Tile rendering issues

[RecentSpacesSam]

Hey guys,

For a while in the studio we've been using "tile" rendering to divide large images into smaller jobs on the farm but recently we've run into an issue where there are lighting discrepancies at the border of the each tile. We initially thought it was down to the UHD cache being read incorrectly but after some testing it seems the issue is coming from elsewhere.

3DS Max 2024.1
Corona 10.1
Pulze 2.2.6

It's worth noting that the issue only started appearing after we upgraded from Corona 9.1 to 10.1 so I believe the issue has come through that update. So far we've tried:
- setting secondary GI to UHD Cache, 4k Cache and Path Tracing
- bloom and glare disabled
- caustics disabled
- use legacy environment map filtering (this was already on as the scene was originally created in 9.1
- disable adaptivity

The issue is mostly visible in the Direct/Indirect/Reflect elements (and of course beauty)

I'll see what we can do about getting a test scene over to you guys too.

Cheers

[Aram Avetisyan]

Hi Sam,

Besides a sample scene, can you also post some examples of how exactly the discrepancies look?
Are those discrepancies seen after you merge the tiles in a post app (Photoshop or so)? Or they can be clearly seen even in the vfb?

[maru]

Are you using denoising?

[RecentSpacesSam]

Hey guys,

Unfortunately this project is still under NDA so I can't share screenshots but the general "look" of the discrepancy is almost as if the gamma has changed slightly between the two images.
The original scene was using denoising but this has since been disabled and the issue persists.

[maru]

Are you overriding the scene environment using Pulze or some other way? We recently had a case where using Pulze Render Manager with tile rendering + Corona DR resulted in different tiles getting a different environment map. This caused massive differences between each tile. If that's the case, please let us know here and we should be able to suggest some workarounds.

If you could share a sample scene (even stripped/simplified), that would be great.