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Andrew Coppin <orp### [at] btinternet com> wrote:
> intersection
> {
> plane {...}
> plane {...}
> plane {...}
> ...
> }
> will POV-Ray make an automatic bounding box?
AFAIK, no.
POV-Ray has no way of knowing the boundaries of an intersection composed
of any given objects. (In the case of planes it would be possible to
solve the boundaries mathematically, but usually there are other objects
than planes as well.)
> Or should I add one manually to speed things up?
In this case yes. Try it to see if there's any speed difference.
> Also, if I do add one, do I need to turn off manual bounds
> removal (-UR)?
I think that POV-Ray only removes user-defined bounding boxes when they
are "bigger" than the one calculated automatically. As POV-Ray has not
calculated any bounding box automatically, then the user-defined one is ok.
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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