Run your program with -verbosegc and see if the garbage collector is running
often. If so, it could be that you are allocating a lot of objects in the loop
somewhere. A good Java3D program won't allocate ANY objects (if possible).
Zero garbage collection. All CPU goes to make 3D go fast :) i've gotten my
little programs to only garbage collect about once every 20 seconds (keyboard
events, etc). Even then it is only for a tiny tiny fraction of a second.
Mike
ZACZEK, MARIUSZ P. (JSC-DM) (NASA) wrote:
actually the model does not seem to have much affect on the speed...as a
matter of fact I used a 2kb model and same issues with frame rate. These
were the results of frame rates I posted before:
Ok, here is the test results on a DIFFERENT machine:
Dell 2.4 Pentium 4, 256 Mb ram, Nvidia Geforce2, Windows 2000
ISS model (955 KB) Test Model (2 KB)
(1) Normal Run 31 fps 35 fps
w/ animating sliders
(2) no animating sliders 38 fps 46 fps
(3) earth texture reduced
by 50 % ... anim. sliders 31 fps 34 fps
Mario
(4) reduced earth texture 39 fps 46 fps
no animating sliders
yes I can get to 46 fps if I get rid of the animated sliders but that's
about it....this translates to about 10 fps on the slower machines I
mentioned before. SO I'd still like to raise the overall fps so even the
slow machine can be a bit more bareable.
Oh and the sphere (earth) is absolutely crappy. If you get close to
it you can see the angles of the sphere...I think I have no more than
20 divisions in that sphere. And the sun sphere is simply a VRML object
that is the default VRML sphere and has very few polygons as well.
The only think that I can figure after all the suggestions is that my code
may be poorly written.
When I run my program it uses over 60,000 K on windows 2000...this must mean
I have way to many variables and things defined. I'm going to have to go
back and try to minimize things a lot more.
thanks for the help, everyone!
Mario
NASA Johnson Space Center
-----Original Message-----
From: Michael P. McCutcheon
To: [EMAIL PROTECTED]
Sent: 1/10/2003 9:12 PM
Subject: Re: [JAVA3D] ? Frame Rates ?
Just to let you know...here is my system:
Pentium 2 450 Mhz.
512 MB memory
TNT 1 Graphics card
Windows 2000 (and Max OS X :)
JDK 1.4.1_01
Java3D 1.3.1 beta1
For scenes of similar complexity I get roughly 30-60 FPS. (nothing
scientific,
but suffice it to say that it can be 'smooth', even on old computers).
I think that you must be using some terribly large textures or
super-super
acurate spheres or something. Also I look at the small model...I
suspect it
was exported from a CAD tool or something with LOTS of polys. Exporters
can be
pure evil :)
With a computer as fast as yours...you should be able to get 40-60 FPS
out of
something like that, easy. Scale your models accuracy and texture size
down.
I bet you'll be surprised how fast you can make it.
Mike
ZACZEK, MARIUSZ P. (JSC-DM) (NASA) wrote:
Hi,
I have a program (picture attached) which has a canvas3d and couple
of
canvas2d's and a swing interface.
When I run this program (with the canvas3d animation running) on a
Pentium
3, 900 Mhz, 128Mb Ram, Nvidia TNT2,
I get pretty crappy frame rate and graphical update. I'm talking about
5
frames/second. This includes the
animation of the mercator projection and the plot which are at the
bottom of
the display.
What I want to know is do any of you have any suggestions for how to
improve
the frame rate. Could my
code be so badly written? I try to minimize the number of Transforms
and
Groups as possible. I did notice
that having my sliders be updated by my animation slows me down some
so I'm
going to have flag to not
have them get updated if the computer is too slow. But I'd still
appreciate
any other advice...and
also, is there any code out there that one could run and have it
output the
framerate....so that I could
use that code and test the machines out to see what framerates are
possible?
I know there is a Java3D FAQ regarding speed up and I've read it. The
thing
that worries me about my code
being slow is that I know people are making Java3D games and I imagine
they
must be fast enough to play
so they must be doing something right.
Mario
Mariusz Zaczek
NASA - Johnson Space Center
Automated Vehicles and Orbit Analysis / DM35
Flight Design and Dynamics Division
Mission Operations Directorate
Bldg: 30A Room: 3040A
Phone(W): 281-244-6650
Phone(H): 832-385-3860
Disclaimer: "The opinions, observations and comments expressed in my
email
are strictly my own and do not necessarily reflect those
of
NASA."
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