Re: improvement for surface plots

[Kai Habel]

John W. Eaton schrieb:
> On 11-Mar-2008, Kai Habel wrote:
>
> | Hello all,
> | 
> | with the current tip surface plots do not look nice. The grid is plotted
> | in front of the surface. The attached patch makes two changes, first
> | surfaces are plotted in front of the grid, thus the surface looks opaque.
> | h = surf(peaks);
> | 
> | 
> | Second, for mesh plots an uniform color value works now.
> | h = mesh(peaks);
> | set(h,'EdgeColor','r');
> | 
> | 
> | But, to make this work a very recent gnuplot is required (4.2.3)
> | otherwise the mesh is not drawn. See also this [1] discussion.
>
> I applied this patch to my archive.
>
> Now when I try to set the edgecolor, I get a white mesh.  Is that what
> you mean by not working with older versions?  I'm using 4.2.2.
>
> Thanks,
>
> jwe
>
>   
Yes, that what I mean with "otherwise the mesh is not drawn" only the
white facets are drawn. Also see this explanation from the gnuplot list.

> A bit of both. The issue is that the colors for hidden-surfaces are
> auto-generated based on the line _type_,  but you gave an splot
> command using a line _style_.   Bad luck that it somehow ends up
> choosing a
> linetype lt -2 or -3 (background color or no line).
>
> This is supposed to be fixable using the command
>         set style increment user
> (which is a truly horrible name for a command;  kudos to anyone who
> can suggest a better one so that we can deprecate this).  This command
> causes the user-defined line _styles_ to be substituted everywhere a line
> _type_ would normally be used.  
>
> So much for the script buglet.  Unfortunately, the hidden3d code in
> 4.2.2 fails to notice when you set this flag, although the CVS version
> gets it right.  The fixed code will be in 4.2.3, which should be out
> "real soon now". 
Kai