Pivot Painter - Understanding Values corretly

[Abeysaurus]

@Dorian000

@TechArt I realize this post is very old but can’t find much related information elsewhere. When fixing the vertex normals after rotating with world position offset, in this example the corrected normals are plugged into UV4 and 5. Why? Is this normally where vertex normals are stored and automatically accessed for calculation in lighting? Hoping to just plug into UV4 & 5 like this and the lighting/pixel shading pass just works.

If you look at the Normal Input, there are 2 TexCoord nodes being appended and plugged in. The 2 TexCoord nodes have to be set to Coord 4 and 5 (being an old engine version on the screenshot, the node doesnt show the coord number). The custom UVs for channel 4 and 5 are being defined there.
It also depends on the number of UV channels your mesh has, If you look at the example mesh, it already has 4 UV channel (0,1,2,3) and 4,5 are being defined in the material. So the 2 custom channels for the Normal correction will be after the existing channels on the mesh. Hope that helps