Unreal Engine Issues

UE-29062

Behavior of Speed Up/Down parameter of Auto Exposure are different.

Behavior of Speed Up/Down parameter of Auto Exposure are different.

Developer Notes

This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.

UDN
Description

Brend/Swtch multi PostProcessVolume to handle Auto Exposure with same Speed Up/Down parameter but behavior of Speed Up/Down parameter of Auto Exposure are different.

Scene with.
Unbounded PostProcess Volume with Speed Up 0.1, Speed Down 0.1, Exposure Bias 0.0.
Small bound PostProcess Volume with Speed Up 0.1, Speed Down 0.1, Exposure Bias -6.0.

Thanks!

Steps to Reproduce

Test case #1.

  1. Open ExposureVolTest411.uproject with 4.11
  2. Open level "ExposureTestMap"
  3. Play
  4. Move to Center Square area near "Sub Volume Priority 1" text, then scene goes darker slowly.
  5. Move out from Center Square, then scene goes brighter quickly.

Test case #2.

  1. Hit ESC key to level edit mode.
  2. Check "HDR (Eye Adaptation)" of Visualize of Show on the view.
  3. Move camera to center square, then visualized graph bar moves slowly.
  4. Move camera back to original position, then visualized graph bar moves quickly as jumping value.

It seems clamping if using Speed Up parameter, but not clamping with Speed Down.

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Won't Fix
ComponentUE - Graphics Features
Affects Versions4.10
CreatedApr 5, 2016
ResolvedFeb 14, 2017
UpdatedApr 27, 2018