CGTalk - attaching Subdivs

sagmam

09-13-2003, 04:54 PM

Hi, I'm trying to attach two subdivs together, and I get odd results. It happens only when I duplicate the first surface using scale X=(-1). Example:

Make half a face, duplicate it using Scale X(or Y or Z - doesn't matter) = (-1), and do Subdivs->Attach. You will see that, if the threshold is big enough, the FARTHEST vertices are trying to connect to each other - not the closest ones...

You can easily reproduce this problem by creating a poly cube (converted to subdivs), removing its left half, duplicating it as above, and trying to attach both parts back together. If, instead of scaling to -1, you rotate it 180 degs, there is no problem. But I can't do this with a non-symmetric surface (like a face).

I've read some of the ways to attach subdivs in Maya (manual/subdiv->attach), that appeared here in the forum, but I couldn't imlement them with my half-face...

Any ideas how to make the attachment work after scaling to -1?

Bri_Spencer

09-13-2003, 05:37 PM

try converting your subd mesh into a poly mesh by going into modify>convert>subd to poly>vertice lvl 0. this will make a low poly mesh that you can easily convery back into a subd mesh. After you have your poly mesh duplicate it and attach the polys as normal then convert back to subd. Thats the way I ALWAYS attach subds. I hope it helps. :thumbsup:

ntmonkey

09-13-2003, 05:41 PM

Have you tried deleting the history of the duplicated half? I don't ever recall having any problems connecting sub-d surfaces since they're a derivative of polys in Maya. Just take your poly face cage, then duplicate that and scale negative. Combine the the two faces Polygons -> Combine. Merge the verts down the center of the head. And then Modify -> Convert -> Poly to Sub-d.

I'm still trying to create the bug that you're getting, and I'm not getting it.

:shrug:

We'll, see if we can't figure this out.

peace,

Lu

sagmam

09-14-2003, 08:10 PM

What you're saying is that you never used subdiv->attach.... why is that? Why are you using the merge-vtx method instead of subdiv->attach?

Anyway, I've tried deleting the history, and it didn't help. I'm using Maya 5.0 btw.

I have a question about what you said - converting the subdiv back to polies: I've done the test with the box, but before I converted to poly, I added some detail (refined some areas, streched a few vertices, etc). After I converted to poly, I got the corresponding mesh, but then, after I converted BACK to subdivs, I got a whole lot more faces than I originally had... Is this regular behavior?

CGTalk Moderation

01-16-2006, 03:00 AM

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.