# OpenGL.GL.EXT.cull_vertex

OpenGL extension EXT.cull_vertex

This module customises the behaviour of the
OpenGL.raw.GL.EXT.cull_vertex to provide a more
Python-friendly API

Overview (from the spec)

This extension introduces a method for culling vertexes in object
space based on the value of the dot product between the normal at
the vertex and a culling eye direction.

Culling a polygon by examining its vertexes in object space can be
more efficient than screen space polygon culling since the transformation
to screen space (which may include a division by w) can be avoided for
culled vertexes. Also, vertex culling can be computed before vertexes
are assembled into primitives. This is a useful property when drawing
meshes with shared vertexes, since a vertex can be culled once, and the
resulting state can be used for all primitives which share the vertex.

The official definition of this extension is available here:
http://www.opengl.org/registry/specs/EXT/cull_vertex.txt

## Functions

## Constants

GL_CULL_VERTEX_EXT (33194)

GL_CULL_VERTEX_EYE_POSITION_EXT (33195)

GL_CULL_VERTEX_OBJECT_POSITION_EXT (33196)