JRG <jrg### [at] hotmailcom> wrote:
>>   An inverted box is infinite.

> No, it's not.
> At least not from POV-Ray's point of view (just try).

  In the given example, if I replace "difference" with intersection, the
object becomes finite (POV-Ray reports 1 object, 0 infinite). If I then
make the box inverted, it becomes infinite (POV-Ray reports 1 object,
1 infinite).
  By logic, making the box inverted makes it infinite. Difference inverts
internally the second and subsequent objects, which explain what is
happening.

  Clipping the whole object (with a proper clipped_by object) makes it
finite (POV-Ray reports 1 object, 0 infinite). This is logical because
now the object has been limited to the clipped_by object, which is finite.

-- 
#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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