Trouble connecting textures to uv maps

[deformative]

I cant get my bump maps connected to the right uv maps. I tried using the uv-centric relationship editor but it seems the only texture i can link are the ones for the color node. I also tried manually connecting the 2dplacement node to the uvchooser node in hypershade but that didnt work either.

So basically i can get my color textures linked correctly but all the other textures (bump, transparency etc.) keep using the default set of uv's, and dont show up as a choice in the uv centric relationship editor.

If anyone has had this proplem please help me out, as im really stuck on this one.

thanks,

[joojaa]

bump maps cant use mutliple uvs sorry its a known limitation in maya (ther migt be a way around this but never bothered to explore it)

[deformative]

thx Joijaa, but im not sure you understand my problem

im not trying to use something like a multi-textured bump, i just want to link my bump to the correct uv set. the color map i can always link to my new uv set with the relationship editor but i never have the option to link the bump map. its like the color map, it uses the default uv's until you explicitly tell it to do otherwise, but i cant find how to link the bump.
all i did was to create a new uv set for a part of the model, then i link the color map to the new uv set, but the other maps stay linked to the original default set, and i cant find and option to link them in either the uv relationship editor or hypershade
thanks for the help though,
let me know if that makes it any more clear
deformative

[sunil_born2win]

Hello,

Jooja doesn't even speak of multiple bump maps. In Maya, you CANNOT connect bump maps to other UV sets than the default one. As he says, it's a known limitation, and there's no workaround for it, that's the reason why most of the people do not use UV sets ... You should reconsider your mapping, using only the default UV set.

[deformative]

wow, thats surprising to me, thank you both very much for the help

deformative

[deformative]

heh... i do have another question though now, how do you guys organize complicated multi-part models if all your uv projections are on the same 0-1 coordinates?, how do you manage uv snapshots and such? also how would you select to see the mapping of just a certain projection?

thanks a lot, this was very helpfull

deform

[joojaa]

theres a auto distribution command in maya that automaicaly places objects either vericaly horisontaly ont a square in0 to 1 space or whatever it even takes into account the resolution of your maps.

Sometimes just sometimes its usefull to use space thats beyond 0 to 1 too for all those nice texturing tricks up un my sleeve (its easier to reposition individual maps thisway, you tend to remember 1 to 2 better than 0.75 to 1)

[deformative]

thanks, but im a little confused

its seems to me that if you have a complicated model you might end up with 20,30, or 50 or more projections, as it would be easier to break a complicated model into smaller, more organized textures. im wondering if you base uv projections on model objects or model materials or what. it just seems very difficult to organize a complicated model around a system without uv sets.

thanks again

deform

[deformative]

also,

im a little confused about the auto distribution you mentioned.....how does it take into account your map size when i would think map size is only based on a uv snapshot of a projection, im under the impression that projections are resolution-less.......and that the snapshot is where a resolution comes into play as it is when a 2d image is applied.

thank a lot,

deform

[joojaa]

Well it places the parts so that edges snap as closely to a pixel size. If you need many parts then just map them all in the same uv no matter what (you can still say that this map only affects space so and so), also theres nothing wrong with assigning different materials to different parts. theres no need for separate uvs for separate pars unless you need two different kind of projections for some reason. But in theese cases you can use projections and texture reference objects.

PS. in future put your posts in respective category (this is for the render forum), yoll get faster answers that way (atleast after i stop idling on the net next week).

[sunil_born2win]

For my part, when mapping, let's say a high def poly character, I assign different materials to main character parts : head, neck, torso, arms, and so on. After that, I treat separately each part, doing UVs and projecting as much as I need, in order to have the head in a whole UV space. For each part assigned with the same material, I place it and tweak UVs, so that it fills a different UV space. Then I do all my UV snapshots (moving UVs with the move component tool), and can after that easily adapt texture files size according to my expactations (camera close ups ...). For all the UVs, always try to have them fill as much as possible an UV space, as space not covered by UVs is as much pixels loaded in Maya for nothing (and RAM by the same way when rendering). So doing a correct mapping is a hard compromise to get, between cuttign UVs and preventing too much seams, and having them fill the UV space. One of the most important thing, also, is to keep all the UVs proportionnal in scale in the same UV space. Hope this helps.

Alban

[deformative]

cool, thanks everyone