Vertex color incorrectly displays in material view for meshes that share a material and do not have a vertex color layer after entering and leaving edit mode #53733
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Reference: blender/blender#53733
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System Information
Win8, GTX1070
Blender Version
Broken: 2.79 (
8760725
) and likely beforeShort description of error
Vertex color incorrectly displays in material view (cycles) for meshes that share a material and do not have a vertex color layer. This is in material view and using a material that shows the vertex color (so for example Attribute Col into a shader Color input). So if you've got mesh A with a vertex color layer using material Z and mesh B without a vertex color layer using the same material Z, mesh B will show in the 3dview as having the same color as mesh A even if mesh B doesn't actually have a vertex color layer. I would expect the Col input in the material to not have any effect if the mesh doesn't actually have a vertex color layer.
Note that you need to enter and exit edit mode in order for the color to incorrectly update on the additional mesh.
Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Expected behavior at 7: The other mesh should stay the same color as before because it doesn't have a vertex color layer and thus shouldn't be affected by any other meshes' vertex colors.
bug_vertex_color_incorrectly_displays_for_meshes_without_vertex_color_layer.blend
Added subscriber: @cyaoeu
Added subscriber: @lichtwerk
Can confirm this, this is odd, it doesnt even have to be a shared Material in certain cases, looking more closely now...
Added subscriber: @Sergey
afaics, this was an issue since it was added in
a830280
, cant find the issue within a reasonable amount of time, assigning to original author @Sergey instead...not sure if this a high priority, good news is: wont be an issue in 2.8 (e.g. eevee handles this flawlessly)
If it works fine in 2.8 it's definitely not high priority. An easy workaround is to just add vertex color layers to everything because this bug only affects meshes that don't have vertex color layers.
Changed status from 'Open' to: 'Archived'
This isn't specific to vertex color, same thing will happen for UV maps as well.
There is something changed back in 2015, but bisecting it now is somewhat pointless. The change is most likely in DerivedMesh drawing part, which is being fully removed in blender2.8.
Would rather spend time on making 2.8 production ready!
So thanks for the report, but it will only be fixed when 2.8 is merged to master.