I looked into this a while ago wrt 2D quad meshes, and it didn't look 
like there was anything built-in to do something like that.  All the 
gradients are 1-dimensional (i.e. between two colors, or a 1-dimensional 
lookup table of colors).  There's nothing to do a 4-way blend like 
this.  So it would have to be from scratch, at least for the colored 
part -- we can still use Agg to render the quad shapes themselves.

Mike

John Hunter wrote:
> On Thu, Aug 6, 2009 at 11:51 AM, Ryan Wagner<rwag...@vni.com> wrote:
>   
>> Hi,
>>   I'd like to propose adding a SHADES keyword to the mplot3D routines where 
>> you can supply your own
>>     
>
> The other thing that would be really nice is to have smooth
> interpolation along each face.  Michael, do you have a sense how hard
> it would be in agg (and other backends) to do a linear gradient
> interpolation over a quadrilateral with one RGBA at each vertex?
>
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-- 
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA


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