just want to know if there is a visible or invisible catch to this. Thanks
Double sided material without backface culling will waste more pixels while rendering.
In general, when culling is enabled, polygons that face away from the camera are clipped after vertex shader phase. Meanign they do not even reach pixelshader.
When backface culling is enabled, they do reach pixel shader, and are discarded by depth test, after taking some processing power from GPU. So generally, you’d want to use this on cloth and the like.
You can also get minor z-fighting at corners, though in most cases it will not be noticeable.
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