HF-s are not closed off per se, i.e. there is no 'lid' added to the bottom. But
unlike meshes, they do have a well defined interior and work predictably in CSG
constructs. Basically, everything below the HF-s surface is considered to be
inside it. So what you want to do is quite possible.
--
Margus Ramst
Personal e-mail: mar### [at] peak edu ee
TAG (Team Assistance Group) e-mail: mar### [at] tag povray org
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