Global Illumination renders artifacts

[Adam Trachtenberg]

Sounds like you’re not using the appropriate GI mode. If just the camera is moving you should use camera animation mode. If the camera and objects are moving you’ll have to use full animation mode.

[Frank Ruggiero]

Hi Adam,

Thanks for responding. I am trying the full animation render, though it is taking an incredible amount of time to render. Is there anyway I can speed it up, or is this what I am up against?

The artifacts, I am referring to, are blotchy dirty. They almost look like brown stains. Would you mind if I emailed you a jpeg of exactly what I am talking about?

Thanks again.

Frank

[Adam Trachtenberg]

I’d be happy to look at a frame. Send it to adamt (at) 3danvil.com.

In the mean time I highly recommend this excellent GI tutorial by Michael Vance:
https://mvpny.com/R11GITutorial/R11GITutorial_Part1.html

[David Cabestany]

Could anyone some light on why I’m still getting artifacts when I’m using IR+QMC Full animation? I literally tried all modes and I;’m getting artifacts on all of them, I’m trying a prepass just on one machine first so I can send it to net render and complete the job, but I’m stuck here.

If anyone can assist would be great, I’m on a really bad deadline and I still have 833 frames to go.

[Brian Jones]

settings are very important not just the modes I’d have to know a lot more can you post the scene? – and are you using AO as well?

[David Cabestany]

I am using AO too.
Here’s the scene, however the settings are different now, I switched to IR+QMC (Net Render) and I’ve been doing tests only on my machine, just now I was about to test it over the network to see how it renders when it’s really on a (crappy) farm.

So far the renders have came out fine with this new settings, although I’m stopping the updating records for diffuse depth as it adds a lot of additional time to my rendering, is that an absolute necessity of the pass or can I live without it?

Thank a lot!

5779_emergerf.c4d.zip

[Brian Jones]

I’ve never done GI in a net render so I don’t know much there except the render farm should be all the same machines (or at least all the same CPU – xeon, core, etc), If not you can get frame to frame differences

[David Cabestany]

That totally sucks, my three machines are all different.
Guess I’m out of luck then.

Thanks for your help.

[David Cabestany]

Wait, time for a stupid question, does an i7and an i5 could count as the same type?

[Brian Jones]

don’t know, they are both Core2 architecture the differences that matter would be in the FPU but they are close enough to be worth a try.

I’ve had a chance to play with the settings and do some test renders (just the frames you had set 378-390), I can speed it up a lot but the renders don’t get much better – instead of dark blotches I’m getting light patches that move with that, I am getting some success by turning up the settings. I’ll let you know