Zeger Knaepen <zeg### [at] povplacecom> wrote:
> 'inside_vector', just like 'hollow', seems to be kind of magical to a lot of 
> users...  AFAIK there is NO NEED to specify inside_vector if you want to use 
> a properly closed mesh in CSG, since the default will do just fine.

  I think you are confusing meshes+CSG with meshes+media.

  The inside_vector indeed has nothing to do with media or other 'interior'
features, and would be completely needless with them. As long as the mesh
forms a closed surface, media inside it will render just fine.

  However, inside_vector *is* needed for intersection, difference and merge
CSG to work properly with meshes. This is because these operations require
to know if a given point is inside the mesh or not. If you don't use it,
POV-Ray won't be able to calculate CSG properly in all situations.

-- 
                                                          - Warp

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