A performance optimisation in rendering in which if a [[Triangle]] is [[02 Areas/Computer Science/Triangle Orientation|Facing]] away from the camera. For some triangle $\triangle PQR$ with an [[Triangle Orientation|Orientation Vector]] $\vec n$ and some camera with a forward [[Vector]] $\vec c$, the triangle is culled (skipped) from rendering if $\vec c \cdot \vec n \leq 0$.