Description

Using Shader Model 5 and tessellation on Linux gives strange results that are not present when used on Windows

ex:
1) When using Shader Model 5 on Linux, turning on Translucent blend mode and Tessellation causes the material preview to flicker.
2) Lit material with tessellation does not cast shadows from dynamic world light (sun)

Steps to Reproduce
  1. Open UE4 editor with SM 5 enabled (./UE4Editor -opengl4 in terminal)
  2. Create a new Material in the content browser
  3. Hold 3 and left click to create a vector3 node
  4. Wire Verctor3 node into Base color
  5. with material inputs node selected, edit the following properties of the detail panel
    • Set Blend Mode to Translucent
    • Set Tessellation to Flat Tessellation

Result:
Material preview begins to flicker wildly.

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Fixed
ComponentPlatform - Linux
Affects Versions4.12.4
Target Fix4.15
Fix Commit3226542
Main Commit3233813
CreatedJul 6, 2016
ResolvedDec 8, 2016
UpdatedApr 27, 2018