From: Steven Adler \( A3DM \) (adler@a3dm.com)
Date: Fri Mar 08 2002 - 06:01:59 EET
Charles
I understand all of what you said and thank you for your reply..... for the
most part "watertight" was merely a desire not to have to fix Stl files (
couldn't hurt to ask for the sun moon and stars ). Sometimes the effort is
worthwhile, and with tools like MagicsRP I can do a pretty good job. As to
the co-planer surfaces , I am just careful to make sure that the scale is
sufficiently large to fully develop the smallest Z axis feature. My system
will step down to 0.0005 inches and my build table is 12x18x12 so I have
significant flexibility. As for thin walls, I usually don't go thinner than
0.010 so, I use MagicsRP to view the file in cross and look for thin walls,
and find again the smallest feature......
Fortunately, I don't need to make these buildings to anyone's specifications
in terms of size......
again thanks for your input and keep me informed
Steven Adler CEO
Automated 3D Modeling
adler@a3dm.com
www.a3dm.com
----- Original Message -----
From: "Charles Overy" <cwho@lgmmodel.com>
To: <rp-ml@rapid.lpt.fi>
Sent: Thursday, March 07, 2002 7:09 PM
Subject: Re(2): 3D-City
> 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
>
> adler@a3dm.com
>
> 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
>
> > >
>
> > > dbourell@mail.utexas.edu
>
> > >
>
> > > ****************************************
>
> > >
>
> > >> 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
>
> > >> robert.wright@jhuapl.edu
>
> > >>
>
> > >>
>
> > >> 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/
>
For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
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