Hardware based Bézier Patch Renderer

G. Reis (Germany)


Patch Rendering, Hardware Acceleration, Shader Program ming


This paper presents a new hardware based method to render functionally represented B´ezier patches. In contrast to subdivision driven visualization methods the renderer in cludes an automatic level of detail (LoD) technique, since all computations are done on a per fragment basis. There fore the viewing ray is transformed to the functional do main of the patch and intersected with it. The search for the actual hit/intersection point is done by root searching. The patches own attributes like single- or double-sided as well as material properties and textures. The illumination is done using the Phong illumination model. Depth buffer updating, needed to embed this technique into existing vi sualization systems, is performed.

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