hi ,

I use the following and fine with overlay too:

Code:
technique animTree
{
	pass 
		{
			ZWriteEnable 		= True;		
			AlphaTestEnable 	= True;
		   AlphaBlendEnable 	= False;		   
			VertexShader = compile vs_2_0 animTree_VS(); 
		}
}

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