Principled Shader Roughness differs from Linux/OSX to Windows 10 #52093
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Reference: blender/blender#52093
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System Information
Xubuntu 14.04 / OSX 10.11.6 / Windows 10
Blender Version
Broken: all tested Windows 10 64bit builds till today
Short description of error
While under linux and OSX squared roughness values are used in the Principled BDSF, Windows builds use unsquared values.
Exact steps for others to reproduce the error
Just build a nice glossy Material and render it on different Operation Systems.
Changed status to: 'Open'
Added subscriber: @ronalde
Added subscriber: @brecht
Are you absolutely sure you compared the same .blend file on different operating systems, with the same blender version? This seems like a very unlikely bug to happen only on some operating systems. Note that the Principled BSDF and Glossy BSDF use a different roughness.
Changed status from 'Open' to: 'Resolved'
We figured it out - its a problem with file paths. We use textures (which affect roughness) linked from different volumes. So .blend files saved in one OS dont work well when opened in another OS. I guess we had to change the way where we store our textures ... should be at least on the same volume so that relative paths will work.
Sorry for the wrong bug report and thanks for the fast reply!