[SciPy-user] Questions about Line Integral Convolution tutorial
Bridgman, William T.
Mon Nov 24 10:46:00 CST 2008
I found the Line Integral Convolution (LIC) example very timely for a
project I'm working on.
Once Cython & Pyrex were installed, the demo ran out of the box.
However, now I'm trying to apply this to a different dataset and the C
component is crashing with index errors. I suspect these are being
caused by the fact that my dataset is not a square array.
An examination in the .pyx file has a couple of locations where the
array indices appear to be transposed between x,y vs i,j. I'm not
sure if this is a bug or not. The high symmetry of the demo vector
field would probably not reveal this if it were a bug.
So my questions for the author of the code or the list are:
1) Is there a paper or other reference for the algorithm implemented
here? My searches have revealed several types of LIC
implementations. It would be nice if this were in code comments or at
least on the tutorial page.
2) Is the algorithm, the demo code, or LIC in general, restricted to
3) Is there a pure-python or numpy-only (no Cython or Pyrex
Dr. William T."Tom" Bridgman Scientific Visualization
Global Science & Technology, Inc. NASA/Goddard Space Flight
Email: William.T.Bridgman@nasa.gov Code 610.3
Phone: 301-286-1346 Greenbelt, MD 20771
FAX: 301-286-1634 http://svs.gsfc.nasa.gov/
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