Hello,

on playing with isosurfaces I managed to create a spiral spring, but
rendering took quite some time. So my idea was to replace the containing box
by a tube, i.e. a difference of two cylinders.Of course, it didn't work, and
re-reading the manual taught me that boxes and spheres are the only possible
isosurface containers.
Now my questions are: Does anybody know if additional containers are planned
in future releases? Can I expect a considerable reduction of rendering time
if I reduce the container size as far as possible (without cutting the
isosurface)?

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