Head UV Layout

Mr. Bean

Hello,

Is this a good UV Layout for a head?



The character is a low poly real time model, so he won't have any facial animation.

Thanks for any tips or comments!

Tom Ellis

I'm not an expert at character unwrapping, and without seeing your model I can't say for 100% certain, but I would expect to see a lot of texture distortion along the top and back of the head with that layout.

Two things I'd suggest, firstly, did you use pelt mapping? If not, try it and you should get a better result along the centre seam, and secondly, if your character is gonna have a symmetrical face texture then you could split that layout down the middle and mirror it.

People with more experience will be able to offer better advice but those're my two cents.

Mr. Bean

Ah, you're right; with a checker texture applied there is awful distortion on the top of the head, but I hadn't known how to fix this. I'll take your advice and mirror the UVs.

I'll give pelt mapping a shot, but I haven't used it much before.

Thanks!

Mark Dygert

Hey look a polar bear in a snow storm!

Kidding aside:
The areas that are sucking up the most texture space are the least important areas. It can be helpful to relax the important areas, and minimize/stretch the unimportant areas giving you room for the face and other stuff, like eyes, teeth, mouth, tongue. Also keep in mind that since this isn't animated you could probably stuff this on the body sheet, maybe even mirroring the face...

yiannisk

Try this,

Cut the head in the back (create UV seams that is) all the way up towards the top of the head pretty much like you did.
Use Pelt mapping to get a more natural and even spread of the head surface.

this is an old but still valid tutorial.
[ame]http://www.youtube.com/watch?v=NjqY8i_-Xe0[/ame]

cheers!

Mr. Bean

Vig wrote: »

Hey look a polar bear in a snow storm!

Weirdest polar bear I've ever seen...

Vig wrote: »

...It can be helpful to relax the important areas, and minimize/stretch the unimportant areas giving you room for the face...

I've heard about that, but for some reason when I relax the face it crumples up horribly and causes heavy distortion...would using a really small value in the relax dialog fix this?

Vig wrote: »

and other stuff, like eyes, teeth, mouth, tongue.

Sadly, this fellow doesn't have anything in his mouth.

Thanks a ton, yiannisk, I'll give that tutorial a try!

Here's the head if you're interested (remember though, this is meant to be low poly and for real time games, and the topology is not as important as it would be if the head were to be animated; I probably won't be making any changes to it except little tweaks):



Thanks

ParoXum

Soft selection + relax important areas = Win

Mark Dygert

Mr. Bean wrote: »

Weirdest polar bear I've ever seen...

Gray wires, on a gray/dark gray checker background = about as visible as a polar bear in a snow storm. /rimshot

Mr. Bean wrote: »

I've heard about that, but for some reason when I relax the face it crumples up horribly and causes heavy distortion...would using a really small value in the relax dialog fix this?

The mesh could be inverted.

In face/poly mode in the UV editor go Select > Select Inverted. It will highlight whatever needs to be flipped (using the Mirror tool in the UV editor).

Also try relaxing by face angles instead of edge angles. The soft select trick PoroXum mentioned works great too.

Mr. Bean

Vig wrote: »

Gray wires, on a gray/dark gray checker background = about as visible as a polar bear in a snow storm. /rimshot

Yeah, I know where you're coming from...sorry, next time I'll make it much more visible.

Vig wrote: »

The mesh could be inverted.

In face/poly mode in the UV editor go Select > Select Inverted. It will highlight whatever needs to be flipped (using the Mirror tool in the UV editor).

It only highlights the ears, so I'd be surprised if that caused the whole head to crumble, but I'll fix that anyway.

Vig wrote: »

Also try relaxing by face angles instead of edge angles. The soft select trick PoroXum mentioned works great too.

Okay, I'll use that. Could I get a little more info on this "soft selection?" I've used soft selection before, but only on the actual model, not the UVs.

Mr. Bean

So this is a different head model that I feel is better, but I'm still trying to unwrap it. I followed that pelt mapping tutorial and got the following results:



It didn't look good until I relaxed it, but I had to relax it carefully, in separate sections.

I have yet to mirror it, but I have a small question: how do you clone UVs? If you look at the screenshot, the ear on the left side is unwrapped properly, but the one on the left side isn't unwrapped yet. Instead of doing the exact same thing for the other ear, I thought that there was a way to copy a UV. I tried selecting copy under the edit menu, and then paste, but for some reason that didn't do anything. I use 3ds Max 2009.

Does this UV layout look good, and does anyone have any ideas about how to copy that UV for the ear?

Have a great weekend,
Mr. B

East

At a first glance it looks like you might have a bit too much UV space at the back and on top of the head. What does it look like when you apply a chequered texture? If the chequers are smaller at the back than the front then this might be something you want to look into.

As for the ear.. It's an extremely simple shape, so it shouldn't take too many seconds to do a planar map, make a few edge splits, and pull some of the UVs into the right place..

Mark Dygert

Mr. Bean wrote: »

Okay, I'll use that. Could I get a little more info on this "soft selection?" I've used soft selection before, but only on the actual model, not the UVs.

In the upper right of the Unwrap Options Panel.

Mr. Bean

Thanks for the response.

The checkers look pretty good; I'll post a picture later. The reason there's so much space in that area is probably because I relaxed it so much; it took a lot of relaxing to fix the checkers from being too stretched. But I will take your advice and look into it...

East wrote: »

As for the ear.. It's an extremely simple shape, so it shouldn't take too many seconds to do a planar map, make a few edge splits, and pull some of the UVs into the right place..

Well, I wasn't concerned about how much time it took. Since this is a game model I'll be mirroring one half of the UVs over the other. So if I did the other ear manually, I thought it wouldn't align properly (since they wouldn't be perfectly the same) when I place one half over the other and weld the verts.

Mr. Bean

Vig wrote: »

In the upper right of the Unwrap Options Panel.

Thanks Vig, now I see it. That could be a pretty powerful tool, so I'm looking forward to giving it a try. I'm actually surprised that I never saw that before...maybe all this head modeling is starting to affect my mind

Mr. Bean

On second thought, I'm not going to mirror the side, as the texture may be asymmetrical.

I want it to be a 512X256 map, since the UVs aren't square and leave a lot of room in the "blue square" in the UVW edit window. But when I render the UVW template, it squashes the UVs. I want the template to be the same shape as the UV layout, not the other way around.

Any ideas?

Thanks.

Mark Dygert

Stretch it to fill the square.
Then set the Use Custom Bitmap Size (under soft select in the options panel) to be the dimensions you want or change the upper right texture select drop down box to be your 512x256 texture instead of the default checker pattern.

Mr. Bean

Perfect, thanks