hi Ronald,
sure, performance, frame rates, and so on, that all depends on what you
intend to do with J3D. We've tested J3D in an app, that creates and
manipulates a lot of scene graphes and objects at runtime and uses
animations with picking. every time you start an animation, the gc gets
stressed and the animation gets interrupted from time to time. take a
closer look to how picking is implemented in J3D and you'll know why. And
that is what i wanted to say.
I've tried continuous picking on an object consisting of about 15000
polygons. I got about 3 fps. (Viper 550, PII 350, 128MB).
We now have implemented all that by ourselves using only J3Ds rendering
engine in immediate mode. Things are running now much better and faster.
I remember a discussion here several weeks ago concerning prommanging
style. And exactly that is IMHO the main problem of J3D.
We've made an experiment to test the openGL performance of J3D. We've taken
a 3dlabs GVX1, one of the best openGL graphics card on the market. The
performance boost wasn't in that way we expected.
Gernot
[EMAIL PROTECTED]
Ronald Mourant
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Sent by: Discussion Subject: Re: [JAVA3D] Request for
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11.11.99 16:56
Please respond to
Discussion list for
Java 3D API
At 05:33 PM 11/10/99 +0100, you wrote:
>Hi,
>
>sorry to say that, but the most importent reason against J3D is its
>performance. Not because of the API but - IMHO - rather because of so
many
>*awkward* or complicated implementations. It would be real a good idea to
>make the sources public. This would give J3D a performance boost.
>
>Gernot
>[EMAIL PROTECTED]
>
>
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>
Yesterday we installed the Diamond Viper 770 NIVIDIA 32 MB card
in our 400 MHZ Pentium NT computer. Frames rates for a simple Java 3D
program went from 5-6 frames/second to 50-60 frames/second.
Ron
Ronald R. Mourant, Ph.D. Phone: 617 373 3931
Professor and Director FAX: 617 373 2921
Virtual Environments Laboratory
334 Snell Engineering Center
Northeastern University
Boston, MA 02115 email: [EMAIL PROTECTED]
U.S.A. http://www.coe.neu.edu/~mourant/velab.html
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