Developer Notes

For By Design explanation, see AnswerHub post

Description

Given two Material Instances of one material applied both to a Blendables Array only the second (last applied) will be applied to the post process volume.

With the same setup, two Materials will stack the effects of each blendable.

With Materials:
[Image Removed]

With Material Instances:
[Image Removed]

Also Reproduced in Main Promotable-CL-2487422

Assets and Level for Testing added in CL-2489498

Steps to Reproduce

Assets and Level for Testing added in CL-2489498

  1. Open QAGame Editor
  2. Open World'/Game/Developers/EricKetchum/Mat_Inst_PP/Mat_Inst_PP.Mat_Inst_PP'
  3. Enable Post Process Volume in Level marked Using Materials
  4. Disable Post Process Volume in Level marked Using Materials
  5. Enable Post Process Volume in Level maked Using Material Instances

RESULTS: (See Attached Images) PPVs are rendering different results of blendables

EXPECTED: Both PPVs should render exactly the same.

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By Design
ComponentUE - Graphics Features
Affects Versions4.7.34.8
Target Fix4.9
CreatedMar 24, 2015
ResolvedJun 15, 2015
UpdatedApr 27, 2018