In article <378db30c@news.povray.org> , "Daniel Pirch" 
<nap### [at] linuxzrzTU-Berlinde> wrote:

> 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.")

See the documentation section "Automatic Bounding Control", "Removing User
Bounding" and "bounded_by" and "clipped_by" which explains how and when to
use "clipped_by" and its differences regarding the other CSG operations.


     Thorsten

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