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A Practical and Robust Bump-mapping Technique for Today's GPUs

By Mark J. Kilgard


Bump mapping is a normal-perturbation rendering technique for simulating lighting effects caused by patterned irregularities on otherwise locally smooth surfaces. By encoding such surface patterns in texture maps, texture-based bump mapping simulates a surface's irregular lighting appearance without modeling the patterns as true geometric perturbations to the surface. Bump mapping is advantageous because it can decouple a texture-based description of small-scale surface irregularities used for per-pixel lighting computations from the vertexbased description of large-scale object shape required for efficient transformation and rasterization. This paper describes a practical and robust bump-mapping technique suited for the capabilities of today's Graphics Processor Units (GPUs)

Topics: texturing, per-pixel lighting, register combiners, GeForce 256, Quadro, OpenGL
Year: 2000
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