Unreal Engine Issues

UE-21912

Crash on Exiting or Starting PIE with Weight Blended Landscape on ES2 Preview Level

Crash on Exiting or Starting PIE with Weight Blended Landscape on ES2 Preview Level

UDN
Description

When you are in Rendering Preview Level ES2 (Mobile/HTML) and have a level which has a landscape with weight-blended layered material painted on, PIE will crash on Start of or Exit from.

[Link Removed]

From Crash Reporter Descriptions:

  • UE4QA - Eric K. - Crash on Exiting PIE with Landscape Weight Blended in ES2 Preview Level
  • Stop after PIE in mobile preview
  • Stop while in mobile preview
  • Still crashing while in mobile PIE and hitting ESC to quit.
  • Stop play
  • End a PIE session in a new window while using ES2 feature level preview.
  • Sent in the unattended mode
Steps to Reproduce
  1. Open a Blank Project with No Starter Content
  2. Create a Material called M_Landscape
  3. In M_Landscape, assign 3 different textures to three Weight Blended Layers
  4. Save and Compile Material
  5. In Level, Add a Landscape with default settings
  6. Assign M_Landscape to the Landscape in the level
  7. Create Layer Info for the 3 layers
  8. Paint any amount of blending between the three layers on the landscape
  9. Switch to Rendering Preview Level ES2 (Mobile/HTML)
  10. PIE in selected Viewport
  11. End PIE

RESULTS: CRASH (Sometimes I have experienced on successive tests on Starting PIE as well)

EXPECTED: No Crash

Quick REPRO Open Attached Project, set Preview Rendering Level to ES2 (Mobile/HTML) and PIE

Callstack
UE4Editor_Engine!UPrimitiveComponent::FinishDestroy() [primitivecomponent.cpp:873]
UE4Editor_CoreUObject!UObject::ConditionalFinishDestroy() [obj.cpp:685]
UE4Editor_CoreUObject!IncrementalPurgeGarbage() [garbagecollection.cpp:1019]
UE4Editor_CoreUObject!CollectGarbageInternal() [garbagecollection.cpp:1383]
UE4Editor_CoreUObject!CollectGarbage() [garbagecollection.cpp:1400]
UE4Editor_UnrealEd!UEditorEngine::EndPlayMap() [playlevel.cpp:327]
UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:978]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:366]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:2428]
UE4Editor!GuardedMain() [launch.cpp:142]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:126]
UE4Editor!WinMain() [launchwindows.cpp:200]

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Cannot Reproduce
ComponentUE - LD & Modeling - Terrain - Landscape
Affects Versions4.9
CreatedOct 8, 2015
ResolvedJun 27, 2016
UpdatedJul 14, 2021
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