Operating system: Windows 10 x64
Graphics card: Nvidia GTX 1060 (laptop)
Broken: 2.80, 91a155833e59, blender 2.8, 2019-01-07
Short description of error
When using Principled BSDF to make a metallic material and then enabling Motion Blur, seeing the rendered view in viewport shows heavy distortions in material appearance (renders out fine, though). Disabling or unchecking either "Motion Blur" or "Screen Space Reflections" in render settings fixes the issue and the distortions disappear.
When in rendered mode in viewport, that material would appear without distortions regardless of whether motion blur is checked or not.
Here is a screenshot example with motion blur enabled: https://www.dropbox.com/s/hd7t29ok6hwvkrc/scene%20with%20motion%20blur.jpg?dl=0
And here is a screenshot example with motion blur disabled: https://www.dropbox.com/s/bpd29dgsj4jr5kh/scene%20without%20motion%20blur.jpg?dl=0
Exact steps for others to reproduce the error
- Create new general blender project
- Go to default cube's Principled BSDF material settings and make metallic by turning up metallic parameter to 1.0
- Enable "Motion Blur" and "Screen Space Reflections" in render settings
- Press "Z" key and switch viewport mode to "Rendered", then press "NUMPAD 0" key to look through camera