Blenderstorm

Idea #188: Why Blender is using only one UV map per mesh?

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Written by Venthe the 21 Sep 10 at 11:20. Category: Texturing & Materials. Related project: Nothing/Others. Status: Awaiting moderation

Rationale

Currently, Blender allows only one UV to be active/rendered.

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madmesh wrote on the 22 Sep 10 at 12:32

Blender can have multiple UVmaps. What do you mean by rendered? Realtime as in the game engine or pre-rendered? Pre-rendered is possible I have used this.

Venthe wrote on the 23 Sep 10 at 14:28

I know that Blend objects can have multiple UV meshes, but can you unwrap some part of mesh (Eg. head) into one map, and (eg. rest of the body) into another, each map with 2k textures (So the head will be much more detailed) and render BOTH? Still in same object, ofc.

sambler wrote on the 25 Sep 10 at 02:43

I just ran a test to check what does and doesn't work here and I think what you want appears to be possible but there is a bit of a trick to it.

When unwrapping each uvlayout you need to select all and unwrap, then in the uv editor select the verts you don't want effected by this uvlayout. Weld or scale to 0 these verts, move them off the side of the image space and pin them (pinning prevents them from popping back when you re-unwrap). Unwrap again so that only the parts you want effected are laid out in the image.
Adjust the uv's as you want.
Repeat with a new uvlayout for each area you want separated.

In the texture settings set mapping to uv coordinates and layer to the one the image is for (if you don't specify a uvlayout here it uses the layout with the camera highlighted in the uvlayout list). In image mapping set extension to clip - this prevents the image spilling over onto lower textures.

Could this be simplified? maybe.

madmesh wrote on the 26 Sep 10 at 10:03

You can give the faces you unwrap a differen material then the ones you dont unwrap. That way the texture wil only effect the faces that has the material aplied to it. Depending on how many UV layouts you need this usually works.

Samblers method wil work too.

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