Is it possible to access a node from the Material Editor from a C++ script?
I'd like to be able to change the value of 'Mulitply' from a script.
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\$\begingroup\$ It sounds to me like you might want to make a Material Parameter out of your multiplication coefficient. \$\endgroup\$DMGregory– DMGregory ♦2021-08-27 20:23:56 +00:00Commented Aug 27, 2021 at 20:23
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\$\begingroup\$ Thank you! I will look right into it. \$\endgroup\$I_Keep_Trying– I_Keep_Trying2021-08-27 20:25:31 +00:00Commented Aug 27, 2021 at 20:25
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1 Answer
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In your Material, create a Scalar Parameter (hold 1 on the material grid and left click), name it and plug it in to your multiply node.
In your C++ header, create an instance variable and set it as a UPROPERTY so it doesn't get garbage collected.
UPROPERTY()
UMaterialInstanceDynamic* DynMat;
In your C++ constructor, set the dynamic material instance from the existing material on your mesh then set it to your mesh.
DynMat = UMaterialInstanceDynamic::Create(YOURMESHNAME->GetMaterial(0), this);
YOURMESHNAME->SetMaterial(0, DynMat)
The 0 in the get and set refer to which Element of the mesh the material is set to. If 0 is the back of the card and 1 is the front, change the code accordingly.
From here, you can use the DynMat reference to change your parameter values as follows.
MI->SetScalarParameterValue(TEXT("YourMultiplierName"), NewFloatValue);
YourMultiplierName must match exactly what you put in for the name of the parameter in the material grid, otherwise this won't work.
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\$\begingroup\$ thanks mate. I did already get it working due to DMGregory's help, but nice to have it all typed up with example. I would upvote but I don't have enough rep \$\endgroup\$I_Keep_Trying– I_Keep_Trying2021-08-31 19:51:42 +00:00Commented Aug 31, 2021 at 19:51