Max 2010 RC4 - Strange Artifacting in Emission Pass

Deprecated Krakatoa 1.5 Beta Discussion
1

This only happens when I render a sequence, single frames are fine.

The file is built in these steps

Setup Fume
Save Particle Channels
PRT Loader w/ particle sequence
Add KCM as described in help page
Render Sequence

You will obviously have to sim out the scene, it is not bad you only need the first 3 or so frames to see the error.

BTW this initially occurred in RC3, I just tried it in RC4 since you guys fixed the last bug I posted before I got to test the latest release.

Max2010_Artifacts.zip (29.9 KB)

a0000.png
a0000.png720×405 47.9 KB
a0001.png
a0001.png720×405 64.4 KB

2

We don’t have FumeFX for Max 2010 installed yet (we don’t use 2010 in production yet).
Can you right-click the pixels in the VFB and see what values are shown?

3

The pixel data is displaying the color. Pure red and pure yellow. The bad pixels however do not show up in the alpha.

4

What are the red and green values in those pixels?
There is no “pure red”, floating point 1.0 is pure red, 10.0 and 100.0 and 1000.0 are also pure red. I want to know if they appear to be infinitely high, esp. if you go down with the density.

5

Sorry, the real value is red 1.0, and it does not alter from red pixel to red pixel they all report the same value take .00001 but never over 1.0 . The yellow pixels report Red 1.0 and Green 1.0.

RedPixel.png

6

Would it be possible to prepare a Max 2008 version of the scene so we can test it here?
It would be interesting to find out how it is possible to get 0 alpha (which normally only happens in Additive rendering when Color and Absorption are black and Emission is a valid color).

7

Ok, here you go max 2008, it is tick for tack as close as I can get it. Also the issue does not occur max2008. Nor in 2010 on my 32-bit laptop.

Max2008_JRand_FlamingTeapot_RndrArtifacts_001.zip (29.1 KB)

Side note this seems to only be occurring on my 64-bit workstation:
WinXP64 SP2
Dual Intel 5160
8 gig ram