Le 26/06/2011 17:34, posfan12 nous fit lire :
> On 6/23/2011 10:03 PM, SharkD wrote:
>> How do I create a paraboloid where a slice through the object produces a
>> circle of a fixed and known size? Thanks!
>>
>>
>> Mike
>>
>>
> 
> OK, next challenge: the focus of the parabola must be located at the
> center of the circle! I want to create a solar collector and need to
> know the precise dimensions beforehand.
> 
> 
http://en.wikipedia.org/wiki/Parabola

focus at <0,0,1/(4*k)>

for equation of paraboloid z= k(x²+y²)

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