Unreal Engine Issues

UE-45739

Crash on Mac when adding Convex Collision to a mesh converted from a brush

Crash on Mac when adding Convex Collision to a mesh converted from a brush

Description

This is one of the top Mac crashes occurring in 4.16. Caused by adding Auto Convex Collision to a mesh converted from a brush. Does not occur on Windows.

User Descriptions

  • I was trying to add a convex collision component to a box brush that i converted into a static mesh for faster rendering...When I tried applying 6 to the almost .9 accuracy on the collision creation, the program crashed again, 2 times in a row over the same collision creating issue.
    I would like to ultimately know how to add a proper blocking volume on imported meshes and converted brushes into static meshes that have very good bocking volumes...
    I also would like to be ab
Steps to Reproduce
  1. Open UE4 Editor (Any Project) on Mac
  2. Open Modes->Geometry
  3. Add Box brush to the viewport
  4. In Details Panel, convert brush to static mesh
  5. Open mesh in Mesh Editor
  6. Collision->Auto Convex Collision
  7. Click Apply under Convex Decomposition

Result:
Editor immediately closes

Expected:
Convex collision settings are updated and applied

Callstack
UE4Editor-UnrealEd.dylib!void VHACD::VHACD::AlignMesh<float>()
UE4Editor-UnrealEd.dylib!bool VHACD::VHACD::ComputeACD<float>()
UE4Editor-UnrealEd.dylib!DecomposeMeshToHulls()
UE4Editor-StaticMeshEditor.dylib!FStaticMeshEditor::DoDecomp()
UE4Editor-StaticMeshEditor.dylib!SConvexDecomposition::OnApplyDecomp()
UE4Editor-StaticMeshEditor.dylib!TBaseSPMethodDelegateInstance<false, SConvexDecomposition, (ESPMode)0, FReply ()>::Execute()
UE4Editor-Slate.dylib!SButton::OnMouseButtonUp()
UE4Editor-Slate.dylib!FSlateApplication::RoutePointerUpEvent()
UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseButtonUpEvent()
UE4Editor-Slate.dylib!FSlateApplication::OnMouseUp()
UE4Editor-Core.dylib!FMacApplication::ProcessEvent()
UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents()
UE4Editor-Slate.dylib!FSlateApplication::TickPlatform()
UE4Editor-Slate.dylib!FSlateApplication::Tick()
UE4Editor!FEngineLoop::Tick()
UE4Editor!GuardedMain()
UE4Editor!<Unknown>
UE4Editor-Core.dylib!<Unknown>
Foundation!Unknown()
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>

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Fixed
ComponentUE - Platform - Apple
Affects Versions4.16
Target Fix4.16.2, 4.17
Fix Commit3499527
Main Commit3617655
Release Commit3536044
CreatedJun 6, 2017
ResolvedJun 19, 2017
UpdatedApr 27, 2018
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