Heh I asked exactly about this to Ondra when we talked recently, basically controls for aggressivness of filter, and blending of filtered and non-filtered in framebuffer. He said it's doable, but said it didn't yield positive results from his tests. But that's no definite no :- )How I planned to use this, was to do this manually, output both filtered and un-filtered results, and mask them with mat-ID pass for mats with little high-frequency details, like flat painted surfaces. There is no detail that I can loose in white ceiling, but I always have shit-ton of noise there.
I may rethink my attitude towards denoising :] 1 minute render test.
Tried to achieve 3d printed look. Not very successful, though.