Material Node getting Texture2D in not compatible with Float

Development Cinematics & Media
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1

I’m trying to use the following to build my Material Node in c++:

https://dev.epicgames.com/documentation/en\-us/unreal\-engine/custom\-material\-expressions\-in\-unreal\-engine?application\_version\=5\.4

But I’m getting the following error: Texture2D in not compatible with Float

And I can’t connect the texture node. Please also see attached error.

Attached is the code.

Thank you.

Hanna

2

Hello there,

The reason the custom expression believes everything is a float is because the default return value of UMaterialExpression::GetInputType is MCT_Float1.

What you are missing is an override on that function that specifies the types of the inputs you are using. I’ve provided an example below.

uint32 UFSCS_TextureBlur::GetInputType(int32 InputIndex) { if (InputIndex == 0) { return MCT_Texture2D; } return MCT_Float1; }I’ve chosen Texture2D as the sample type won’t work on all texture types.

As an aside, the return type is CMOT_Float4 but blur is a float3. There isn’t an automatic promotion from float3 to float4, so this doesn’t compile without that amendment.

Best regards,

Chris

3

Thank you for you help. That was it.

Thank you.

Hanna

4

You’re very welcome.

If you have any questions, please feel free to ask. Otherwise, would you mind if I close out this case for now?

Best regards,

Chris

5

You can close.

Thank you for your help.

Hanna

6

Will do.

If you have any other questions, please feel free ask.

Best regards,

Chris