Re: [brlcad-devel] Revolve primitive and hyperbolas...

[Matt S. <ma...@sh...>]

Drats!

OK, I guess the first step is to then go back to first principles and figure
it out for myself...  Oh well, recreational geometry is really not what I
would consider a chore :)

-Matt-

On Wed, Oct 5, 2011 at 4:45 PM, Christopher Sean Morrison <br...@ma...>wrote:

>
> On Oct 5, 2011, at 11:54 AM, Daniel Roßberg wrote:
>
> > Unfortunately I've no resources at hand at the moment.  I can't even
> > find Timothy's proposal for Google SoC 2008.
>
> Looks like access to all previous year GSoC projects is disabled now that
> GSoC for this year has ended.  There is some information at
> http://brlcad.org/wiki/Revolve_Primitive
>
> > Nevertheless I can tell you something about the hyperbola: It's the
> > rotated ray.  The idea was not to rotate every sketch-segment but only
> > once the ray.  This gives you a hyperbolic surface which has to be
> > intersected with every line-segment from the sketch.
>
> What makes it a hyperbolic surface?  I don't dispute that it does, but I'm
> having trouble visualizing how that's true for a generalized revolve
> surface.  Take the simple case of a square revolved to make a cylinder --
> wouldn't the ray path parameterized through the solid result in a partial
> ellipse instead of a hyperbola?
>
> Cheers!
> Sean
>
>
>
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