Further speedup of interactive rendering

Corona Corona for 3ds Max General
1

Interactive rendering is THE main reason I use Corona. I love it!

But as I was fiddling around just now in the Render Settings Devel/Experimental rollout I was thinking, besides changing the UHD Cache precision, what can one change to further speedup IR in that specific rollout?

2

You probably won’t like it, but there is a way to massively speedup IR. You need to go to render setup system settings and set upscaling to 2 (can’t recall exact naming, but you should be able to find it) - that surely will boost IR.

3

Well, this actually helps when setting up lighting :slight_smile: Thanks romullus!

4

Some ways to make IR faster / more responsive at the cost of overall quality:
I suggest saving the “regular” render settings as a backup. Then using these ones only when in need of ultimate IR speedup:

  • Performance > Gi vs AA 8
  • Performance > LSM 1
  • Performance > MSI as low as possible without the image becoming very dark (10?)
  • Performance > Max ray depth as low as possible without getting problems with reflections / refractions and lighting (7?)
  • Performance > Enable “force path tracing” for IR
  • System > System settings > set IR threads to 0
  • Devel / debug > IR subsampling set to 4 (this will give you huge pixels at the first IR pass, but it will be faster)
  • Scene > Enable clay material override
  • Scene > Enable solid color environment override
5

Thank you Marcín! Always helpful to know :wink:

6

What I noticed about GI vs AA is that lowering the value is very similar to lowering the passes. For example I use 20 passes for IR as default. When I lower GI vs AA to 8 I get almost identical image as default GI vs AA value at 8 passes. So its easier to just lower the passes since this does not impact my non IR rendering. Both takes same amount of time to finish too.

7

You are right. Setting GIvsAA to 16 and rendering 4 passes will result in almost identical overall quality as when setting GIvsAA to 8 and rendering 8 passes. More info: https://coronarenderer.freshdesk.com/support/solutions/articles/5000526159

8

Yes, lowering passes I already do on a regular basis in IR. To me, no need to mess with GI/AA balance.