glCullFace — specify whether front- or back-facing polygons can be culled
Specifies whether front- or back-facing polygons are candidates for culling. Symbolic constants
GL_FRONT_AND_BACK are accepted. The initial value is
glCullFace specifies whether front- or back-facing polygons are culled (as specified by mode) when polygon culling is enabled. Polygon culling is initially disabled. To enable and disable polygon culling, call the glEnable and glDisable commands with the argument
GL_FRONT_AND_BACK, no polygons are drawn, but other primitives such as points and lines are drawn.
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