I do not know what happen here and I need the help of the rendering team to debug this issue. There is no log at all even with -d3debug

If you import the file SK_LOD_Morph_Working.fbx its a similar setup in Maya but its working fine in both CPU and GPU vertex factory.

Steps to Reproduce

Import the attach file SK_LOD_Morph_Broken.fbx with the following options to true

  • "Import Morph Targets" option to true
  • "Import Mesh LODs" option to true
  • "Create materials" selected

open the skeletalmesh

change the morph slider name fat to 1.0

switch LOD from 0 to 1 and to 2

show the normal (this will switch to CPU skin vertex factory)

switch LOD from 0 to 1 and to 2

RESULT: in GPU vertex factory only the LOD 0 morph are working, In CPU vertex factory all LOD moprh are working

EXPECTED: The morph is working on all LOD in GPU or CPU vertex factory

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There's no existing public thread on this issue, so head over toAnswerHub just mention UE-85965 in the post.

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ComponentRendering - RHI
Affects Versions4.
Target Fix4.25
Fix Commit11172426
Main Commit11205265
CreatedDec 17, 2019
ResolvedJan 30, 2020
UpdatedFeb 13, 2020