>  You should be more specific about what do you mean by solid because it's
>not an unambiguous term.
>  Do you mean that the surface of the mesh is partially transparent and
>because of that you can see that the object is only a surface and not
>thoroughly filled with substance?
>  Or are you talking about CSG?

I declare lava in an include file and the following is the texture,
finish...for the lava.

It turned out the object is only a surface and not thoroughly filled with
substance.

I also replaced lava by a sphere and it turned out nice.

object{ lava

  texture {
                pigment {color MediumSpringGreen transmit 0.7 }
        }
        finish{ diffuse 0.65 specular 0.35 roughness 0.02}
  interior {  ior 3.1
                media {
                        emission <0.5, 0.2, 1.0>
                                        }
        }
  double_illuminate
    }

Thanks,

Connie

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