transfering Normal maps betweek UV setups

Dylan Brady

Hey, Im about at my wits end with this one.
Im taking several models with there own Normal maps and baking them down to one master normal map with re-arranged UVs.
When I bake them as a diffuse theres obviously problems because the tangent space has changed.

Anyone have any experience trying to do this?
Anyone even know what Im saying?

Ghostscape

Don't bake them as diffuse. Bake them as normals.

I had to combine a bunch of outsourced props that were spread over a bunch of (terribly thought out) texture atlases onto a single sheet. Bake the diffuse map and spec maps as diffuse (max specular bakes do not bake a specular color/power map), but bake the normal maps out as normals. You might need to dupe the meshes and bake from one to the other for normals, i forget (stick a slight push modifier on the low poly and offset it the tiniest of bits so they aren't 100% co-planar or you'll get weirdness).

ablaine

Interesting. I had no idea you could bake a low poly model (or models) with a normal map to a low poly with a different set of UVs... This is also possible using xnormal? That could be definitely be useful in some cases.