Unreal Engine Issues

UE-21064

Light Functions displayed on Large Translucent Meshes cause rendering errors

Light Functions displayed on Large Translucent Meshes cause rendering errors

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

Light Functions are stretching and flickering on large translucent surfaces.

Translucents Surface:
[Image Removed]

Opaque Surface:
[Image Removed]

Steps to Reproduce
  1. Create a New Blank Project with No Starter Content
  2. Import the Attached T_LightFunction.tga file
  3. Create a Light Function Material with T_LightFunction assigned to Emissive Color
  4. Create a New Surface Translucent Material with the following specifications:
    -Base Color = 0.25,0.25,0.25
    -Metallic = 0
    -Roughness = 1
    -Opacity = 1
  5. In the Level Viewport, Select the Default Template Floor and set the scale to (50,50,1) OR Add a Landscape to Fill World
  6. Assign the Surface Translucent Material to the Template Floor (or Landscape)
  7. Assign the Light Function to the Directional Light
  8. Set the Light Function Scale to 8192,8192,8192

RESULTS: Stretching and flickering occurs outside what could be the Translucent Lighting Volume Dimensions

EXPECTED: No Stretching and Flickering

Quick Repro in Attached Project, just Open

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Fixed
ComponentUE - Graphics Features
Affects Versions4.8.3, 4.9
Target Fix4.24
Fix Commit9960707
Main Commit9960708
Release Commit9960707
CreatedSep 14, 2015
ResolvedNov 1, 2019
UpdatedSep 19, 2021