Re: Bug in octave/gnuplot surface code?

[Daniel J Sebald]

David Bateman wrote:
> Kai,
>
> The sphere function from JHandles is entirely independent of JHandles
> itself as as a core function should probably migrate to Octave. However,
> I tried it out and got some very strange rendering errors with the
> gnuplot x11 terminal, that I believe are an issue in gnuplot, though it
> might be sometime in your recently introduced "surface" code.. Could you
> try the attached function, just typing "sphere()" to get a default
> surface plot. In particular the rendering errors are made very obvious
> if you rotate the sphere with the mouse..
>
> If this is a bug either in Octave or gnuplot we are likely to see other
> issues with surface plots..

David,

There was an issue in gnuplot not too long ago with hidden lines with 
degenerate quadrantles.  For example, a sphere might have some segments near 
the poles that are triangular, i.e., two points of the quadrangle are the same. 
 That should have been addressed however.  Could you send a PNG screenshot to 
me of the plot?

Dan