Are the difficult scenarios you mention not ultimately a non-manifold geometry
problem?
This reminds me on the "Any tips to fix non-manifold vertices in Soft?" thread
as of June 26th.
We came up with:
"A vertex is non-manifold if more than two of its adjacent edges
do not share their second vertex with any other of said adjacent edge's second
vertices."
Or as Martin Chatterjee put it slightly differently:
"I'd check if a vertex has a neighborPolygon that does *not *share an edge with
any of the
other neighborPolygons"
According to this it should be possible to identify problematic vertices and split the
capping process up on a "per island" basis.
Back several years ago I spent quite a bit of time trying to develop a
"Fill Hole" script similar to Maya's. Beware this activity when using
something automated.
I ran into immense difficulty trying to develop a method for sealing
winged holes. In general holes which are an island upon themselves are
easy to fill. That means that if a quad hole has an adjacent poly
present at each edge and more importantly each vertex, totalling 8
polys surrounding the quad hole, the hole is extremely easy to fill. I
succeeded quite well at accomplishing an automated script to fill all
holes on a mesh in one click.
The problem however is if any hole has another adjacent hole present at
a shared vertex (oxymoron? since you can't really share vertices for
something that technically is a void), but separated by two polys winged
at the vertex, its extremely difficult by conventional standards to not
identify the two holes that are winged as a single hole.
If memory serves me right even Maya had an issue with this as you could
delete a single poly on a mesh and if the sphere was selected as an
object running Fill Hole would automatically seal all valid holes.
However if their were two holes and they were adjacent, or winged at a
vertex, Maya was smart enough to know how to avoid the situation and
would prevent the winged holes from being filled with a single poly.
The point is, its fairly easy to to write a script to fill the hole, but
it must be smart enough to prevent the winged holes from becoming a
single poly, which is very very bad. If you have a script that was
written to do this task, test it on an example with winged holes before
you proceed. You won't regret the extra effort.
Incidentally this tool is not impossible to write, but as a script or
plugin it requires special information about the topology be available
for the user to query. In my experience XSI did not provide enough
vertex, facet and edge info to give the developer enough information to
easily script a bulletproof fill hole tool.
Joey Ponthieux
ATOL Experiment Specialist
LaRC Information Technology Enhanced Services (LITES)
Science Systems and Applications, Inc.
NASA Langley Research Center
15 Langley Blvd B1268 R1051
Hampton, VA, 23681
Phone: 757-864-6754
EMail: [email protected]
____________________________________________________________
Opinions stated here-in are strictly those of the author and
do not represent the opinions of NASA or any other party.
On 2/13/2012 1:12 PM, Alan Fregtman wrote:
Sweet! Thanks, Mr.Core! ;)
On 2/13/2012 11:47 AM, Oleg Bliznuk wrote:
Hi Alan,
you can also do it with a little bit modified "cap holes" compound via
ICE, we are using it in ImplosiaFX
http://clip2net.com/s/1ABrt
-Oleg
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