[Octave-bug-tracker] [bug #47974] Visual differences between gnuplot and OpenGL toolkits

[Dan Sebald]

Follow-up Comment #38, bug #47974 (project octave):

Rik, yes I think the second mesh patch is ready.  There's been some discussion
on the gnuplot list about making surface lines behave transparent, but I don't
think that is a near-term thing.  So, the best is to just stick with drawing
individual lines...  The thing that worried me a bit was that the individual
lines would mess up the "legend()" somehow, but it doesn't seem to do so. 
There is still only one child so only one legend string that can be specified.
 BTW, the legend entries for a surface (regardless of toolkit selection) are
nothing but a blank space.  Wouldn't it be worth putting maybe a facecolor
splotch next to a sample edge line in that space?

The unset view line.  OK, I see now.  pcolor wants to use the map view.  I
think there is an easy fix for that:

1) As you suggest, take gnuplot out of 3D map mode when it is set, but rather
than use "unset view", use "set view 0,0" (or whatever it is) so that when
rotating the map it doesn't make a big jump to a completely different angle.

2) Rather than "view map", just set the angle to 0, 0... i.e., do nothing. 
The ramification of that is two things: the projected 2D map view comes out
smaller and the annotation for the z axis is all lying on top of one another
creating a ball of illegible characters in the lower left corner.  Right now
I'm discussing with gnuplot developers the issue of finer 3D layout control
using margins--so although going this route makes good sense, gnuplot may be
in flux here for a while.  I think I will also raise the issue with them about
these perpendicular to viewer axis annotation lying on top of one
another...maybe that should just not be displayed of the view comes out
orthographic.

Let me redo the previous "set view" patch and attach a new version.

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