added initial support for per-triangle material properties in a non-convex mesh. needs testing.

Bullet/NarrowPhaseCollision/DiscreteCollisionDetectorInterface.h

@@ -34,6 +34,9 @@ struct DiscreteCollisionDetectorInterface
 		void operator delete(void* ptr) {};
 	
 		virtual ~Result(){}	
+
+		///SetShapeIdentifiers provides experimental support for per-triangle material / custom material combiner
+		virtual void SetShapeIdentifiers(int partId0,int index0,	int partId1,int index1)=0;
 		virtual void AddContactPoint(const SimdVector3& normalOnBInWorld,const SimdVector3& pointInWorld,float depth)=0;
 	};