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Coding polygon meshes as compressable ascii (2002)
| Content Provider | CiteSeerX |
|---|---|
| Author | Isenburg, Martin |
| Abstract | Because of the convenience of a text-based format 3D content is often published in form of a gzipped file that contains an ASCII description of the scene graph. While compressed image, audio, and video data is kept in seperate binary files, polygonal data is usually included uncompressed into the ASCII description, as there is no widely-accepted standard for compressed polygon meshes. In this paper we show how to incorporate compression of polygonal data into a purely text-based scene graph description. Our scheme codes polygon meshes as ASCII strings that compress well with standard compression schemes such as gzip. The coder is lossless when only the position and texture coordinate indices are coded. If loss is acceptable, positions and texture coordinates can be quantized and delta coded, which reduces the file size further. The gzipped scene graph description files decrease by a factor of two (six) in size when the polygon meshes they contain are coded with the lossless (lossy) ASCII coder. Furthermore we describe in detail a proof-of-concept implementation that uses the Shout3D [18] pure java API—a plugin-less Web3D player that downloads all required java classes on demand. Our prototype is an extremely lightweight implementation of the decoder that can be distributed at minimal additional cost. The size of the compiled decoder class is less than 6KB by itself and less than 3KB if included into a compressed archive of java class files. It makes no use of specific features of the Shout3D API. Hence, our method will work for any scene graph API that allows (a) to extend the node set and (b) to store the scene graph as ASCII. |
| File Format | |
| Publisher Date | 2002-01-01 |
| Access Restriction | Open |
| Subject Keyword | Compressable Ascii Compressed Image Widely-accepted Standard Compressed Archive Texture Coordinate Index Polygonal Data File Size Minimal Additional Cost Seperate Binary File Shout3d Api Required Java Class Polygon Mesh Ascii Coder Lightweight Implementation Decoder Class Texture Coordinate Text-based Scene Graph Description Scene Graph Ascii Description Scene Graph Api Ascii String Standard Compression Scheme Pure Java Api Gzipped File Compressed Polygon Mesh Text-based Format Plugin-less Web3d Player Java Class File Scheme Code Proof-of-concept Implementation |
| Content Type | Text |
| Resource Type | Article |
