I'm hoping someone can clear up some confusion I'm feeling.

In the CSG Intersection documentation for POV 3.1, it says that 
intersection leaves just those portions of the two object which exist 
within both objects.

A plane is an infinately thin object which extends infinatly in two 
directions.

Therefore, it would seem to me that, if you intersected two planes, you 
would get a line; if you intersected three planes... provided they 
intersected at all... you would get a point.

But if I do:


   intersection
      {
      plane { -y, -0.555 }

      plane
         {
         x, 0
         rotate -4.3012223*z
         translate <.59831012, .555, 0>
         }

      plane
         {
         -x, 0
         rotate 4.3012223*z
         translate <-.59831012, .555, 0>
         }
      }

   scale <1, .5, 1>
   }

I get a strange, flat-bottomed V shape.

Why?

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