From: Charles Overy (cwho@lgmmodel.com)
Date: Fri Mar 08 2002 - 02:09:12 EET
Steve,>>If anyone has or knows of a "watertight" stl file of an interesting building with lots of detail... whooooo, you said a mouthful. I know people on the list might be expecting me to jump in here so I will!. The fundamental problem is that a building, in the real world, is not watertight. Therefore, the greater the detail and fidelity with which you draw the building, the less of a single watertight solid you will have. That is not to say that a good architectural solids drawing shoud have open planes, flipped triangles or other errors but it will, in theory, consist of litteraly thousands of non unioned solids. Many of these solids will have very nearly coplanar faces at the scale the model will be printed. In reality, almost all CAD or preprocessing programs that I have found are not set up to handle this type of data. In addtion, you have the "thin wall problem". While more complex, again the short version is that you cannot just scale a 8" thick wall down!
by 1/200 and run it on your RP machine. There are numerous other issues associated with architectural workflow. So right now, there are very few ""watertight" stl file (s) of an interesting building with lots of detail". The few that are out that I have seen are either drawn in solids as a mass sketch, in which case, they rarely have a lot of detail, or they have been redrawn for RP, which is what we do. That having been said, we are actively working on a software solution to Rapid Protoyping in architecture, and I have made significant progress in the past 6 months. We hope to announce a robust soulution this year but if anyone is interested, please contact me off list. I would be interested to know what sort of market support there would be for this product. We are also looking for a structure for this solution and my first choice is to do it as a plug in to an existing CAD program or STL preprocessor. ThanksCharles OveryLGM-----Original Message-----From: Steven !
Adler \( A3DM \) <adler@a3dm.com>To: lonepeak <lonepeak@aros.net>;rp-ml@rapid.lpt.fi <rp-ml@rapid.lpt.fi>;Dave Bourell <dbourell@mail.utexas.edu>Sent: 3/7/02 3:31 PMSubject: Re: 3D-CityI have been building very small architectural structures for demonstration
use at trade shows. If anyone has or knows of a "watertight" stl file of an
interesting building with lots of detail.... let me know.....Everyone wants
to see things bigger or smaller than reality........ interesting.....
Steven Adler CEO
Automated 3D Modeling
www.a3dm.com
----- Original Message -----
From: "lonepeak" <lonepeak@aros.net>
To: "Dave Bourell" <dbourell@mail.utexas.edu>; <rp-ml@rapid.lpt.fi>
Sent: Thursday, March 07, 2002 3:52 PM
Subject: Re: 3D-City
> Thanks for putting this in for us. Two statues were built for the
Maitreya
> Project in our facility using Dr. Thomas' system. Both Buddha statues
were
> 20 feet tall. The first statue was a mixture of 1/2" and 1/4" inch
layers.
> The second statue was all 1/4" sheet material and we built it start to
> finish in 25 days using 3 people. Both statues were sealed with a
urethane
> coating.
>
> One statue is located in California at the International Buddhist center
and
> was on display when the Dali Lama visited there last Spring. The other
> statue was shipped to India.
>
> We have also used to system to build a 12 foot tall sculpture for another
> client.
>
> I know that Dr. Thomas has used the system for some other projects since
> then. The file format for this system is STL.
>
> Alair
> Javelin 3D
> www.javelin3d.com
>
> > From: Dave Bourell <dbourell@mail.utexas.edu>
> > Date: Thu, 7 Mar 2002 09:09:06 -0600
> > To: rp-ml@rapid.lpt.fi
> > Subject: Re: 3D-City
> >
> > Hi-
> >
> > Alair Griffin (Javelin) and Charles Thomas (University of Utah) had a
> > process for producing large parts (cf., SFF Symposium Proceedings,
> > 1999, pp. 751-758). They built a 20-ft tall statue using 1/2" thick
> > polystyrene foam sheets. I think the actual construction was done at
> > U of Utah.
> >
> > Dr. Dave Bourell
> > Temple Foundation Professor
> > University of Texas at Austin
> > Mechanical Engineering
> > MC C2200
> > Austin, Texas 78712-1063
> > USA
> >
> > +512-471-3170 voice
> > +512-471-7681 fax
> >
> >
> > ****************************************
> >
> >> Delivered-To: dbourell@mail.utexas.edu
> >> From: "Wright, Robert A." <Robert.Wright@jhuapl.edu>
> >> To: "'rp-ml@rapid.lpt.fi'" <rp-ml@rapid.lpt.fi>
> >> Subject: 3D-City
> >> Date: Thu, 7 Mar 2002 09:22:39 -0500
> >> Sender: owner-rp-ml@rapid.lpt.fi
> >>
> >> Hi List,
> >>
> >> I've been asked to inquire about building large-scale models. Does
anyone
> >> have any suggestions on what type of rapid prototyping process could be
used
> >> to build an accurate 3-D City? The finished product will be 12' X 12'
and
> >> the tallest building will be 18" tall.
> >>
> >>
> >> Robert Wright
> >> Senior Mechanical Fabrication Technician
> >> 240-228-7772
> >>
> >>
> >> For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
> >
> >
> >
> > For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
> >
>
>
> For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
>
For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
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