On 05.03.10 06:55, F. Hydrant wrote:
> Subtracting two isosurfaces to create a shell, portions of the shell where the
> inner (subtracted) surface should be visible are completely transparent.  Some
> shadows are cast by the invisible shell.  Other shapes I've tried do not do
> this.

You need to use all_intersections if you want to use isosurfaces like this 
in CSG. This is explained in the document section about isosurfaces, see 
<http://www.povray.org/documentation/view/3.6.1/300/>.

	Thorsten, POV-Team

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