Access Restriction

Author Sander, Pedro V. ♦ Gu, Xianfeng ♦ Gortler, Steven J. ♦ Snyder, John
Source CiteSeerX
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Anchored Cone ♦ Novel Representation ♦ Normal Map ♦ High-resolution Mesh ♦ Hardware Stencil Buffer ♦ Rendered Coarse Geometry ♦ Alpha Buffer ♦ Hierarchical Culling ♦ Proper Clipping ♦ Perspective View ♦ Texture-mapped Mesh Result ♦ Detailed Model ♦ Search Tree ♦ Coarse Mesh ♦ Original Model ♦ Extracted Silhouette Edge ♦ Turn Clip ♦ Rendering Time ♦ Similar Quality ♦ Improved Technique ♦ Silhouette Clipping ♦ Progressive Hull ♦ Original Mesh ♦ Polygonal Silhouette ♦ Coarse Geometry ♦ Exact Silhouette
Description Approximating detailed models with coarse, texture-mapped meshes results in polygonal silhouettes. To eliminate this artifact, we introduce silhouette clipping, a framework for efficiently clipping the rendering of coarse geometry to the exact silhouette of the original model. The coarse mesh is obtained using progressive hulls, a novel representation with the nesting property required for proper clipping. We describe an improved technique for constructing texture and normal maps over this coarse mesh. Given a perspective view, silhouettes are efficiently extracted from the original mesh using a precomputed search tree. Within the tree, hierarchical culling is achieved using pairs of anchored cones. The extracted silhouette edges are used to set the hardware stencil buffer and alpha buffer, which in turn clip and antialias the rendered coarse geometry. Results demonstrate that silhouette clipping can produce renderings of similar quality to high-resolution meshes in less rendering time.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 2000-01-01
Publisher Institution In Proceedings of ACM SIGGRAPH 2000, Computer Graphics Proceedings, Annual Conference Series