Lecture04 real-time shadow 2 1 PCF的数学原理：Filter / Convolution2 PCSS回顾3 Variance Soft Shadow Mapping(VSSM)3.1 VSSM对PCF的优化3.1.1 切比雪夫不等式(Chebychev's inequality)2.1.2 VSSM加速PCF的步骤总结 3.2 VSSM对Blocker Sea