Wonder how noise percentage is calculated? I have some really simple scene - simple object with basic materials in white studio, lit by single HDRI. Pass limit is set to 50 and noise to 2%. Without adaptivity it renders in about 2 minutes (50 passes), with adaptivity it takes about same time (20 passes, 1,3% noise treshold). After denoise pass both images looks identical. I think it's perfectly normal. Strange things happens when i assign override material with CoronaWire map. Without adaptivity it takes about 2 min and with adaptivity - 4 min (50passes, 2,1% noise). After denoising both images looks identical. Question is why adaptivity struggles with wire? Could it more effectively distinguish texture from noise?
I would love to know exactly what the adaptive actually does, because I haven't seen any real speed gains.
So how does it work? the way I'm guessing is one of two ways:
1. it stops sampling in areas where the noise threshold has been reached, and therefor going through the max passes faster ( in theory) the more passes and the longer the render? (shouldn't render time be shorter then?)
2. It doesn't affect render time at all, instead it increases overall quality by not having to sample the entire image every pass, but it's able to divert samples to areas that are still under the noise level? (doesn't make much sense if you don't set a max pass but only noise threshold).
I'm just not seeing any big difference when using it? can anyone clarify?
thanks