topic Re: 3DS Max naming rendered files _alt_ in 3ds Max Forum

3DS Max naming rendered files _alt_

ghlUVE8X — Wed, 01 Apr 2026 10:06:40 GMT

Hi everyone,

I need help understanding why 3ds Max renders some files with _alt_0 or _alt_4 appended to the filename. How does this happen, and what can be done to prevent it?

I don't work with 3ds Max myself. I'm an IT support for our sister company who uses it. They say this started happening after updating recently to another version. They work in 3ds max 2024.

Some additional context:
- The output folder is empty before rendering starts, so it's not a file conflict with existing files.
- It happens seemingly at random. Not on every frame.

- They use Corana 13 as renderer.

Thanks in advance from a confused IT supporter!

Re: 3DS Max naming rendered files _alt_

MartinBeh — Wed, 01 Apr 2026 11:17:26 GMT

Sounds like a Corona issue to me. At least I have not seen this happening with the built-in renderers of 3ds Max.

You could try asking at their forum? https://forum.corona-renderer.com/index.php

Re: 3DS Max naming rendered files _alt_

Casey_H_ — Wed, 01 Apr 2026 21:44:16 GMT

It is likely that the team is batch rendering variations from state sets using the same camera.

And if they are using the Deadline manager, there is some info regarding "_alt" being appended, but it's way down the page, so do a 'find' (Ctrl + F)
3ds Max — Deadline 10.4.2.3 documentation

Re: 3DS Max naming rendered files _alt_

lauri_barnhart — Mon, 06 Apr 2026 14:01:10 GMT

Hello, @ghlUVE8X,

Just checking in—did the responses shared by @MartinBeh or @Casey_H_ help clarify your question?

If so, please consider clicking the "Accept Solution" button. Doing so helps others in the community find answers to similar issues.

If your question still needs more attention, feel free to reply here with an update. This way, other members can jump in with further suggestions or guidance to help you move forward.

All the best,

Lauri | Community Manager

Re: 3DS Max naming rendered files _alt_

ghlUVE8X — Tue, 07 Apr 2026 06:45:12 GMT

Hi Casey

This is exactly what I'm looking for! Thank you so much for the help.

I will take a deeper look into it. I think this will solve my problem 🙂