Unreal Engine Issues and Bug Tracker (UE-50781)

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Description

Lightmass is crashing when using a material that has "Cast Shadow as Masked" set to true in its properties.

Found in 4.18 P3 CL#3676890

Unable to reproduce in 4.16.3 CL# 3561208 and 4.17.2 CL#3658906, this is a regression.

Steps to Reproduce

Create a blank project
Create a new material
Apply new material to floor mesh
build lighting
open new material
in the material properties, under Lightmass Settings, check "Cast Shadow as Masked"
save the material
build lighting

result: lightmass crashes
expected: lighting built successfully

Callstack

<None> === Lightmass crashed: ===Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000002
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000002

0x000000001E8FD340 UnrealLightmass-Core.dll!UnknownFunction []
0x0000000047014E6C UnrealLightmass.exe!UnknownFunction []
0x0000000047013BA8 UnrealLightmass.exe!UnknownFunction []
0x000000001F4F6FAC embree.dll!UnknownFunction []
0x000000001EF38AD0 embree.dll!UnknownFunction []
0x00000000470294E4 UnrealLightmass.exe!UnknownFunction []
0x000000004707BEBF UnrealLightmass.exe!UnknownFunction []
0x000000004707B892 UnrealLightmass.exe!UnknownFunction []
0x000000004709D158 UnrealLightmass.exe!UnknownFunction []
0x000000001EB86AEC UnrealLightmass-Core.dll!UnknownFunction []
0x000000001EB776B3 UnrealLightmass-Core.dll!UnknownFunction []
0x00000000314413D2 KERNEL32.DLL!UnknownFunction []
0x00000000335D54E4 ntdll.dll!UnknownFunction []
0x00000000335D54E4 ntdll.dll!UnknownFunction []

Community References

Lightmass Crash in 4.18 P1

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Fixed

Component	UE - Graphics Features
Affects Versions	4.18
Target Fix	4.18

Fix Commit	3681973
Release Commit	3681973

Created	Oct 4, 2017
Resolved	Oct 5, 2017
Updated	Apr 27, 2018

UE-50781

Lightmass crashes when lighting is built with material that has "Cast Shadow as Masked"

Lightmass crashes when lighting is built with material that has "Cast Shadow as Masked"

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