[Octave-bug-tracker] [bug #41277] isosurface plotting performance poor on random data

[Rik]

Follow-up Comment #2, bug #41277 (project octave):

This is back to the poor performance of the patch function when called with
lots of patches.  There is a similar bug open about the poor performance of
the scatter function (bug #40663).  The problem is not Octave's m-file
implementation of isosurface.  You can check that by changing the final
command to be 


tic; isosurface (x, y, z, v, 0.8); toc


On my machine the m-file takes just 1.15 seconds, but the actual rendering by
OpenGL and the C++ code in Octave's drawnow routine take 17.5 seconds.

I think at some point the drawnow routine needs to be run under a profiler to
find out what the bottleneck is.


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