------------------
+// Are there no pieces in this component
+//-----------------------------------------------------------------------------
+inline int CDmeComponent::Count() const
+{
+	Assert( 0 );
+	return 0;
+}
+
+
+//-----------------------------------------------------------------------------
+// Are there no pieces in this component
+//-----------------------------------------------------------------------------
+inline bool CDmeComponent::IsEmpty() const
+{
+	return Count() == 0;
+}
+
+
+//-----------------------------------------------------------------------------
+// Are all possible pieces in this component
+//-----------------------------------------------------------------------------
+inline bool CDmeComponent::IsEqual( const CDmeComponent *pRhs ) const
+{
+	return Type() == pRhs->Type() && Count() == pRhs->Count() && IsComplete() == pRhs->IsComplete();
+}
+
+
+//-----------------------------------------------------------------------------
+// Are all possible pieces in this component
+//-----------------------------------------------------------------------------
+inline bool CDmeComponent::IsComplete() const
+{
+	return m_bComplete.Get();
+}
+
+
+//-----------------------------------------------------------------------------
+// Reset to an empty selection
+//-----------------------------------------------------------------------------
+inline void CDmeComponent::Clear()
+{
+	m_bComplete.Set( false );
+}
+
+
+//-----------------------------------------------------------------------------
+//
+//
+//
+//-----------------------------------------------------------------------------
+class CDmeSingleIndexedComponent : public CDmeComponent
+{
+	DEFINE_ELEMENT( CDmeSingleIndexedComponent, CDmeComponent );
+
+public:
+	// resolve internal data from changed attributes
+	virtual void Resolve();
+
+	// From CDmeComponent
+	virtual int Count() const;
+
+	bool SetType( Component_t type );
+
+	void AddComponent( int component, float weight = 1.0f );
+
+	void AddComponents( const CUtlVector< int > &components );
+
+	void AddComponents( const CUtlVector< int > &components, const CUtlVector< float > &weights );
+
+	void RemoveComponent( int component );
+
+	bool GetComponent( int index, int &component, float &weight ) const;
+
+	bool GetWeight( int component, float &weight ) const;
+
+	void GetComponents( CUtlVector< int > &components ) const;
+
+	void GetComponents( CUtlVector< int > &components, CUtlVector< float > &weights ) const;
+
+	void SetComplete( int nComplete );
+
+	int GetComplete() const;
+
+	bool HasComponent( int component ) const;
+
+	virtual void Clear();
+
+	void Add( const CDmeSingleIndexedComponent &rhs );
+
+	void Add( const CDmeSingleIndexedComponent *pRhs ) { Assert( pRhs ); Add( *pRhs ); }
+
+	void Union( const CDmeSingleIndexedComponent &rhs ) { Add( rhs ); }
+
+	void Union( const CDmeSingleIndexedComponent *pRhs ) { Assert( pRhs ); Add( *pRhs ); }
+
+	CDmeSingleIndexedComponent &operator+=( const CDmeSingleIndexedComponent &rhs ) { Add( rhs ); return *this; }
+
+	void Subtract( const CDmeSingleIndexedComponent &rhs );
+
+	void Subtract( const CDmeSingleIndexedComponent *pRhs ) { Assert( pRhs ); Subtract( *pRhs ); }
+
+	void Complement( const CDmeSingleIndexedComponent &rhs ) { Subtract( rhs ); }
+
+	void Complement( const CDmeSingleIndexedComponent *pRhs ) { Assert( pRhs ); Subtract( *pRhs ); }
+
+	CDmeSingleIndexedComponent &operator-=( const CDmeSingleIndexedComponent &rhs ) { Subtract( rhs ); return *this; }
+
+	void Intersection( const CDmeSingleIndexedComponent &rhs );
+
+	void Intersection( const CDmeSingleIndexedComponent *pRhs ) { Assert( pRhs ); Intersection( *pRhs ); }
+
+protected:
+	int BinarySearch( int component ) const;
+
+	CDmaVar< int > m_CompleteCount;
+	CDmaArray< int > m_Components;
+	CDmaArray< float > m_Weights;
+};
+
+
+#endif // DMECOMPONENT_H
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