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Determines whether backface culling is enabled when drawing meshes. A [i]backface[/i] is a polygon seen from an angle in which its vertices are arranged in clockwise order. All faces have a front side and a back side determined by this winding rule. When backfaces are hidden, geometry can be seen through if not viewed from its front. In addition to rendering, this also affects hit detection.

For use cases outside of editing, meshes are typically rendered with backfaces hidden. A well-formed mesh is generally expected to be a continuous surface with no holes or reversed faces in it, which will look identical whether backfaces are shown or hidden unless the camera is viewing it from inside. Any such deformities can be detected using [link=select_vertices_bordering_holes]Select Vertices Bordering Holes[/link] and [link=select_winding_seams]Select Winding Order Seams[/link].