   vsm on d3d9
  i want to implement a vsm on d3d. But the g32r32f format texture is can't being hardware fliter?how can i solve it?thaknk you.   
  is anyone can tell me the vsm on d3d9 ?where can i find some sample?   ;  Older hardware won't support filtering of certain formats...there's no way around that. DX10-level hardware will have much more uniform support for filtering supported formats.  So your choices are:1. Use a different format that supports filtering, and live with the precision issues2. Require DX10-level hardwareor 3. Use a different technique.   