"Amir_ni" <nomail@nomail> wrote in message 
news:web.498aa9d13b9d3d08792c7d270@news.povray.org...
> Is it possible to make the shape of that cavity as an
> independent object like a sphere so that I can use illumination features? 
> I
> mean, when I use """  finish{ambient 0.3 specular 0.5 reflection 0.4}  """
> inside the difference command block, I think it doesn't illuminates the 
> new
> shape, but it first illuminates the sphere and then make a geometrical
> subtraction (though I may be wrong). I want to do some illumination effect 
> on
> the object so that when I turn the camera, the gloss and other effect can 
> be
> observed.

You should be able to add the finish straight into the 'difference' after 
the 'pigment' definition, or you can place both inside a texture block:

  texture {
    pigment{ color rgb<1,0,0> }
    finish{ambient 0.3 specular 0.5 reflection 0.4}
  }

The 'difference' is a CSG operation (Constructive Solid Geometry) and the 
result is an object that almost always behaves in the same way that 
primitives such as the sphere do.

Regards,
Chris B.

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