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J Kim <sjy### [at] shinbiro com> writes:
>
> I understand there is a sphere-sweeping function(sphere-sweep-spline)
> in the superpatchPOV. Would it be possible to start from something else
> other than a
> sphere? For example, sweeping with some egg-like primitives, or
> triangle-shaped sphere-variants, or torus along a predefined curve/path.
> If I could possibly choose a torus as a starting primitive for the
> sweeping, that would generate a hollow tube, or pipe.
> I would like to know whether this is some sort of built-in function by
> changing some options in the patch, or somewhat involving task like
> writing lines-and-lines of programming.
As far as I know, it the latter case is true. The implementation of the
sphere_sweep object is tied with the shape of a sphere. In fact, there is
no object swept internally. The shape of the sphere_sweep has been
calculated "by hand" up to parameterization. By this, the intersection of
the ray and the sphere_sweep can be determined efficently.
Perhaps you should have a look at the original page of the creator of this
patch:
http://www.informatik.uni-bremen.de/~vader/pss/pss.html
When you want to sweep other objects, I suggest that you create a bunch
of objects. This can be done either directly or with one of the various
macros mentioned by others.
On the other hand, substracting two sphere_sweeps with different radii
may be close to your desired torus_sweep.
Happy tracing
Thomas
--
http://thomas.willhalm.de/ (includes pgp key)
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