One of the problems with B6.1 is that re-importing a converted Bryce boolean mesh results in a mesh that doesn't behave like it ought to. If this were a cube you'd probably have 6seperate flat meshes that won't 'solid when boolean' or in fact boolean at all.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...