Developer Notes

Duplicate of UE-15758


When Saving the Material shown below, the engine will freeze at 50%, no crash is generated but engine stays unresponsive (tested for 60 mins) and must be terminated via Windows Task Manager.

[Image Removed]

The odd behavior is that if the B input to the Fmod node is a Scalar Parameter instead of a Constant 1, freezing does not occur.

This is a regression from behavior in 4.7.6.

Also tested and reproduced in Main Promotable-CL-2599540

Steps to Reproduce
  1. Open QAGame Editor
  2. Create a New Material
    ==Recreating Material pictured in Description==
  3. Take PIxel Depth and Multiply it by a Gradient Texture (Texture2D'/Engine/EngineResources/GradientTexture0.GradientTexture0')
  4. Add a Fmod node
  5. Plug the results of the Multiply into Fmod input A
  6. Add a Scalar Parameter of 1.15
  7. Plug the Scalar Parameter into the Fmod input B
  8. Plug the Fmod Output into Emissive Color (any Material input will cause issue)
  9. Save Material
  10. Convert Scalar Parameter into a Constant 1
  11. Save Material

RESULTS: Engine Effectively Freezes

EXPECTED: Same Shader Compile Times as with Scalar Parameter

Have Comments or More Details?

Head over to the existing Questions & Answers thread and let us know what's up.

Login to Vote

ComponentUE - Graphics Features
Affects Versions4.8.14.9
CreatedJun 25, 2015
ResolvedAug 17, 2015
UpdatedJul 14, 2021
View Jira Issue