OpenGL Headline News

ZP+: correct Z-pass stencil shadows using the OpenGL Shading Language

Category: Developers

Feb 11, 2005

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ZP+ ( “Z-Pass Plus” ) is a new method for correcting the defects of the Z-pass method for rendering shadow volumes cast by a point light source. ZP+ uses an OpenGL Shading Language vertex program to clip the shadow-volume quads in a special way. It also takes advantage of triangle-strips and VBO since the mesh need not be cut into a light-cap and a dark-cap anymore. This yields frame-rates faster than Z-fail in most cases, and stencil shadows become more applicable to large meshes.

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