'bounded_by' is still going to be for manual bounding of objects and
'clipped_by' for clipping (cutting away) objects.  'contained_by' has apparently
been used to distinguish between the usual bounded_by usage so as not to confuse
it when creating a isosurface.  The reasoning beyond that is unclear to me
except that the terminology now means it is a container area of sorts instead of
just a ray trace boundary.

Bob

"Greg M. Johnson" <gre### [at] my-dejanewscom> wrote in message
news:38BFBC8A.946FB33E@my-dejanews.com...
| When should one use any of the above,  such as bounded_by ?
|
| I'd never heard of "contained_by" until I got an error message
| attempting caustics in 0.4...
|

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