Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: HannesN on 2025-02-15, 17:21:12

Title: [solved] Massive IR Slowdown - in one Scene only
Post by: HannesN on 2025-02-15, 17:21:12: Hi there!,

I was following a Youtube tutorial about creating an interior scene today. Just for the fun and learn some new things. Coming to the lighting i recognized a massive slowdown in Corona IR. It takes 15-20 seconds just to start rendering in the IR. Making an update takes even longer.

What it did
_Merged the old file in to a new one and imported just the geometry.
_Stripped the scene to a bare minimum. Deleted all scatters, all decorations and all unnecessary objects.
_Applied material overwrite with a standard corona material.
_Inserted a sun and sky

--> Same problem again.

I tested older client files and the corona sample scene (https://forum.corona-renderer.com/index.php?topic=4354.0) and there all is working fine again without any slowdowns. I added the stripped file as an attachment.

W10 / latest Corona build / 3dsmax 2015 - all up to date
11700k , 48gb RAM

What is wrong with the file?

Greetings
Hannes
Title: Re: Massive IR Slowdown - in one Scene only
Post by: ParaEagle on 2025-02-15, 19:39:11: In the Environment and Effects – Atmosphere section, there are numerous unnecessary fire effects. Remove them.
Title: Re: Massive IR Slowdown - in one Scene only
Post by: HannesN on 2025-02-15, 22:42:45: Thank you. Never thought about that, i never use the the effects rollout. I guess a marged object must have had these settings.

Works like a charm again :)

Greetings
Hannes
Title: Re: [solved] Massive IR Slowdown - in one Scene only
Post by: maru on 2025-02-17, 15:14:43: Here is a script which removes all 3ds Max atmospheric effects. I will also report:
- detecting the effects (since they may slow down rendering and are hard to pinpoint)
- adding the effects removal to the Corona Power Tools Scene Cleaner

(Report ID=CMAX-1488)
Title: Re: [solved] Massive IR Slowdown - in one Scene only
Post by: HannesN on 2025-02-17, 18:54:55: Thanks for the script. I created a RenderPreset with an empty scene und imported the preset into the other scene. Also cleaned all the effects :) .