GL_EXT_cull_vertex http://www.opengl.org/registry/specs/EXT/cull_vertex.txt GL_EXT_cull_vertex GL_CULL_VERTEX_EXT 0x81AA GL_CULL_VERTEX_EYE_POSITION_EXT 0x81AB GL_CULL_VERTEX_OBJECT_POSITION_EXT 0x81AC void glCullParameterdvEXT (GLenum pname, GLdouble* params) void glCullParameterfvEXT (GLenum pname, GLfloat* params)