Some render as black.

Corona Corona for 3ds Max Issues
1

Hello, I noticed that the screen goes black at certain angles, and it seems to be an issue with this model.

A: CMaskChannel is OK Black Beauty
B: Everthing is OK

$cam.pos = [729.648,-2663.64,246.706]
$cam.target.pos = [1818.03,3508.9,2018.18]

Scene_2024_CR12.1.max (1.52 MB)

A.png
A.png830×602 96.1 KB

B.png
B.png841×594 90 KB

2

Hello! I found the cause — it’s due to the material’s absorptionDistance property. Could it be because the value exceeds the thickness of the model?


a = $
$PolyMesh:BUG OBJECT @ [4492.307129,3074.154297,2863.999756]
obj_height = (a.max - a.min).z
0.000244141

absorptionDistance < obj_height
3

Hi, absorption can cause black screen rendering. Please see this article: https://support.chaos.com/hc/en-us/articles/33844546706193

One solution would be updating to Corona 13 - Download | My Chaos
The detection of camera inside a medium is improved there, so there is high chance that it would render correctly for you.

4

Interestingly, it works normally in IR mode.