Hi Mark, Thanks for the response!
The framerate does not appear to be effected by the size of my window. I
get the same whether im running 512x512, 1024x768 or Fullscreen. I am
running DirectX on a 700 mHz PIII using a Tnt Ultra(I think). But I have
not tried shrinking it down to very small. Perhaps I am calculating the
frame rate wrong. I an counting frames by incrementing a long in the
postSwap() method. After 5000 ms (5 sec) I print out (frames * 1000 /
elapsedMS) which should yield frames/sec and then I reset the counters. One
thing I notice is that postSwap is not called if I am not moving, which
means it is not making a frame unless I am "moving" or transforming. Since
I am implementing my movement transforms in a timed behavior with a
resolution of 20ms perhaps this is the current limiting factor. If I set up
a interpolator and transform an object (like rotate an object) I bet it
would be forced to attempt to render more frames per second.
As to my fire question. I guess I was looking for general rules of thumb
regarding fps. I am navigating through a static scene at 18 fps and it
seems very smooth to me. Does that mean that 18 fps will look good no
matter what was happening in the scene? Does the human eye distinguish
things differently? In other words if I was standing still and looking at
an object animating moving from right to left, does my eye notice the "gaps"
in its location below a certain framerate. But when I am moving, the eye is
too busy noticing the fact that the whole scene is changing to notice the
"gaps".
Hope that makes some sense.
Dave Yazel
> ----------
> From: Mark Ferneau[SMTP:[EMAIL PROTECTED]]
> Reply To: Discussion list for Java 3D API
> Sent: Monday, August 28, 2000 12:27 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [JAVA3D] Performance, LOD and optimization
>
> Dave,
>
> It looks like you are doing some really interesting work, especially given
> the domain for the image URLs you provided earlier today. I have to be
> honest that I don't think anyone can realistically answer your questions
> without much more information.
>
> At 10:07 AM 8/28/2000 -0400, you wrote:
> > Q: What kind of FPS should I be seeing?
>
> What platform are you running on, what size is your rendering window, are
> you using OGL or D3D?
>
> > Q: Am I maxing out at 18 fps because I don't have anything in
> the
> >scene moving faster than that? I have no interpolators going, no timed
> >behaviors except my keyboard.
>
> Not likely, depending on your rendering window and graphics hardware, you
> are likely either fill bound or transform bound. Fill bound means that
> you
> are trying to fill too many pixels on the screen and you don't have the
> pixel fill to do so. Transform bound means you have too many vertices in
> the scene that are being processed--this really becomes an issue with
> multiple lights in your scene, especially spot lights. One test for
> finding if you are fill bound is to decrease your rendering window size to
> 60x60 or, better still, to a much small version of what you have now but
> at
> the same aspect ratio. If you performance jumps you are likely fill
> bound.
>
> To see if you are transform bound, use LODs to decrease the number of
> vertices in the scene, decrease the number of lights, etc.
>
> > Q: If I want to do an animation like rotate a transparent GIF
> over a
> >transparent cylinder (for a fire effect), how many FPS do I need for it
> to
> >look realistic?
>
> What kind of fire are you trying to reproduce? Fire in a fire place, fire
> on a stove, forest fire, fire ball, etc? How important of an element is
> the fire to your scene? Depending on the answer to this question the
> speed
> could be lower or higher. In general it will depend on how much your
> textures need to move to generate the effect you desire. If they have to
> move a lot a higher framerate will be required to make the motion not look
> jerky.
>
> --Mark
>
>
>
>
> Mark Ferneau 240-462-6262 (cell)
> Director of Adv. Technology 801-437-4608 (efax)
> Xtivia Technologies, Inc. 732-469-5954 x629 (NJ office)
> [EMAIL PROTECTED] 301-279-5703 (home office)
> http://www.xtivia.com/ [EMAIL PROTECTED] (wireless email)
>
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