Choosing a 3D Engine for Java

Hi.
I've been looking at the options of 3D engines for Java. Obviously, the first place I looked was at Java3D. But I've heard that it can be slow at times - I also happen to think it is a good, high-level API.
I've looked briefly at products such as gl4java, VTK and Jazz3D.
I'd like to know some pro's and cons for Java3D, and the above, and other, engines.
What I need is X3D support, and the ability to draw shapes over a background image, and of course, for this to be fast : )
I'm hoping you can give me some idea as to which APIs are better.
thanks
james

There are others too...
A JOGL-based scenegraph-API like xith3d...has no website i assume, but here's a thread about it:
http://www.javagaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=jogl;action=display;num=1060308805
Openmind (mentioned before, but here's the link):
http://www.mind2machine.com
jPCT (a little different from the others, because it does software and hardware rendering...anyway...):
http://www.jpct.net
and a thread about it:
http://www.javagaming.org/cgi-bin/JGNetForums/YaBB.cgi?board=3D;action=display;num=1061478645
There are even more, but most of them are rather outdated and unsupported. Hope this helps.

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hi
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PS: Rewarding points will be given for helpful answer.

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Hi Rameez,
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%>
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How do I add one of the table.SetDataFields() to my report to be displayed?
Are there any other pointers or suggestions you may have?
Thank you

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am trying to develop a database engine for mobile devices.. it is to develop a miniature version of the DBMS that
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I'm sorry for the amount of time it took me to get back. Derby is an open source database written entirely in Java. I do not know if it can support resource constrained devices like MIDP compliant, but may work okay with CLDC.
But outside of Derby being a solution, let me give you a few ideas off the top of my head.
Set up a database server in a separate thread. This server will really be your controller for RMS access.
Since RMS is just a big sequential 'pipe' you will have to think of data as 'frames' - (starttable) (tableID) (tablename) (data) (tablename) (data).....(endtable).
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When you need to retrieve data, thing are more complex.
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Positive:
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2. When looking for data, data may* be found without searching through the entire table. This is accomplished with RMS filters or logic test within the RMS read loop.
Negative:
1. Slow when all data of a table is needed (i.e. compute sums or averages of entries). The entire RMS database must be read to ensure all the entries are searched. An example of how this is a problem is as follows: You have 5000 entries in you RMS database resource and you are looking to compute the average of a value in some table. When you first wrote the data to the table, it was done sequentially and no other data for that table exist. But we can't tell if that's the case, so we have to read through all 5000 entries to make sure we looked for every piece of data.
Beacuse of this issue, this database structure, performance may be fine for 50K - 100K entries (depending on table element size), if the reading requirements don't force full data reads. Otherwise, 25K may be an upper limit.
I hope this helps.
Edited by: estarkey on Mar 17, 2009 9:15 PM
Edited by: estarkey on Mar 17, 2009 10:01 PM

Choosing a 3D Engine for Java

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