| Re: Vertices and Polygons [message #20556] |
Thu, 06 July 2000 00:00 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Larry Busse <ljb@ljbdev.com> writes:
> I have an N-element list of vertices v(3,N) which describe a series of
> points on a surface of a complex object.
>
> Is there an IDL function or method which would sort through this list
> and generate the polygon array that is required by POLYSHADE for doing
> surface rendering?
>
> It's been awhile since I've used IDL so maybe there's a newer object
> oriented approach that you could recommend.
I don't think that a simple list of vertices is enough information to
reconstruct a complex polyhedron, especially if there are some
concavities. [ If you want the complex hull, that's a different
story, but as Chris J. reports, this may not even work right. Doh! ]
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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| Re: Vertices and Polygons [message #20557 is a reply to message #20556] |
Thu, 06 July 2000 00:00  |
Chris J.
Messages: 1
Registered: July 2000
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Junior Member |
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I use MESH_OBJ to do this in direct graphics. Sorry, but I'm
unfamiliar with object graphics so can't give you any help there.
Unfortunately, mesh_obj doesn't always give me the surface I
want, it probably has something to do with the order the
vertices are given. I'm trying to display a convex hull, and
although I know the resulting vertices are correct, the 3D
surface usually has some concavities. So, incidentally, if
anyone knows a way around this, I'd love to hear!
Chris
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