Newbie : Poly->SubD

[sa9dm]

Ok.. kind of replying myself here..

But plz have a look at the attached pic. When I select all the edges, and do an extrude edge and thereafter try to do the conversion, it fails as I told above. (Tried with both keep the faces together, and without)

However, if I select the face and use Extrude Face, and therafter do the conversion, after deleting appropriate faces, the conversion is succeful.

Any ideas, why this happens? Any theory links also wud be great.

sA

[robin]

I dont really understand your question.

I did this tute a while back and it worked perfectly well.

[sa9dm]

hm...

Just want to know what precautions should one take, while building a polygon geometry, if one has to convert it to subD afterwards?

Or in other words, how can we be sure that the geometry which we are creating is always proper and manifold?

sA

[wellsae]

I'm no expert on this, but I recently did a character in polys to be converted into Subdivision. I think one of the important general guidelines is to keep every poly as a quad, so you want to be very careful with the split polygon tool or you'll create whacky polygons.

[bennyboy2]

As far as I know, the conversion works for only contiguous surfaces. Quads will definitely give the best-looking subdiv surface, but that's not your problem.

The following will convert fine (I just made a plane):
http://lazmin.com/subdiv/OK.gif

But the following won't:
http://lazmin.com/subdiv/NOGOOD.gif

In the second pic, three faces are connected to 1 edge. Can't do that! :)

I hate when this happens, because often it's just a little thing stuck in a corner you can't see. But you probably have an edge somewhere with 3 or four different faces coming from it.

--EDIT--
I just looked at your pic. You just used create poly tool to trace around the face, right? I think it would be pretty hard to make non-manifold geometry using this method... good job! lol

Really, though, I guess you might have clicked on the same place 2 times, giving you 1 very tiny little edge that you can't even see. Since you just started, I'd just trace the face again. Should work fine text time-- think you just had bad luck. :)

[bennyboy2]

PS Maya has a help file. If you had done HELP->CONTENTS and SEARCH, you would see that entry number 2 has the information you need.

It explains my example and 2 other ways you could potentially screw up the geometry.

@sa9dm: read this help file and just avoid the things it mentions... they're pretty well explained.

[sa9dm]

OK.. Bennyboy2 and Wellsae, that helps a lot. Thanx!


I m a bit sorry.. that i didn't go through the Help first. Will take care of that in the future.

[robin]

Oh OK

you didnt read the Docs, thats fine we at cgtalk will read those for you.

have a nice day
:cool:

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