>> My recommendation would be to go as close to 0 as you can (e.g. 1e-6).
>> If you feel like it, you can add some hard-coded triangles from there to
>> (x,y,Y)=(0,0,0) to get a closed shape.
>>
>
> Plotting the triangles to (x,y,Y)=(0,0,0) or very near there is not
> going to produce nice/correct results. See the attached image. Those
> triangles would look very much out of place.

In my mind, the point RGB=0,0,0 corresponds to the surface that "caps" 
the bottom of your 3D shape. ie the one where Y=0 and is bordered by the 
classic "horseshoe". Any point on that "cap" would be RGB=0 because Y=0.

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