Stewart is attending the current Telesculpture conference at PRISM
(http://prism.asu.edu/prism/telesculpt) in Tempe this week. There are many
things going around and I encourage people to log in and check out including
streaming video of panel discussion tomorrow.
Now to answer the question. Non manifolds in general are a problem
geometrically since Euler-Poincarre told us so (just kidding). But Klein
bottle can be made - with a little cheating. Unless you give more
description of the surface i cant help you. May be you can tell me the
surface you are trying to generate or send me a snap shot with the problem
area highlighted and then we go from there. The problem is the slicing
algorithms usually get confused in keeping inside outside tracking if
normals flip.
AR
---------------------------------
Dr. Anshuman Razdan
Technical Director PRISM
Email: razdan@asu.edu
http://prism.asu.edu/~razdan
MC 5106 Arizona State University
Tempe AZ 85287-5106
Phone: (480) 965 5368
Fax: (480) 965 2910
-----Original Message-----
From: owner-rp-ml@ltk.hut.fi [mailto:owner-rp-ml@ltk.hut.fi]On Behalf Of
Marshall Burns
Sent: Thursday, October 07, 1999 8:57 PM
To: rp-ml@bart.lpt.fi; Jonathan Chertok
Subject: Re: Geometric Form
Jonathan,
I think Stewart Dickson probably knows the answer to your question.
He's fabbed a lot of topological surfaces using Mathematica and other
software to generate data that he converts to StL with his own code. I'm not
sure if he's reading this list. Check out one his many Web pages at
http://emsh.calarts.edu/~mathart/R_Proto_ref.html. The contact data for him
there may not be current, so also take a look at his portfolio linked at the
bottom that page.
Good luck in your research. It sounds really interesting and I'd
love to see the results.
Best regards,
Marshall Burns
Marshall@Ennex.com
Ennex Corporation, Los Angeles, USA, (310) 824-8700
www.Ennex.com
-----Original Message-----
From: Jonathan Chertok <j.chertok@mail.utexas.edu>
To: rp-ml@bart.lpt.fi <rp-ml@bart.lpt.fi>
Date: Thursday, October 07, 1999 18:18 PM
Subject: Geometric Form
I'm looking to prototype a geometric form from a mathematical model
collection. And may be needing some help.
Trouble is this:
The surface was formed by rotating a shape about another shape. As I
understand it the "right" side of the surface runs through the "left" side
of the surface and it is possible the Normals don't correspond appropriately
in order for the computer to render the form. i.e. the right normal says
"on" and the left Normal says "on" when it should say "off". Think fat
Moebius loop that intersects itself as it "rounds the corner".
I've seen this form generated in plaster, so it obviously can be
made. The program that generated the graphic was FORM Z.
The question is this:
Is there a way to "fill" or "normalize" this surface in order that
the STL or IGES will read appropriately for the machine to render the form?
In that I am not concerned with the internal geometry of the form - just the
shape outside - I can't help but think there must be a convenient way to
convert this file.
Thanks in Advance to the Kindness of Strangers
Jonathan Chertok
j.chertok @mail.utexas.edu
***
UNIVERSAL JOINT DESIGN
"for the most useful things since the incline plane and the lever"
***
COMING ATTRACTIONS:
There will be a travelling exhibition of these forms that I will be
getting together as a follow-up to my Graduate Architecture thesis. Anyone
that wishes to is welcome to contact me, as I imagine I'll be needing some
help and funding contacts (especially appreciate hearing from some heavy
hitters). The project ROCKS (Real Serious and Real Cool).
[Note: DO NOT confuse these forms with the stuff you've seen before.
Consider these more like a Twentieth Century version of Euclid's solids.]
I think with some more specific information a lot of industy cats
looking for great PR will be quite interested (Get on board you won't be
disappointed). Starting small here with a firm in Austin, Texas - but look
forward to hearing from the larger RP community interested in pure research
and amazing sculprural form.
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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