TinCanMan wrote:
> 
> From what I understand, the ior value comes into play whaent he ray passes
> through a surface, so any time the ray passed through a surface of  either
> sphere, that sphere's ior value would be applied even if the surface is
> inside or intersects another surface.  On the other hand, if you apply a
> 'merge' to these two spheres, the surfaces inside the intersection are
> removed so the image would come out quiet different looking.
> 

But when the spheres are merged a ray on the x-axe coming from -x to +x 
would enter the merge at ior from the the first sphere. But the point where 
it leaves the merge (<3,0,0>) the surface would have a different ior which 
leads to the same problem as described in chapter 6.6.1 when ior was a 
surface property.

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