[scilab-Users] Plotting 3D data

[Kajetan Berlinger]

2009/8/17 Manuel JULIACHS <manuel.juliachs at scilab.org>:
> Kajetan Berlinger a écrit :
>>
>> Hi *,
>>
>> very simple questions from me as a newbie to Scilab ...
>>
>> (1) I just want to do a simple 3d plot of points randomly distributed in
>> space.
>> How can I do that?
>>
>> (2) How can I get a plot that tries to fit a surface to these points?
>>
>> Thanks!
>> kaj
>>
>>
>
> Hello,
>
> supposing your point coordinates are stored into 3 same-sized lists
> x, y, and z, you have to execute the plot3d(x,y,z) command, retrieve
> the drawed surface and modify its properties in order to display points
> instead of facets:
>
>
> plot3d(x,y,z);
> s=gce();    // retrieves the surface object
>
> s.surface_mode="off";
> s.mark_mode="on";
> s.mark_style=1;    // sets mark style to cross
>
>
> Type:
>
>
> help surface_properties;
>
>
> for more information.
>
>
> Concerning your second point, I'm not sure of how you can
> fit a surface to a set of randomly distributed points.
>
> The simplest thing to do would be to render facets using your points
> as facet vertices, which is plot3d's default operation.
>
> However, this requires you to know how points are connected to one
> another, to be able to correctly specify facet vertices.
>
> Best regards,
>
>
> Manuel Juliachs
>

Thanks, Manuel! That helped a lot!
kaj