Unreal Engine Issues and Bug Tracker (UE-44519)

Description

Crash that occurs when applying a masked material (with LandscapeLayerBlend and LandscapeVisibilityMask) to a Landscape's material slot.

This is a regression:
broken in 4.16.0 CL 3405315
worked in 4.15.1 CL 3348071

Steps to Reproduce

open the editor
make a new material and open it
add two Constant 3Vector nodes
add a LandscapeLayerBlend node, in its details panel click the + twice to add two layer inputs
Connect the two 3Vectors into the LandscapeLayerBlend, and connect that to Base Color
add a LandscapeVisibilityMask node, connect it to Opacity Mask
change the material's Blend Mode to Masked
Apply, Save, and close the material
Change the Editor to the Landscape Mode
Apply your new material to the Material slot

Result: Editor crashes

Callstack

Fatal error: [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialShared.cpp] [Line: 1851] Couldn't find Shader FHitProxyVS for Material Resource landscapeVisibilityMask! RenderMeshShaderMap 1, RenderThreadShaderMap 1 GameMeshShaderMap 1, GameThreadShaderMap 1, bShaderWasFoundInGameShaderMap 0 With VF=FLocalVertexFactory, Platform=PCD3D_SM5 ShouldCache: Mat=0, VF=1, Shader=1 MaterialUsageDesc: LightingModel=MSM_DefaultLit, BlendMode=BLEND_Masked, Spec

UE4Editor_Engine!FMaterial::GetShader() [materialshared.cpp:1838]
UE4Editor_Renderer!FHitProxyDrawingPolicy::FHitProxyDrawingPolicy() [scenehitproxyrendering.cpp:180]
UE4Editor_Renderer!FHitProxyDrawingPolicyFactory::AddStaticMesh() [scenehitproxyrendering.cpp:325]
UE4Editor_Renderer!FStaticMesh::AddToDrawLists() [scenecore.cpp:327]
UE4Editor_Renderer!FPrimitiveSceneInfo::AddStaticMeshes() [primitivesceneinfo.cpp:152]
UE4Editor_Renderer!FPrimitiveSceneInfo::AddToScene() [primitivesceneinfo.cpp:195]
UE4Editor_Renderer!FScene::AddPrimitiveSceneInfo_RenderThread() [rendererscene.cpp:511]
UE4Editor_Renderer!<lambda_0628b7e343e078d62bb69bb7a0b80e2d>::operator() [rendererscene.cpp:780]
UE4Editor_Renderer!TGraphTask<TEnqueueUniqueRenderCommandType<`FScene::AddPrimitive'::`2'::AddPrimitiveCommandName,<lambda_0628b7e343e078d62bb69bb7a0b80e2d> > >::ExecuteTask() [taskgraphinterfaces.h:883]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:954]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:701]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:327]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:461]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]

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Fixed

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.16, 4.17
Target Fix	4.16

Fix Commit	3424995
Release Commit	3424995

Created	Apr 28, 2017
Resolved	May 5, 2017
Updated	Oct 30, 2017

UE-44519

Crash when applying a LandscapeVisibilityMask material to a Landscape's material slot

Crash when applying a LandscapeVisibilityMask material to a Landscape's material slot

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