[Octave-bug-tracker] [bug #35761] surf() fails when Z values are within eps of each other

[Rik]

Follow-up Comment #4, bug #35761 (project octave):

I think the fix lies somewhere else.

This sample code works in the current version of Octave, but produces a
monotone green image with your patch applied.


graphics_toolkit fltk;
[X,Y,Z] = peaks ();
Z * = 1e-30;
surf (X,Y,Z);


The issue is that sometimes the difference between min_val and max_val can be
less than sqrt (DBL_EPSILON) but this doesn't mean there is any problem.  The
color values are scaled so [-1, 0, 1] are just as good as [-1e-30, 0, 1e30].


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