What settings need to be tweaked to get a clean (noiseless) render? Multiple tests ranging from 100-1000 rays (up to 12 minutes time) using Path Tracing are still yielding a very grainy render. I'm unclear what to tweak to make this go away.
Also, I have 3 gpus (1080gtx, 970gtx, 970gtx) but I can only activate two of them (1080 and 970). Any idea why the third gpu won't let me activate it? Clicking on its checkbox doesn't do anything ... it stays unchecked.
What is the speed boost multiple GPUs give? If I go from 1 970gtx to 2 970 gtxs, would that be a theoretical 200% speed increase, or is it fractional?
Lastly, what are the minimum recommended specs / settings for a 30minute long animation? Even at 1 minute per frame (much less than my current renders are taking, even with the noise), that would be 1minute x 24 fps x 60 seconds per minute x 30 minutes, which is 43200minutes or 720 hours or 30 full days ... which is way too long of a render time for an individual to realistically create a "show" type of thing. Especially when multiple takes to get it right are factored in. To get this down to even a 24 render period would be a 2second per frame render, and a 1 week render would be a 14 second render ... is that at all realistic for an individual using Unity to achieve? I was hoping that with over $1k of video cards things would be fast enough to render something with decent quality fast enough to create a "show" ... is this just way out of my $$$ league right now?
as a test, I'm getting between 2-12 minutes to render a frame, but thats still with noise, so I'm unclear if that time can go less because the problem is not related to rays or needs to be bumped up much more to become clean.
Sorry for the questions ... I'm a programmer by trade, so I'm unclear about what's realistically possible for an individual hobbyist using Unity + Octane.