how to do degrain in houdini?(or shake)I used blur first, and the sharpen, but I can't get nice effect as such effect in flame.

No, it wouldn't be the same. AFAIK, the current release of Houdini doesn't have a degrain tool. Just doing a quick search on google gave me this program [math.iastate.edu], which shows the sort of math one might need to do to accomplish this, and shows it's not quite as simple as blurring and sharpening…

I would suggest you try porting this to VEX, but people get hit on the head these days for suggesting DIY projects in houdini as solutions to problems. But no, there's not an existing tool to do this…

Cheers,

J.C.

thx, I have found a plus of shake can do degrain.