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I wonder if it is somehow possible to change the background of the material preview window in Blender 3.2.

The default setting shows a checkerboard pattern on a grid:

enter image description here

And I found the question here, of course: How to change the background colour in the Material Preview window?

But apart from the fact that this question has not been answered either, this is obviously a different problem.

I would have liked to use a custom scenery there (For example a photo studio wall with a soft edge, and a different base texture and viewed from a different angle).

Here I have found another interesting question/answer about this, in which you can see what I want to achieve, but this does not solve my problem: Material preview background color - Blender Cycles

Is this possible (without modifying the source code)?

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The preview scenes are defined by the preview.blend file, which is included in the compiled binary (not as a separate file). As far as I'm aware, Blender's preferences and Python API do not provide an option to modify the scenes. It appears you would have to build Blender yourself with an adapted preview.blend.

The current version of the material preview, at the time of writing, was introduced in the following commit: https://developer.blender.org/rBf5ea1fc4fbafbac6f648ba0d9d9ef16ca8323041

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    $\begingroup$ OK, I see, that's what I was afraid of. So I take the answer as "No, it's not possible without changing the source and compiling Blender.". Thanks! $\endgroup$
    – quellenform
    Jul 3, 2022 at 15:10

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