Re: new demo with cyan lines

[<br...@ph...>]

Ethan Merritt wrote:

> I will construct a full example pair if you like, but my observation
> is that in case such as the final plot in rgb_variable.dem, the axes
> are properly occluded by other plot elements if you draw them by
> including a dataset of  unit vectors in 3D, but not properly occluded
> if you draw them via the "set zeroaxis" command.

I don't think that would make a difference.  The problem is simpler: 
hidden3d doesn't try to hide points behind lines.  For actual points, 
that wouldn't be a problem: the probability of in infinitely small point 
actually coinciding with a zero-width line is zero.  The problem is that 
point symbols aren't zero-size, and lines aren't zero-width.  To fix 
that would take almost a rewrite of hidden3d.  I'm not sure we want to 
go there.

There's more wrong with those plot than just the hiding of the zeroaxis 
itself.  E.g. the direction of the tics on the "Green" (y) axis the 
wrong way round --- the tick labels are inside the plot, the ytics point 
outward, rather the opposite of what the sate of 'set ytics in' would 
suggest.

And the "Warning: Single isoline..." message from the pm3d code is 
getting rather in the way of rotating that plot via mouse.  That warning 
needs to be limited to at most a few displays per gnuplot session.