OpenGL extension EXT.vertex_weighting
This module customises the behaviour of the
OpenGL.raw.GL.EXT.vertex_weighting to provide a more
Overview (from the spec)
The intent of this extension is to provide a means for blending
geometry based on two slightly differing modelview matrices.
The blending is based on a vertex weighting that can change on a
per-vertex basis. This provides a primitive form of skinning.
A second modelview matrix transform is introduced. When vertex
weighting is enabled, the incoming vertex object coordinates are
transformed by both the primary and secondary modelview matrices;
likewise, the incoming normal coordinates are transformed by the
inverses of both the primary and secondary modelview matrices.
The resulting two position coordinates and two normal coordinates
are blended based on the per-vertex vertex weight and then combined
by addition. The transformed, weighted, and combined vertex position
and normal are then used by OpenGL as the eye-space position and
normal for lighting, texture coordinate, generation, clipping,
and further vertex transformation.
The official definition of this extension is available here:
|EXTENSION_NAME = 'GL_EXT_vertex_weighting'|
GL_CURRENT_VERTEX_WEIGHT_EXT = GL_CURRENT_VERTEX_WEIGHT_EXT
GL_MODELVIEW1_EXT = GL_MODELVIEW1_EXT
GL_MODELVIEW1_MATRIX_EXT = GL_MODELVIEW1_MATRIX_EXT
GL_MODELVIEW1_STACK_DEPTH_EXT = GL_MODELVIEW1_STACK_DEPTH_EXT
GL_VERTEX_WEIGHTING_EXT = GL_VERTEX_WEIGHTING_EXT
GL_VERTEX_WEIGHT_ARRAY_EXT = GL_VERTEX_WEIGHT_ARRAY_EXT
GL_VERTEX_WEIGHT_ARRAY_POINTER_EXT = GL_VERTEX_WEIGHT_ARRAY_POINTER_EXT
GL_VERTEX_WEIGHT_ARRAY_SIZE_EXT = GL_VERTEX_WEIGHT_ARRAY_SIZE_EXT
GL_VERTEX_WEIGHT_ARRAY_STRIDE_EXT = GL_VERTEX_WEIGHT_ARRAY_STRIDE_EXT
GL_VERTEX_WEIGHT_ARRAY_TYPE_EXT = GL_VERTEX_WEIGHT_ARRAY_TYPE_EXT
__file__ = '/home/mcfletch/pylive/OpenGL/GL/EXT/vertex_weighting.pyc'
__name__ = 'OpenGL.GL.EXT.vertex_weighting'
__package__ = 'OpenGL.GL.EXT'
glVertexWeightPointerEXT = <OpenGL.platform.baseplatform.glVertexWeightPointerEXT object at 0x77b9150>
glVertexWeightfEXT = <OpenGL.platform.baseplatform.glVertexWeightfEXT object at 0x77b9050>
glVertexWeightfvEXT = <OpenGL.platform.baseplatform.glVertexWeightfvEXT object at 0x77b9110>