basic implementation for isosurface, isocolors, isonormals

[Thomas Treichl]

David Bateman schrieb:
> Martin Helm wrote:
>> First of all,
>>
>> thank you for your effort David. I can confirm the errors reported by 
>> Thomas. To be precise they happen with the first two examples in the 
>> "subplot" example group which use the syntax
>> patch ("Faces", f, "Vertices", v, "EdgeColor", whatever)
>>
>> The other two examples which use "FaceVertexCData" and facecoloring 
>> work well.
>>
>> If I simply add the "FaceColor" attribute with some value to the 
>> failing patch command, the problem disappears, so the bug seems to be 
>> trivial (a misssing default value for "FaceColor")
>>
>> e.g.
>>
>> patch ("Faces", f, "Vertices", v, "FaceColor", "blue","EdgeColor", 
>> "none")
>>
>> works well. I'll look through the code.
>>
>> - mh
>>   
> The old 3.0.x behavior was that the default facecolor was [0,1,0]. I 
> presume that is the compatible behavior and so re-established that as 
> the default with the attached patch. The demo in the help string then 
> works correctly for the gnuplot CVS. But there appear to be some issue 
> with colormap with gnuplot 4.2.4 and the x11 terminal in a multiplot 
> environment.. I suppose I should try 4.2.5 and see if that works
> 
> D.

Hi David, Martin,

thanks again for this work. I'd say that this is really a very cool new feature 
that then comes with 3.2...

Some time ago I also was working on the help text of isonormals.m and 
__marching_cubes__.m (Martin already knows because I wrote him an email some 
time ago offside the lists to preserve double-work ;) David, can you please 
apply the attached changeset?

Thanks and best regards,

   Thomas
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