2 UV channel problem (possible corrupt UVs :( )
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
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
Replies
2. Are you assigning Material IDS?
If no to eother one of those it will not work and you need to make sure if youre using to 2 uv channels say for UE3 then you need to make sure you have 2 unwraps on your object and you change the UV channels.
It looks like your AO UVs are also on channel 1...are these on a different model? If so, save out the UVs and then load them into channel 2 of your first model. In general, though, you shouldn't transfer UVs from one mesh to the other because sometimes you can add an extra vert or otherwise fuck up the vert order and it will not save/load the UVs nicely.
You're material is set to use UV channel 1, change your material to 2 (or whatever channel your good UVs are on) and it should display correctly.
cheers!
To switch between UV channels you toggle that channel setting. Sometimes UV1 shows up when you switch to UV2 just hit reset UV's and it will bring up the correct lay out.
Is this what you are trying to do here? Did you manage to do it?
This looks like a case of 'max is stupid'. It took me a while to figure this out too after coming from the world of maya where uvs are handled so much better.
After changing to channel 2 in the edit uvw panel, you need to hit the 'reset uvw' button before clickign the edit uvs button to open the editor. It will throw a warning about destroying something, ignore it because it's meaningless. Renderhjs' textools do this for you automatically, thats why that warning comes up when you click open uv editor and have something other than uv channel 1 selected.
yeah i managed to do it, basically i've got 2 different UV channels on one mesh, UV channel 1 has the stacked UV's with the diffuse, normal and specular etc... and UV channel 2 has totally unique UVs, which is where im baking the AO onto, you just need to select UV channel 2 in the render to texture dialogue, its almost, pretty much the same process as baking a light map.
keep in mind that having a second UV channel doubles or sometimes even triples your vert count, or so i've been told.
@glib; yeah i've been using max for almost 10 years now, i usually find enough info online to solve a problem im having, but this had me completely stumped, lol.
@renderhjs; thanks for making UV unrapping less of a shitty job