基于MIP-MAP预过滤的区域取样球面纹理映射

Sphere texture mapping using footprint area sampling based on MIP-MAP prefiltering

球面是常见的二次曲面。它使用曲面分割原理对球面进行分割,并应用区域取样方法实现了对球面的纹理映射。为了减少计算花费,采用MIP-MAP预过滤纹理,并改进了在每一个可选的MIP-MAP层的取样率,以避免在较低层欠取样,在较高+1层过取样。这种方法能取得理想的纹理映射效果,有效解决走样问题。

Sphere is a kind of common quadric surfaces. It uses the principles of quadric surfaces subdivision to subdivide the sphere and applies the footprint area sampling method on sphere texture mapping. Prefiltering based on MIP-MAP is used to reduce the computing cost. The sampling rate is adapted in each chosen MIP-MAP level separately to avoid undersampling in level l and oversampling in level 1＋1. This method can effectively obtain high quality texture mapping images and resolve the problems of aliasing.