Scheme for providing wrinkled look in computer simulation of materials

摘要

Scheme for use in cloth simulation that provides a good dynamic "wrinkled" look to the cloth as it moves. The simulated area of each of the triangles in the triangle mesh is compared with the original area of the triangle to determine how much it got compressed or stretched during animation. This comparison is then used as a basis for altering the lighting of the pixels representing the triangles in order to improve the appearance of the wrinkles in the cloth. The lighting of each pixel is altered by altering a surface normal of the pixel using a value obtained from each of one or more normal maps. Normal maps are selected by using wrinkle ratios that are calculated based on the above mentioned comparisons.