Alan,

All in all Java 3D suffers from pretty bad "memory bloat".  We do use
shared groups extensively in Pernica (creating dozens of copies of some
fairly complex models - 4000+ vertices) and they seem "ok".

- John Wright
Starfire Research

Alan Brockett wrote:
>
> Hi,
>
> I'm new to Java 3D and building an app that allows the user to create a
> sequence of "scenes", each of which contain any number of props, such as
> buildings, trees, vehicles.  The props will typically be VRML or OBJ, loaded
> with one of the standard loaders.  Number of props per scene will be on the
> order of 20-50.
>
> Many times a scene will be mostly a copy of a previous scene, e.g. same
> buildings but with vehicles in different positions, maybe a few new ones.
> So, it would be nice to not have multiple copies of the geometry in the
> scenegraph.
>
> I've just finished reading all of the posts to this list on cloneTree and
> SharedGroup.  Seems that SharedGroup had a significant performance/memory
> bloat bug in 1.3, and many (but not all) responders recommended using
> cloneTree instead.
>
> But there have been no posts for quite a while on this subject, so I'm
> wondering what the latest (1.3.1) advice is regarding the use of
> SharedGroups vs. cloneTree?
>
> Thanks for any help!
> Alan
>
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