Re: Bug in octave/gnuplot surface code?

[kahacjde]

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..

D.


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David,

without trying it, I suspect you mean the hidden line/surface removal in
pm3d mode. As I understand from Petr Mikulik's mails this is 'feature' of
gnuplot. It can be somewhat controlled by the "scansautomatic | scansforward
| scansbackward | depthorder" parameter of pm3d [1]. I have noticed this for
the ribbon function too, but have not found a solution. It is one of the
reasons why should switch from gnuplot to an toolkit with OpenGL support
(especially for the 3D functions).

Kai



[1] http://gnuplot.sourceforge.net/docs/node214.html#set_pm3d 
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