Bump Mapping
نویسنده
چکیده
Blinn [1] introduced bump mapping as a technique that makes a surface appear rough or wrinkled. This affect is achieved by perturbing the normals used in the illumination computation. Hence, it only affects the shading, not the underlying geometry. The bump map can contain height values that will affect the normal of each pixel. However, it can as an alternative contain normals that have been computed from such a bump map and this map is then called a normal map [7]. Especially moving frame bump mapping[10] [7] is closely related to shading since it includes vector interpolation, which is the essence of Phong shading. Bump mapping is also closely related to texture mapping [5]. It will also suffer from similar aliasing problems when bumps are magnified or minified. Blinn used an approximation for the perturbed normal, which depends on the surface normal and the height information in the bump map. The perturbed normal is calculated as
منابع مشابه
A Practical and Robust Bump-mapping Technique for Today’s GPUs
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 advantageo...
متن کاملHardware Supported Bump Mapping: A Step towards Ingber Quality Real-Time Rendering
Today's high-end Gouraud renderers produce nicely textured scenes by mapping two-dimensional images onto modeled objects in real· time. We present a renderer which textures surfaces in the normal sense of the word using bump textures to simulate wrinkled or dimpled color ful surfaces. Using a simplified bump mapping method we first suc ceeded in designing a real-time bump mapping renderer bas...
متن کاملDESIGN Pi2INCIPLES OF HARDWARE-BASED PHONG SHADING AND BUMP-MAPPING
The VISA+ hardware architecture is the first of a new generation of graphics accelerators designed primarily to render bump-, texture-, environmentand environment-bump-mapped olygons. This paper presents examples of the main graphical capabilities and discusses methods and simplifications used to create high quality images. One of the key concepts in the VISA + design, the use of reflectance cu...
متن کاملDesign Principles of Hardware-based Phong Shading and Bump Mapping
The VISA+ hardware architecture is the first of a new genera tion of graphics accelerators designed primarily to render bump-, texture-, environmentand environment-bump-mapped polygons. This paper presents examples of the main graphical capabilities and discusses methods and simplifications used to create high quality images. One of the key concepts in the VISA+ design, the use of reflectance ...
متن کامل