When I create a material (even a simple flat-colored one) then copy (regular copy with shift D) the object and give it a different material, the original object’s preview (in material preview mode) flickers between its own material (actually applied to it) and the one from the copy (that it shouldn’t even know exists).
Does anyone else have this issue? I haven’t found any mention of it anywhere.
Additional note: it happens when I create a mesh with the same geometry, so if the original mesh is the default cube, the bug happens too if I add a new cube (instead of copying); and if the original mesh is the default cube that I added a loop cut to, and the “copy” is a freshly added default cube, then the bug happens to the non-loop-cut faces only.
Additional note 2: I’m using blender 5.2.2.
Just a wild guess: Is the copied object positioned exactly at the same place as the original object?
Does the flickering go away when you move one of the objects slightly?
If this works: Google “Z-Fighting”. This happens when two or more polygons cover the same 3D space and cause all kinds of artifacts.
You’re using EEVEE, does this also happen when using Cycles?
Can you try to switch off “Temporal Reprojection” or “Denoising” in EEVEE?
(You may have to switch your Render Engine to EEVEE to have access to these settings, in your video you’re just using the “Material Preview”).
Thank you for the suggestions; I just tried them.
Both eevee and cycles do that, even with Temporal Reprojection turned off. I did not find any “denoise” option in eevee (I assumed you were talking about the Properties > Scene tab) except under “raytracing”, which is turned off, and turning off Cycles’ denoise (under Sampling > Viewport and Sampling > Render) did not fix it either
I’ll have access to a different computer next week, so I’ll check whether it does it there too.
I also checked and no such behavior (5.2.2 Open Suse)
The main thing to check apart from GPU and drivers would be addons, If you are using addons try turning them off one by one and also all of them at once (it could be that 2 different addons are fighting each other).
This certainly is not “normal behavior”. So maybe also list all your system specs, OS, Hardware etc
Maybe someone with similar specs could try and confirm.
Besides making sure the drivers are actually up to date, I would try switchin OpenGL and Vulcan graphics backends in the preferences to see if that makes a difference. That seems to solve quite a few problems lately. There seem to be different kinds of bugs in each. But I think it’s the GPU drivers. Makes sense - 5.2.2 was released few days ago, it makes sense that they develop stuff with most recent drivers and so that gets tested most.
. In Blender 5.3 Vulkan is the default.