RE: STL file control

From: Ping Fu (
Date: Sat Jul 24 1999 - 17:55:00 EEST

I believe that Polywork from Innovmetrics has some polygon optimization
tool, not sure about given constrains, but maybe you can achieve the results
you want.

Another tool you can try is geomagic Decimator from Raindrop Geomagic
Again, you can not specify constrains, but it does do a good job in
the surface with large triangels and even angles. The accuracy is in general
better than the chord height tolerance scheme. STL file is OK.


> -----Original Message-----
> From: []On Behalf
> Of Joe Paxton
> Sent: Friday, July 23, 1999 2:13 PM
> To: Rp-Ml (E-mail)
> Subject: STL file control
> What tools/resources are available that allow someone to control
> characteristics of the triangles in STL files? In addition to the chord
> height tolerance, I would like to set limits (or constraints) on
> the shape
> and size of the triangles. An example might be that no angle of any
> triangle can be less than 40 degrees, or all triangles be the same shape
> and still meet the chord height tolerance. I know this depends on the
> geometry of the model, but that's the type of thing I'm looking for.
> I have a large curved surface (14x16 feet) that I would like to
> approximate
> with large, "clean" triangles that I can cut from plates and piece
> together. I'm looking at chord height tolerances on the order of 0.l
> inches or more. The file is currently in Pro/Engineer, but I can export
> IGES, STEP, etc.
> Thanks in advance.
> ______________________________________
> Joseph Paxton
> Senior Research Associate
> Center for Automation and Robotics
> University of Alabama in Huntsville
> Research Institute, Room A-11
> Huntsville, AL 35899
> Phone: (256) 890-6243 x208
> Fax: (256) 890-6970
> Email:
> ______________________________________
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