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Preparing your Mesh

Import your FBX into Blender and duplicate it. Because you only want to export the modified mesh, create a new collection and hide the original mesh inside it.

Create Collection

Add a "DataTransfer" modifier and copy the normals of the original mesh.

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Afterwards disable the collection with your original mesh inside by clicking the checkmark.

If you want your whole object to use the shader:​

Select your mesh and go into edit mode (TAB). Afterwards select everything with the A key. Then go to Mesh -> Split -> Faces by Edges

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If you only want parts of your avatar to use the shader:​

Then create a material and apply it to all of the parts you want to have the shader applied to.

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Then select the mesh again, select all of the faces you applied your material to and go to Mesh -> Split -> Faces by Edges

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Finally export your FBX to Unity. You'll probably want to select "FBX All" as scaling.

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