Gi ?

[bernhard]

Hi there,

never had something before... GI settings are already extreme high...
light source just one hdri in the env slot...

please take a look at the attached image ....

curious... if you use the env gi slot only, isn't there any extra node to control the samples ?
I mean... to control the samples for each slot independent ?


vray 1.5 maya / fedora 64bit

[Morbid Angel]

can you post a scene? looks like the issue is something else

[bernhard]

hmm.. well.. I turned off GI just to test and see.. I wouldn't really need GI ... but I am wondering why I am getting such a crazy sampling ?

Would be great to figure out what's causing that issue:

FILE is here, ready for download:
http://www.mediafire.com/file/yb4jwd52288m62f/cg.zip

thx a lot and till later

[Morbid Angel]

Hey,
So the scene you have sent had some insanely high settings. But for me I did not get that noise. I have adjusted the scene with the settings that gave me most optimal speed vs quality. You can find it here:

http://www.mediafire.com/download.php?xg9hxosq6pdbycj

You may want to disable subpixel mapping, clamp output at 1 and linear workflow from color mapping settings unless your pipeline is built around them. Also your hdrs seem to be double gamma corrected, not sure why you would have that.

[bernhard]

hmmm... well thx for your test.. I really don't know why... but even if I turn GI off, I get the flickering...
when I break it into the passes... it looks like it comes from the reflection pass..

yes.. like I said, I tried already with insane settings to get rid of it... but even that didn't work...

The subpixel mapping, and the clmaping shouldn't cause any issues..
yes.. the hdr has additional a gamma node, but even if you kick them out.. it doesn't help.. I just did that, to crank up some values...

hmm.. now I need to check your file....

[bernhard]

hmm.. weired.. I saved your settings as preset.. you have much lower settings.. but after loading and rendeirng.. it takes much, much longer than my original insane settings...
I guess there must be something broken inside the vray settings....

will keep you posted with another try....

[Morbid Angel]

well its not just the settings in render globals. its also has direct relation to total samples in vray lights. also what vray build are you using? i am on v2 so the sampling could be a bit different. in any case, the examination of your scene did not yield any abnormalities and with my settings rendered properly. basically all i did was to reset everything back to defaults, then give the dmc sampler range -- 2/16, 2 for fine sampling of edges and thin lines, 16 for fine sampling in reflections. with these settings you can set your lights to be of a very high value, like 256 subdivisions same goes for brute force gi. lastly reducing the adaptivity amount will give you better result in the noise.

[bernhard]

yeah.. hmm.. well, doesn't matter.. I was rendering over the weekend with all different kind of settings... can't get rid of the flickering.. tripple checked all different kind of possibilities... no way to get that done...