Alain wrote:
> When you shoot rays at a sphere_sweep, you need to cover the whole 
> bounding box, witch in turn, must completely enclose the whole extent of 
> the sweep. In most cases of large sweeps, the bounding box is almost 
> empty, leading to very poor success percentages, and extended trace 
> times. Breaking the sweep in smaller sections and puting those in an 
> union can realy improve the effeciency.
> In practice, a sphere_sweep using linear_sweep DOES looks exactly the 
> same as spheres connected by cones as the radius can vary. As a bonus, 
> you get rid of those pesky artefacts by using spheres and cones.
> 

So then why not program POV-Ray to automatically break up linear_sweep 
sphere_sweeps into spheres and cylinders/cones?  If the end result is 
the same, why do it any differently?

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