Date: Tue Aug 12 2003 - 06:50:21 EEST
If you are having the file built on a LOM system, make sure it is built
upside down (i.e. with mountains forming a "V"-shape).
This should still give you the subtle contour lines / increased communication
effect that Brock referred to, without any overburn that can occur if the
laser is tracking loads of data points in a small area (the LOM plotter control
software does carry out a form of dwell compensation but it can be quite crude
when dealing with converted GIS files).
I was involved with the building of a scale model of a section of the Severn
Valley in the UK a few years ago, and the GIS data which was converted from
Ordnance Survey information was very detailed. (Made for v.large STL file as I
In a message dated 11/08/2003 21:02:27 GMT Standard Time,
> Subj:Re: 3D Topographical File
> Date:11/08/2003 21:02:27 GMT Standard Time
> From:<A HREF="mailto:firstname.lastname@example.org">email@example.com</A>
> To:<A HREF="mailto:firstname.lastname@example.org">email@example.com</A>
> CC:<A HREF="mailto:firstname.lastname@example.org">email@example.com</A>, <A HREF="mailto:firstname.lastname@example.org">email@example.com</A>
> Sent from the Internet
> Many people may remember the topographical models Helisys used to build.
> The burned edges of the paper between each build layer gave the models a wood
> grain effect that was not only beautiful, but also increased the sense of the
> contour of the land, as 2-D topo maps do. I don't know if such layered models
> were more or less accurate, but leaving
> the visible lines in the model, combined with the physical shape, to me at
> least, increased the communication value. Rather then sanding down the steps
> between layers (to gain accuracy), you might consider leaving the lines in,
> even in a metal model, for aesthetic value.
> Brock Hinzmann
> Makai Smith wrote:
> > It's not _that odd.
> > There's always the USGS DEM. They're 1/4 mi. squares, raster heights at
> 30m spacing. The Z tends to be more accurate, mostly derived from 1:24k topo
> quads. There are a few freeware ways to get from DEM to geometry. Start at
> http://data.geocomm.com/. What's the output size? How much of the Rockies
> do they want? How important is accuracy?
> > Makai
> > -----Original Message-----
> > From: firstname.lastname@example.org [mailto:email@example.com]On
> > Behalf Of David K. Leigh
> > Sent: Monday, August 11, 2003 11:32 AM
> > To: firstname.lastname@example.org
> > Subject: 3D Topographical File
> > I have an odd request from a customer. They are wanting a 3D file of the
> > Rocky Mountains so that they can make a replica in RP and have it metal
> > plated.
> > So, any such things out there?
> > ********************************************************************
> > David K. Leigh (254) 933-1000
> > Harvest Technologies, Inc. fax (254) 298-0125
> > Rapid Prototyping Services www.harvest-tech.com
Fenland RP Ltd
Mobile: +44 (0) 7881 92 00 38
Tel: +44 (0) 1406 350 124
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