PDA

View Full Version : Fur mapping problem -- UV map has weird bald spots in it

AaronHaynes
04-13-2008, 04:58 AM
I'm having trouble figuring out why my model won't apply fur uniformly -- I've created individual UV shells for different sections of the model and am arranging them within the UV bounding box, but there are these weird patches where the fur doesn't apply in my renders.

These aren't the typical problems that happen due to a bad UV map, but uniformly empty sections that change based on where the UV sets are moved. By moving the two arm shells I made around in the UV editor, I can see that these bald patches are showing up in different places, but I have no way of knowing what's causing them, how I can see where they're located, or how I can get rid of them.

Images (click for larger versions):

http://www.3dmmfiles.com/uploads/homyguyz/permalinks/fur1sm.jpg (http://www.3dmmfiles.com/uploads/homyguyz/permalinks/fur1.jpg)

http://www.3dmmfiles.com/uploads/homyguyz/permalinks/fur2sm.jpg (http://www.3dmmfiles.com/uploads/homyguyz/permalinks/fur2.jpg)

http://www.3dmmfiles.com/uploads/homyguyz/permalinks/fur3sm.jpg (http://www.3dmmfiles.com/uploads/homyguyz/permalinks/fur3.jpg)

Anyone have any ideas what might cause this? Thanks in advance.
optimus008
04-14-2008, 03:42 AM
Hmm look like it could be an issue with the furs attribute and how it sees the faces of the geometry.

Try this select the geometry the fur is attacted to and go to Fur > Paint fur Attributes option box. The paint scripts Tool and a Paint Fur attribute box should pop-up. On the
Paint Scripts Tool ,go down to Display menu > and select > color Feed back so you can see what your painting.

Then in the Paint Fur AttributeTool > Fur Attribute >select Polar and see if you can change the direction the faces are displaying the fur. Also try Inclination and direction, to change the furs position. This usually fix's the issue for me but sometimes I just have to start over.

You might have to lay out your UV's again and apply a clean Fur description.

Hope some of this was usefull.
AaronHaynes
04-14-2008, 05:21 AM
Thanks, I appreciate the help. It seems like there was a deeper issue at work, but I have no idea what was causing it -- yet, when I arranged and normalized the UV shells after about an hour of trying everything, it started mapping them correctly.

I tried the Paint Fur Attributes Tool, but it wouldn't paint on any of the faces directly, rather it seemed to flood them when I found the specific UV that it did seem to affect. I gather there was just something weird going on with the UV map that got fixed after I normalized one or all of the shells.

The point about the Polar displaying fur in the wrong direction might explain some of the empty patches I'm getting even with the UVs working correctly, though, I'll go in and give that a try, thanks :)
AlphaJoe
10-20-2008, 06:04 PM
I know this thread is mighty old, but for anyone else who may be having this problem, if you are modifying your UV's while a fur description is attached to the mesh, make sure and delete your history. Fur does not like UV tweak history.
CGTalk Moderation
10-20-2008, 06:04 PM
This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.