Re: [Gnuplot-info] maxima + gnupolot: 3D rendering bug?

[Stanislav M. <sta...@gm...>]

Hello,

On Fri, Dec 10, 2010 at 10:06:52PM +0100, Petr Mikulik wrote:
> > > I suggest that a better approach would be to add a pass that splits large
> > > triangles into smaller pieces before sorting and rendering.
> > > The only tricky part is how to define "large".
> > 
> > I was thinking about exactly the same thing, but then realized that
> > there is already the "interpolate" option that does (almost) the same.
> 
> Does "pm3d interpolate x,y" works for you?

You mean, for that dataset that I submitted together with the patch?

I just tested it with "interpolate 0,0". As expected, interpolation
smoothens the surface and produces a better figure, but it still has
very noticeable artefacts (see the attached default.png). If I add
"corners2depth c3" the result is much better (c3.png). 

> Yes, this interpolation is some kind of smoothing because you add new 
> objects.
> 
> > of 4 corners, instead, it introduces a new pm3d option "corners2depth"
> > that allows for configurability of the depth sorting in a similar manner
> > as already existing "corners2color" option adds configurability
> 
> I think this option is useful.

Yes, with the curent rendering algorithm it is for sure useful.

--
Stanislav