Dan,
Looks good. Couple of comments:
If you take out this check, you will see the problem with Text3D. Input a 3
digit number and strange things happen...
if (ff.floatValue()>-99.99f && ff.floatValue()<99.99f){
You check the string for changes every 1000 ms. It might be better to use
the Behavior.postId method or update the string directly in the UI, that way
the behavior scheduler won't have to do anything with your behavior. [If you
have only one string though, this is probably just syntactic sugar].
The usual problems with Billboards apply, they burn objects at a hell of a
rate, don't work with multiple views, and quickly become impractical. You
can't practically have a scenegraph with 100 Billboards in it, performance
dies.
BUT, don't get me wrong, what you've done works, and for your application
perhaps it will see you through. For one of your first Java 3D programs it
is very good - it certainly took me a while to get my head around Behaviors!
Sincerely,
Daniel Selman
[EMAIL PROTECTED]
http://www.tornadolabs.com
-----Original Message-----
From: Discussion list for Java 3D API
[mailto:[EMAIL PROTECTED]]On Behalf Of Dan Todor
Sent: 11 December 1999 03:02
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] A good example of dynamic scene changes
Daniel,
Thanks for the advices.
Take a look please at the attached code. It's one of my first tries when
I've
got Java 3D. Please excuse the parseTemp function, at the time I wasn't too
close to Java, I was just experimenting and haven't read the format classes
, so
I wrote my own formatter. I needed something like a temperature displayer
class
wich I could send a value and a position in the 3D universe. It works...
Right
now I have attached to it a Billboard behavior so it will face allways the
user,
no matter his position.
Daniel Selman wrote:
> Dan/Steve,
>
> As far as I know there is no way of changing the geometry within a Text3D
> after it has been created. The setString method will merely *append*
> geometry to the internal GeometryArray, regardless of what is passed in.
>
> SUN were supposed to revise some of the Text3D methods for 1.2 however, so
I
> might be out of date.
>
> This will leave you with:
> - creating and destroying Text3D objects dynamically. This could be very
> slow, as Text3D objects can become very complex, and it is hard to
> impossible to control the vertex count. You will probably also need
> behavior(s) to align/scale the Text3D relative to the viewer. You may leak
> Text3D memory.
>
> - don't use Text3D, use Text2D or a Raster. This will allow you to update
> the labels but (may) leak texture memory instead. You won't have to align
or
> scale the labels.
>
> - write your own Text3D class that allows on the fly updating of geometry.
> Quite a big project in itself, but would be a very useful utility. There
is
> probably quite a bit of OpenGL code that you can adapt for this.
>
> Best of luck,
>
> Daniel Selman
>
> [EMAIL PROTECTED]
> http://www.tornadolabs.com
>
> -----Original Message-----
> From: Discussion list for Java 3D API
> [mailto:[EMAIL PROTECTED]]On Behalf Of Dan Todor
> Sent: 10 December 1999 02:40
> To: [EMAIL PROTECTED]
> Subject: Re: [JAVA3D] A good example of dynamic scene changes
>
> >From what I have tried, you can put any text, then change it in a
behavior,
> but
> only the EXACT number of characters that you send for the first time to
the
> Text3D object. If you send one character in plus or minus, everything
> becomes a
> mess. Haven't yet tried out padding with spaces... Anybody has some
> experience in
> this field ?
>
> Steve Sampson wrote:
>
> > Andy,
> > Great Demo. Wow!
> > What I have is an array of strings that I want to display as 3D objects.
> > And as the program runs, the text changes. I can display the text ok,
> > just not change it.
> > Any help, code or hints would be greatly appreciated.
> > thanks
> > Steve
> >
> > At 08:56 AM 12/9/99 -0600, you wrote:
> > >I wrote a J3D application about 8 months ago which allowed the user to
> > >visualize a ship's motions in regular waves. (The results were
> > >pre-calculated by a commercial hydrodynamics package). Tha java
> application
> > >had to dynamically change the wave profile, and the position of the
boat
> as
> > >a function of time. As the scene was changing the user could transform
> the
> > >scene with the mouse. (The scene's 'dynamic' change was made in
another
> > >thread). You can download the application from:
> > >http://www.wsatkins.co.uk/asas-aqwa/download.htm - Choose AQWA
Sequence
> > >Player 4th from the bottom of the list).
> > >(Just put garbage in the form fields when asked)
> > >
> > >If this is the sort of example you are looking for let me know and I
will
> > >send you some code.
> > >
> > >Regards,
> > >
> > >Andy Phelps
> > >
> > >>Hello,
> > >>Does anybody have a good example of dynamically changing what is
drawn.
> > >>Or as least tell me where to look? I have a list of thing I want to
> draw,
> > >and as the program runs the list changes and the scene should change as
a
> > >result. I understand how to move and rotate objects, but I wish to be
> able
> > >to dynamically change objects.
> > >>thanks for any help.
> > >>Steve
> > >>
> > >
> >
> >
>
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to
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>
> --
> Best regards,
> Dan Todor
> ---
> You can have it done FAST | \
> You can have it done RIGHT | | --- Pick any two.
> You can have it done CHEAP | /
>
>
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>
>
===========================================================================
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--
Best regards,
Dan Todor
---
You can have it done FAST | \
You can have it done RIGHT | | --- Pick any two.
You can have it done CHEAP | /
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