maya: cleaning double sided polys?

rooster

we've got a couple assets which somehow have been given double sided geometry (hair, think someone didn't know about cullmode off and copied the polys, flipped normals and merged)

is there a one-step solution I can use to strip the reverse facing polies? hair with alpha planes so doing this by hand would be a pain in the diddies

I've already tried cleanup, without luck. maybe I'm missing an option somewhere?

chars,
rich

CheeseOnToast

Did you have lamina faces checked in the cleanup options? That *should* do it.

rooster

yeah..

after a bit more fiddling it looks like none of the verts are welded :S
and of course it won't let me weld them, to avoid creating lamina faces!

fook

CheeseOnToast

Here's a bit of a hacky way to do it. Select your merged hair object, copy uvs to a new set (createUVs>Copy to new UV set). In the UV window make sure you have the second set of UVs selected for the object. Now still in the uv window hit layout, with the options set to non overlapping and "flip reversed" unchecked. Now go to the "image" tab in the window, and hit "shade uvs" Now all the reversed bits should be shaded red, and you can select them easily. After deleting them, get rid of the second uv set and you should be left with the original geometry and UVs only.

willy-wilson

so its a seperate mesh but part of the same object? if so couldnt you just go into face mode and double click on one of the faces to select all the faces for that mesh and delete them?

rooster

I'll give that a shot cheese, thanks

willy: since the verts are unwelded, its like.. hundreds of seperate meshes in one object..

ivars

You should be able to merge the vertexes, and then use cleanup. That's how I usually do it. What version are you using?