moray can do some of what you want, but it's difficult in the current
version.  you may want to try spatch instead and then export to moray. 
in spatch you can do sweeps of splines (including circles to make your
torus) and while it wouldn't be called morphing, you could make a pipe
go from circle to square as long as you made both with the same number
of points.  hopefully somewhere down the road moray will include a patch
modeller like spatch since in my opinion it doesn't look like it would
be too hard to make.  hamapatch is also out there but has varying
stability from release to release (i.e. not all the bugs are out).  no
pov modeller can do solid (3d) sweeps.  i also hope that down the road
moray will include a mesh modeller as well.

Stan wrote:
> 
> 1. Can I do a sweep on a 3D object in Moray 3.2? Ex: rotational sweep on
> a cube around the axis which is the longest line segment that can fit
> inside it cube.
> 
> 2. The bezier patch has control points outside the mesh, so how is it
> not qualified as a NURBS? Just because it's a surface?
> 
> 3. Some modelers let you make polylines/splines and 2D shapes that you
> can use as paths and cross-sections for elaborate sweeps and extrusions.
> Ex: sweeping a circle perpendicular to a circular path creates a torus.
> Programs also offer morphing to make a pipe whose cross-section turns
> from circular to square. Moray doesn't offer too many 2D shapes, except
> infinite planes and disks. Can I do sweeps along a path in Moray?
> 
> 4. If I want to do an origami-like model, how do I specify properties of
> paper? i.e. Paper folds perpendicular to straight creases. Bezier
> patches behave more like rubber. What should I do?

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