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How to create Fresnel graph in material editor?

UMaterialExpressionFresnel* Fresnel = NULL; Fresnel = Cast(CurrentMaterialEditor->CreateNewMaterialExpression(UMaterialExpressionFresnel::StaticClass(), FVector2D(FMath::FRandRange(-1000.0f, 1000.0f), FMath::FRandRange(-1000.0f, 1000.0f)), true, true));

Error 1 error LNK2019: unresolved external symbol "private: static class UClass __cdecl UMaterialExpressionFresnel::GetPrivateStaticClass(wchar_t const )" (?GetPrivateStaticClass@UMaterialExpressionFresnel@@CAPEAVUClass@@PEB_W@Z) referenced in function "class UMaterialExpressionFresnel __cdecl Cast (class UMaterialExpression )" (??$Cast@VUMaterialExpressionFresnel@@VUMaterialExpression@@@@YAPEAVUMaterialExpressionFresnel@@PEAVUMaterialExpression@@@Z) E:_workspace_\UE4\PYC_Plugin_05\Intermediate\ProjectFiles\EditMaterial.cpp.obj PYC_Plugin_05

Product Version: UE 4.8
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asked Sep 30 '15 at 04:56 AM in C++ Programming

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pengyancai
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