> 
>   Your answer is technically correct, but a more helpful answer would have
> been an explanation about how to use several bicubic patches to form a
> larger surface with more control points. (The only problem is, naturally,
> how to join patches seamlessly.)
>   Perhaps I'll make a povQ&T entry about this...
> 

Could a 2d equation be created for the patches?  Then to get them to 
join seamlessly would just need the same tangent planes at the patches' 
overlapping points.  Or would the control points need to be figured out 
from equations that we make up ourselves?
Brendan

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