| Re: Surface normals with shade_volume [message #10890] |
Tue, 10 February 1998 00:00 |
bowman
Messages: 121
Registered: September 1991
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Senior Member |
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In article <6bnvjk$c1a@nx2.HRZ.Uni-Dortmund.DE>,
olaf@alpha1.physik.uni-dortmund.de (Olaf Guennewig) wrote:
> Hi,
>
> 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 ??
The IDLgrPolygon object in the v5.0 Object Graphics system will return
normals. I'm about to try to use the Tessalator object to convert the
polygons to triangles.
Good luck, Ken Bowman
--
Kenneth P. Bowman, Assoc. Prof. 409-862-4060
Department of Meteorology 409-862-4132 fax
Texas A&M University bowman@csrp.tamu.edu
College Station, TX 77843-3150
Satellite ozone movies on CD-ROM --> http://www.lenticular.com/
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