Tom Melly wrote:

> "Micha Riser" <mri### [at] gmxnet> wrote in message
> news:3d3a6e8b@news.povray.org...
> 
>> two ior values defined. Which one does POV use?
> 
> Since ior is defined in the finish a surface property), the overlap is
> irrelavent?

As Warp said ior is a interior property. It is allowed to be specified in 
finish only for backwards compatibility. See chapter 6.6.1 of the 
documentation.

I made some further test with CSG and ior. Obviously there is also a 
problem when objects with different ior ar merged together/intersected. 
Consider:

merge{ // or intersection{
  sphere{<-1,0,0>,2 pigment{rgbt 0.8} finish{ior 1.5}}
  sphere{<1,0,0>,2 pigment{rgbt 0.8} finish{ior 1.2}}
}

Note that here ior is specified in finish where it does no longer belong to.
What ior does the resulting object have? Testing showed that POV-Ray uses 
the ior value from the first object that has a finish{ior xy} defined for 
the whole object.

However if I specify ior in interior as

merge{ // or intersection{
  sphere{<-1,0,0>,2 pigment{rgbt 0.8} interior{ior 1}}
  sphere{<1,0,0>,2 pigment{rgbt 0.8} interior{ior 1.2}}
}

I get a different result. I cannot exactly say how POV treats this case 
though... anybody?

- Micha

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