A couple random black pixels?

Support Lighting and Rendering
1

Been messing around with cutting edge from the PPA. Which at this time has v2.78.4 on the header.

blueBottle2.png800×800 590 KB

Not sure what’s causing it, but I’m getting some random black pixels which seem to be the negative equivalent to fireflies. I mentioned this happening before on occasion with the cutting edge version, and it was suggested it was a bug. In this case I’m using multiscatter GGX in the glass shader of the material, and the new light sample threshold setting. (Although there may be other factors involved.) So here’s the pasteall file if anyone wants to look into it:
http://pasteall.org/blend/index.php?id=45842

2

Seems to be related to samples. Black pixels at 2000 samples, but clean at 200 samples. 2.78.4 on Ubuntu 16.04

3

I’ve found that Multiscatter GGX seems to have some role in this as well. Or at least it’s easier to get the black pixels to occur.

4

Seems like this bug was fixed in the release that came out today. :slight_smile:

Version 2.78-67053-a7f16c17c26 (Hoping I got that right, no obvious way to copy-paste it.)