Possible 9.6.0 regression with environment texture rendering

Development
1

The following script loads a cube map as a skybox environment texture and plots a metallic sphere with PBR.

env_texture.py (2.8 KB)
cubemap_park.zip (592.7 KB)

Usage: download script and unzip cubemap files. Then run

python env_texture.py cubemap_park

With vtk==9.5.2, we get this image, where the reflection is showing what’s behind the camera. This appears correct to me.

env_texture_9.5
env_texture_9.51224×980 207 KB

But with vtk==9.6.0rc2, we get this instead, where the reflection is showing the same contents as the foreground image.

env_texture_9.6
env_texture_9.61224×980 216 KB

This seems like a regression, but I am not sure… maybe someone can comment on whether this is a bug or is intentional?

By installing the dev wheels, I was able to confirm that we get the first image with vtk==9.5.20250830.dev0, and we get the second with vtk-9.5.20250913.dev0, so the change occurred between Aug 30 and Sept 13.

I think perhaps this commit may be the cause of the change?
https://gitlab.kitware.com/vtk/vtk/-/commit/2ec9432207980adf303e2266d4c5485f638a4269
I believe it was committed to master Sep 8.

2

@LucasGandel @lgivord

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I reproduce the issue on Linux too, I’ll take a look.

Thanks also for the bisect, it’s very useful :slightly_smiling_face:

4

here is the issue : https://gitlab.kitware.com/vtk/vtk/-/issues/19910

1 Like
5

@user27182 FYI the issue is resolved, it should be testable in the wheel generated tomorrow.

Thanks for your bug report and for testing the RC2 :slightly_smiling_face:

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It will even be present in the 9.6.0-RC3.

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Thanks for the fix! Looks like the dev wheels upload didn’t succeed:

image
image1214×866 66.5 KB

I’ll try again later with either the next dev wheel or with RC3, probably will try both whenever they’re uploaded.

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Ill let you know when they are

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rc3 wheels were published yesterday, can confirm this is fixed :+1:

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