Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => Topic started by: 394452216@qq.com on 2025-07-26, 11:04:02

Title: Some render as black.
Post by: 394452216@qq.com on 2025-07-26, 11:04:02

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

Code: [Select]

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

Title: Re: Some render as black.
Post by: 394452216@qq.com on 2025-07-26, 12:26:13

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?

Code: [Select]

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

absorptionDistance < obj_height

Title: Re: Some render as black.
Post by: maru on 2025-07-28, 13:14:26

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 - https://my.chaos.com/download/build?product=Corona
The detection of camera inside a medium is improved there, so there is high chance that it would render correctly for you.

Title: Re: Some render as black.
Post by: 394452216@qq.com on 2025-07-28, 15:18:29

Interestingly, it works normally in IR mode.