I’ve been trying to figure out how this works, but im a bit worried my UV’s might have gotten corrupted somehow and im just going round in circles, either that or im just not getting the whole workflow for multiple UV maps and have made a complete mess of things.

Basically I want to have a diffuse map on UV1, and an ambient occlusion map on UV2, but I cant figure out the whole switching between UV’s thing, it just doesn’t seem to work properly.

Also, when i open them with the Unwrap UVW modifier, the editor shows a front projection of the uvwmap that doesn’t correspond to the actual UVs you see in the 3d viewport (as shown in the first pic below), but when i open the UV’s with renderhjs’s TexTools, it opens them fine, pretty weird.

Standard Unwrap modifier:

TexTools Unwrap modifier

AO lightmap UV’s

I’d really appreciate anyone having a look at it, you can download a sample here:
http://www.esnips.com/doc/e8bdd353-2bd6-43f8-9296-366017d882af/UV_Sample

I’ve tried copying the uv’s from one mesh to another while changing the UV channel to 2 aswell but they just dont seem to work right, please try this if you have a look at the sample and see if it works for you.

thanks in advance,

mike

Your UV layout seems to load fine. I will post some screen-grabs later.

UVW Map Channel switching in UnwrapUVW is no joy in Max.

The most reliable work flow for switching UV channels in Unwrap UVW, in my opinion, is described below posted by a user, torgo000.

torgo3000 27 September 2008 02:42 AM

From what I can tell, the best work flow is to have a Unwrap UVW for each channel you want to edit.  Set the channel number, press reset and then edit only that channel on that Unwrap UVW until you have to collapse.

Otherwise, the workflow is:
Apply Unwrap UVW
Select the channel
Press Reset
Make your edits
Collapse the stack
Repeat for any edit in a different UV Channel

Previous discussions on the topic:

http://area.autodesk.com/for...data-to-channel-1-on-edit

http://area.autodesk.com/for...09/uvw-map-channel-2-bug/

E. K. Anna Hennequet [FA]