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Surface normals with shade_volume [message #10894]

Mon, 09 February 1998 00:00

olaf
Messages: 2
Registered: February 1998

Junior Member

Hi,

I would like to write an IDL export tool for the STL-file format
(stereolithography format for rapid prototyping).
Therefor I need the surface normals of polygons coming from the
shade_volume IDL-routine. I need them for distinguish inner from outer
contours in the dataset.
So far as I know IDL is using the Marching Cubes algorithm for
building isosurfaces, so in principle it should be possible to get
the surface normals.

Do you have any idea how to get the normals ??

Cheers,
Olaf

------------------------------------------------------------ ----------

Dr. Olaf Guennewig
Qualitaetszentrum Dortmund
olaf@alpha1.physik.uni-dortmund.de

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