   PCSS + VSM
  Hi all, I am trying to experiment with NVIDIA's Percentage Closer Soft Shadows in Direct3D SDK 10 Code Samples. I want to replace the PCF Filtering with VSM, but i don't know how to deal with the filter radius from the Blocker Search?I also have the NVIDIA's Variance Shadow Mapping in Direct3D SDK 10 Code Samples,which uses the filter radius though the blur.If I use PCSS + VSM , should I use the blur ? I wish somebody tell you how to replace the PCF with VSM in detaily,thank you!   
  This is covered by Chapter 8 of GPU Gems 3, which you can read online here: http://http.developer.nvidia.com/GPUGems3/gpugems3_ch08.htmlI've not implemented it, but hopefully that helps you.   