> > p1(x,y,z), p2(x,y,z), p3(x,y,z), and for all x,y,z p1^2+p2^2+p3^2=1. > > I want to find points, where p3=-1. > > Now, that cannot be done with IsoSurface, > > since (in principle) there are no points in the lattice, where p3=-1 and > > IsoSurface (quite understandably) does not do extrapolation. > But it does interpolation. I am a bit tired so I may be saying something, > but I don't understand why it doesn't work.
p3=-1 is the *extremal* value of p3 (line one in my double quote), hence it
cannot be found by interpolation.
But never mind: mlab.pipeline.tube seems to be doing more or less what I want.
It strangely leaves small gaps between the line segments, though, but I
suspect that is a rendering or rounding error. I will look at it more closely
later.
Cheers,
Juha
--
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| Juha Jäykkä, [email protected] |
| http://www.maths.leeds.ac.uk/~juhaj |
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