Operating system: Windows 10 x64
Graphics card: Nvidia Quadro M2000 - 12248 MB of available graphics memory (4096 Dedicated Video Memory)
Broken: blender2.8, 2018-12-03
Short description of error
Materials turn black randomly and stay that way. Very difficult to get them back displaying properly again.
Also, exports transparent materials to FBX (rendered as transparent material when importing to Unity 2018.3...)
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
- Delete the startup cube.
- Extract to desktop and Import this .dae file: https://www.models-resource.com/wii/bombermanblast/model/2349/
- Use scale tool and scale down to ~2m tall (using incremental scale)
- Click around, change selections, and zoom camera around model; Change between the various new shading modes and transparency in the Layout viewport.
- Hop to the UV Editor tab, then back to main Layout tab (back and forth), maybe click on the bones/armature in the outliner in the Layout and do various selections
Eventually the materials will turn black.
It will be very difficult to get them back to displaying correctly without reimporting the images -- and sometimes not even then.
It appears to be at random, and only sometimes can you get the materials back before they disappear again after switching tabs to the UV Editor.
Tweaking the Principled BDSF "Base Color" property of the second material to "Image Texture" and swapping between linked materials/textures eventually causes a crash.