Lieber Albert,
3D-Daten, die nicht in einem Gitter angeordnet sind, lassen sich mit
der Delaunay-Triangulation in Dreiecke zerlegen und dann zeichnen.
Eine Routine dafür hat Tom Wickham-Jones für sein Buch
«Mathematica Graphics: Techniques and Applications» entwickelt.
Damit kann man offenbar auch Konturen zeichnen (ohne Gewähr).
Seine Programme sind auch auf MathSource erhältlich, in
<http://www.wolfram.com/cgi-bin/MathSource/Enhancements/Graphics/3D/0205-041>.
Anbei die Beschreibung.
Roman Mäder
Title: MathSource Browser
ExtendGraphics Packages by Tom Wickham-Jones
Tom Wickham-Jones
These files form a set of extended graphics functionality and
are used and described in the book "Mathematica Graphics:
Techniques and Applications" by Tom Wickham-Jones, published
by TELOS/Springer-Verlag 1994 ISBN 0-387-94047-2. They
provide functions that include the plotting of surfaces and
contours over random data sets, labelling of contour lines,
plotting contours subject to a constraint, smoothing
contours, plotting field lines, a collection of geometric
functions in two and three dimensions, as well as the
ubiquitous fractal plot. Some of the functions require
MathLink binaries which are available in source code and are
compiled for Macintosh and Windows computers.
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