Research of Modeling Method to 3D Multiresolution Terrain Based on Fractal
Tong Ming-an · 2000
The real-time terrain generation techniques based on Digital Terrain Model(DTM) have a high requirement to hardware. And in many practical ap plications there is no need to simulate the terrain of certain area. Also people want to generate various terrain with different shape characters in order to me et different requirements flexibly. At this time it is obviously uneconomical to still use the method based on DTM. For this reason, the paper studies the model ing approach to 3D fractal terrain using data as little as possible for the PC. The terrain belongs to the multiresolution model that has several levels of deta il coexisting. The projection of viewpoint is regarded as reference point from w hich a small primitive data set is generated, and forms multiresolution triangle meshes which define the shape of terrain base. Then, iteration is done by midpo int displacement and triangle edge sub-division method. It can produce natural terrains with different shapes. The construction method of multiresolution base has solved “spatial continuity” and “temporal continuity” between areas with different level of detail and avoids holes and seams, at the same time it dose not need extra computing works. Additionally, the base has a expansibility and c an be expanded to needed shapes. The experimental results show that the method i s simple, rapid and suitable for real-time display.