Dave Blandston wrote:
> Alain <ele### [at] netscapenet> wrote:
>> If you can't come close enough with a scaled torus, then, you'll proba
bly need a sphere sweep.
> 
> A sphere sweep combined with a prism may be a possible solution, becaus
e that
> would also work for the inside of the curves, but I think that would be

> extremely difficult to get just right. Plus I'd have to figure out how 
to
> remove the square notch that the sphere sweep would fit into. This migh
t turn
> out to be a really difficult problem to solve with CSG...
> 
	The square notch is actually very easy to do once you have the 
prism for the main shape and the sphere sweep: make the prism 
shorter by the radius of the sweep and add another prism using the 
same spline as the sweep (i.e think "union" instead of "difference").

		Jerome
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