ascii files and curvature calculations

[Yves Verbandt]

Dear Grass experts,

I am a biomedical engineer working in the field of cardio-respiratory
physiology.  We have reconstructed 3D images of the human diaphragm in
ascii format, i.e. a list with (x,y,z) coordinates.  The data are very
irregularly spaced due to the nature of the CT scanning technique and
the existence of "holes" in the diaphragm.  I have read the Grass
Beginner's manual but did not find a vlear answer to the following
questions (I acknowledge my complete ignorance of your subject) :

1. How can I import ascii files with 3D coordinates into grass?
2. Can grass calculate the principal curvatures in any point of my
surface?

Thanking you very much for your kind help, I remain

Sincerely yours,

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Yves Verbandt
Université Libre de Bruxelles
Biomedical Physics Laboratory
cp. 613/3, Route de Lennik 808,
1070 Bruxelles, BELGIUM
tel. +-322-555.61.63
fax. +-322-555.61.62
email. yverband at ulb.ac.be
web. http://www.lpbm.ulb.ac.be
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