[Octave-bug-tracker] [bug #51938] Contour lines of meshc disapear when calling axis

[Dan Sebald]

Follow-up Comment #3, bug #51938 (project octave):

Acknowledging the behavior here, and noting that this is "Any" operating
system.  Also, the contours disappear in the gnuplot toolkit as well, so that
means contour lines are not being handled by gnuplot (since gnuplot handles
contours without forcing some z coordinate on the lines...they always are
associated with the border) and that its not a real low level function of
gl-rendering where the problem lies.

Sort of mid-level routine would be my guess.  But I'm also wondering if there
is a design problem in the sense that only the lowest level of plotting can
determine what the eventual axis limits will be.  Or maybe the contour drawing
needs to be done with one of those feedback functions such that when the user
rescales the plot or moves the axes about via the mouse wheel then the
Z-position of the contours is changed.  The equivalent concept for gnuplot
would be using gnuplot's internal contour commands, because gnuplot is the
only code that knows what the final plot limits are.

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