WIP example for real-time collision detection features of Bullet

examples/CommonInterfaces/CommonRenderInterface.h

@@ -51,6 +51,7 @@ struct CommonRenderInterface
     
 	virtual void writeTransforms()=0;
     virtual void enableBlend(bool blend)=0;
+	virtual void clearZBuffer()=0;
 
 	//This is internal access to OpenGL3+ features, mainly used for OpenCL-OpenGL interop
 	//Only the GLInstancingRenderer supports it, just return 0 otherwise.