That sounds right... in the first example there is a small slice of the plane that is
causing a second application of the ior value... as in this example:

 cylinder { z*-3,z*0, 3
            pigment { rgbf <1,0.7,0.7,1> }
            interior { ior 1.95 }
          }

 cylinder { z*13,z*0, 1
            pigment { rgbf <1,0.7,0.7,1> }
            interior { ior 1.95 }
          }

when you render this you can see that the smaller cylinder is causing a similar
effect.

Josh

eng### [at] spiritonecom

Spider wrote:

> When you have the testure on the objects, adn do a intersection/difference, the
cutting
> objects material is applied ABOVE the base objects texture..
> I think this is what you see...
> (spoken in uncertanity)
>
> //Spider
>
> Ken wrote:
> >
> > If I have an object constructed using a CSG operation I get
> > two different results in the rendered object if I apply the
> > pigment and interior properties to the different pieces
> > versus the CSG as a single object ( see example ).
> > The difference is quite visible.
> >
> > Why ?
> >
> >  intersection{
> >    cylinder{x*-3,x*3,1
> >     pigment{rgbf<1,.7,.7,1>}
> >      interior{ior 1.95}
> >   }
> >
> >   plane{-z,-0
> >    pigment{rgbf<1,.7,.7,1>}
> >     interior{ior 1.95}
> >   }
> >  }
> >
> > vs.
> >
> >  intersection{
> >
> >  cylinder{x*-3,x*3,1}
> >
> >  plane{-z,-0}
> >
> >   pigment{rgbf<1,.7,.7,1>}
> >    interior{ior 1.95}
> >  }
> >
> > --
> > Ken Tyler
> >
> > tyl### [at] pacbellnet

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