Shifting bump map

[johannes_roevens]

Hi,

Since recently we're experiencing a bug that seems to happen at random.

At times when rendering a scene some materials have their bump map shifted like in the example below. Neither of the bitmap slots have a UV randomizer, it always seems to work properly after restarting SketchUp and the bug randomly starts to happen after having started a few renders. All this without having touched or adapted said material.

We have a .vrscene exported of this scene in case you'd need it, it also happened with a previous project.

[johannes_roevens]

We have some more info to bring and found a way to replicate the issue:

The shifting only happens in 2 points perspective when zoomed in on the model. As you can see in the pictures when the render is in 2 points and zoomed the bump gets weird, when we render the same but in perspective the bump map is reacting as expected.

The issue only seems to appear with bump maps and not with normal maps.
We did try clearing the slot and adding the bump map/bitmap again without success.

[natalia.gruzdova]

Hello johannes_roevens,
Thank you for your post.

I tried to reproduce what you describe but was not able so far. Could I please ask you to share:

• Your exact V-Ray version (check About window V-Ray for SketchUp window);
• SketchUp version;
• Your scene or part of the scene where the issue can be reproduced consistently. You can attach .zip here on forum or if the file size is too big - open a ticket using this submit request form and upload your scene in the ticket. Make sure to archive it with the Pack Project tool (Extensions>V-Ray>Pack Project tool).

Waiting for your reply.

[johannes_roevens]

Hi Natalia,

Vray version: V-Ray 6.20.04
SketchUp: 23.1.340

We have sent the project through the submit request form, ticket number: 254399

Best regards,