Hemicube (computer graphics)

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See also Hemicube (geometry)
Unfolding a hemicube

A hemicube is a concept used in 3D computer graphics rendering. A hemicube is one way to represent a 180° view from a surface or point in space.


Although the name implies any half of a cube, a hemicube is usually a cube cut through a plane parallel to one of its faces. Therefore it consists of one square face, two 2:1 aspect ratio rectangles, and two 1:2 aspect ratio rectangles.


The hemicube may be used in the Radiosity algorithm or other Light Transport algorithms in order to determine the amount of light arriving at a particular point on a surface.

In some cases, a hemicube may be used in Environment Mapping or Reflection Mapping.