A physical-based Cloth Model for Virtual Reality

• Main Authors: Tseng,Jun Lin, 曾俊霖
• Other Authors: Jong, Bin-Shyan ; Lin, Tsong-Wuu
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/v9bcpx

碩士 === 中原大學 === 資訊工程研究所 === 84 === In computer graphics , cloth model is a very complex and an interesting problem. There are many scholars and experts devoting the construction , behavior and shading operations for the cloth model. In general , the cloth model is classified into geometrical-based and physical-based models. In the geometry , the construction , simulation , and display of cloths are based on the surface representation. In the physical- based model , researches are based on the energy and the force for the cloth. In this thesis ,we focus on physical-based particle model. Based on the physics , the internal and the external force models for the cloth are built. The cloth is subdivided into equal-sized grids. The microscopic particle is the primitive element in our model. The dynamic situation of the cloth is simulated by the behavior of each particle. The computation cost of simulation is increased exponentially due to the interrelations between particles. To reduce the computation cost, the expansion of the interrelated actions is analyzed hierarchically. Some slight interrelated actions are ignored and the computation cost are changed from exponential into linear time. In the reality, the collision detection is an important factor for the cloth model. We propose a new method for the collision detection to improve the performance of the cloth model. An object in the three-dimensional space is projected into 3 perpendicularly planar tables. If two objects are intersected, then their projections are in the same entry of each planar table. Therefore the collision detection of two objects should be eliminated if the entries of their projections are different at least one planar table. By the way, the number of collision detections is reduced dramatically.