scheff++at++iff.fhg.de
Wed, 3 Sep 1997 14:37:09 +0200
> > we try to manipulate single polygons. I mean polygons modeled in MultiGen.
> > ...
> By "planes" I assume you mean "faces" or "polygons" ...
>
> The OpenFlight loader optimizes sibling polygons into as few geosets and
(long)
> t-strips as possible. It relies on pfdGeoBuilder and pfdTMesher to do the
> tesselating and meshing. There is no geobuilder mode to disable initial
> tesselation. You can disable retesselation by the mesher though (see the man
> page).
>
> > Is there some possibility to retrieve original MultiGen polygons in
Performer?
>
> If you isolate your polygons hierarchically using groups and objects, you can
> restrict tesselation and meshing to as few, sibling polygons as you like.
This is what I was afraid. To use an object for each polygon seems performance
consuming. So I'm thinking about another idea: To get an original polygon I
collect all triangles or quadliterals which have more than one common vertex
with interesting triangle and(!) the same orientation. (Perhaps I could compare
the normals of each triangle in one pfGeoSet to find triangles with same
orientation.)
Another possibility could be to install a loader callback function and to store
original hierarchy in an additional tree.
Are there comments or other ideas?
All help is appreciated.
Best regards,
Dirk.
--
----------------------------------------------------
Dipl.-Inf. Dirk Scheffter
Fraunhofer IFF fon: +49-39203/81591
Steinfeldstr. 3 fax: +49-39203/81619
D-39179 Barleben e-mail: scheff++at++iff.fhg.de
Germany http://wwwue.iff.fhg.de/~scheff/
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