Baking Maps from one uv to another reoganized uv

csprance

I have 4 different assets for a project I'm working on. Each one has it's own UV map and a normal map texture at 2048x2048.

What I'm trying to achieve is combining the normal maps of these textures to be baked into one texture with reorganized Uv's



So how would I go about baking these 4 different 2048x2048 normal textures onto this one 1024x1024 map?

csprance

Never Mind i figured it out

For anyone that's interested here are the steps i took
Using X Normal

1. I selected my new model with new uvs as the Lo Poly
2. Set my old model with old uvs as the high definition mesh and selected the normal map as the base texture to bake and checked Base texture is a tangent space normal map.
3. Selected bake base texture under rendering option
4. generate maps
5. Combine using photoshop.

bugo

becareful doing it, if u rotate the uvs it womt work

throttlekitty

It's much better to just re-bake from the high poly again to your new layout.

Fingus

If you just need the Normal Maps you should just bake them out again. If your shells are rotated the normal colors will no longer correspond correctly to world space. This technique however works great for diffuse maps though! We've been using it a lot at work to transfer textures from scanned meshes we made with Autodesk Photofly onto our lowpolies.

csprance

Thanks! Great info. didn't even think of the colors being incorrect. it's nice to be able to adjust the uvs after.

Funky Bunnies

you can rebake the normal map using a normalbump texture type in the shader from your original object -> new object with correct uvs and it should reinterpret the normal map properly if you're using 3ds max. I haven't tried it in maya, but i imagine as long as you're using mentalray it should work fine?

can anyone confirm?

Noors

BAM !
http://www.mentalwarp.com/~brice/normal_shader.php

I don't fully know xnormal, but if he does that :

2. Set my old model with old uvs as the high definition mesh and selected the normal map as the base texture to bake and checked Base texture is a tangent space normal map.

shouldn't it work ?

throttlekitty

Again, just bake from the high poly, there's no reason to complicate things and potentially break the normal map.

Funky Bunnies

true, if your shapes are this simple rebaking is the best idea, but i think there are a lot of situations where knowing how to transfer normal maps to new uvs can be super useful

csprance

Funky Bunnies wrote: »

true, if your shapes are this simple rebaking is the best idea, but i think there are a lot of situations where knowing how to transfer normal maps to new uvs can be super useful

I agree. or any type of map really.