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link error: LinkGraphNodesFromMaterial unresolved external symbol


I need the function LinkGraphNodesFromMaterial to update a graph in my plugin. However, during build, it reports:

error LNK2019: unresolved external symbol "public: void __cdecl UMaterialGraph::LinkGraphNodesFromMaterial(void)" (?LinkGraphNodesFromMaterial@UMaterialGraph@@QEAAXXZ) referenced in function "void __cdecl LinkToColorImage(class IMaterialEditor ,struct FColorMaterialInput &,class UTexture ,enum EMaterialSamplerType)" (?LinkToColorImage@@YAXPEAVIMaterialEditor@@AEAUFColorMaterialInput@@PEAVUTexture@@W4EMaterialSamplerType@@@Z)

I have set my plugin Type to editor.

I have included "MaterialGraph/MaterialGraph.h"

I have added "UnrealEd" module to dependencies.

But no work, and it seems that all the MaterialGraph function related objs are not linked.

Any ideas? Thanks!

PS: My full list of refed modules is : PublicDependencyModuleNames.AddRange(new string[] { "Engine", "Core", "LevelEditor", "Slate", "EditorStyle", "XmlParser", "ImageWrapper", "CoreUObject", "UnrealEd", "MaterialEditor", "DesktopPlatform"});

Product Version: UE 4.8
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asked Aug 03 '15 at 11:27 AM in C++ Programming

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avatar image MilosBulatF Aug 03 '15 at 11:37 AM

I noticed that MaterialGraph has a tag "MinimalAPI", so that the LinkGraphNodesFromMaterial can not be called.

How can I do the same thing without calling this function?

I was just following: https://github.com/EpicGames/UnrealEngine/blob/master/Engine/Source/Editor/MaterialEditor/Private/Tests/MaterialEditorTests.cpp#L48

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1 answer: sort voted first

I have found an alternative way to achieve the link and update by using MaterialExpression and PostEditChange

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answered Aug 03 '15 at 03:11 PM

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avatar image pengyancai Aug 28 '15 at 06:35 AM

hello,Do you solve this problem?

avatar image MilosBulatF Aug 28 '15 at 09:11 AM

Yes and it is a work around. LinkGraphNodesFromMaterial is by design can not be used.

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