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When "Motion Blur" is turned on, materials look distorted in Viewport
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Description

System Information
Operating system: Windows 10 x64
Graphics card: Nvidia GTX 1060 (laptop)

Blender Version
Broken: 2.80, 91a155833e59, blender 2.8, 2019-01-07

Short description of error
BEHAVIOR
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.

EXPECTED BEHAVIOR
When in rendered mode in viewport, that material would appear without distortions regardless of whether motion blur is checked or not.

SCREENSHOT EXAMPLES:
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

  1. Create new general blender project
  2. Go to default cube's Principled BSDF material settings and make metallic by turning up metallic parameter to 1.0
  3. Enable "Motion Blur" and "Screen Space Reflections" in render settings
  4. Press "Z" key and switch viewport mode to "Rendered", then press "NUMPAD 0" key to look through camera

Details

Type
Bug

Event Timeline

This comment was removed by TravLR (TravLR).
TravLR (TravLR) updated the task description. (Show Details)
TravLR (TravLR) updated the task description. (Show Details)
Jacques Lucke (JacquesLucke) triaged this task as Incomplete priority.Thu, Jan 10, 11:20 AM

Thanks for the report.
Could you upload the screenshots directly here instead of linking to dropbox, please?
Also, could you prepare a simple .blend file that clearly shows the issue?