When is it recommended to create bounding objects? I thought bounding
clipped objects was a good idea, because only a small part of the object
surface is visible and has to be rendered, like this:

sphere{  0*x, 1
  clipped_by{cylinder{.8*x, 1*x,.6}}
  bounded_by{clipped_by}
  pigment{color Red}
}

But PoV-Ray doesn't agree and removes it ("warning: Unnecessary bounding
object removed.")

btw, are cylinders good bounding objects?

TIA
--
Daniel Pirch
nap### [at] linuxzrztu-berlinde

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