John,
That is an excellent idea. Thanks for the input. I
will definitely take a look at the mixed immediate
mode rendering. Maybe we can collaborate as this
thing progresses. I appreciate your time and effort.
-Mark
--- John Oliver <[EMAIL PROTECTED]> wrote:
> Just throwing in MHO... some opinions about making
> simulations that I didn't
> find, and since learned, after I started Java3D not
> too long ago.
>
> I'm pretty much a novice with Java3D but I'm making
> some good progress with
> simulation stuff (more of the particle system &
> physics based animation
> type). At first I tried using the scene graph and
> behaviours, but that soon
> became very complex (and too much code and I'm
> lazy). Then I tried "mixed
> immediate mode" rendering and everything clicked.
>
> The thing is, I had a good idea about how to program
> my simulation, that is
> the physical model and calculations to control it,
> but I didn't have the 3D
> visualization. I wanted to add the 3D "separately".
> That's how I'd usually
> go about making stuff anyway; design/make the
> logical, process stuff first,
> get that working, and wrap the visual stuff around
> it -- a
> Model-View-Controller design more or less.
>
> It seems to me that the Java3D scene graph and
> interpolators/behaviours is
> just the ticket if you're making an interactive
> animated presentation. In
> that case the scene and objects and behaviours IS
> the simulation. But if you
> are simulating some kind of process, where you have
> the model in mind or
> designed already, then Java3D can also be used as a
> view into that
> simulation model. The nice Java3D guys gave us
> immediate mode rendering too,
> I guess for this reason.
>
> The "mixed" immediate mode rendering would let you
> do both, using the
> regular scene graph for static (and simple
> behaviour) parts of the scene
> (walls, floor, background, conveyor and belt) then
> immediate mode can draw
> in some boxes on the conveyor belt in positions that
> your simulation model
> will know they should be at any given time
> (start-position + sim-time *
> belt-speed etc.). No adding/removing from the scene
> graph is needed at all.
> Use Java3D's rendering loop to update the simulation
> by whatever time passed
> since the last rendered frame. In your case
> something sort of like:
>
> class MySimCanvas3D extends Canvas3D {
> /** Time (ms) of start of simulation. */
> long t0;
> /** Draw in this context. */
> GraphicsContext3D gc;
>
> public MySimCanvas3D() {
>
> super(SimpleUniverse.getPreferredConfiguration());
> t0 = System.currentTimeMillis();
> gc = getGraphicsContext3D();
> }
>
> /** Overides Canvas3D's method to render sim
> stuff in mixed immediate
> mode. */
> public void renderField(int fieldDesc) {
> // update your sim to current time ...
> // put boxes on belt
> gc.setModelTransform( a-transform-of-a-box
> );
> // draw boxes
> gc.draw( a-conveyor-box-shape );
> }
> }
>
>
> Cheers,
> John
>
>
>
> ----- Original Message -----
> From: "Mark Beckman" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, September 04, 2000 1:45 PM
> Subject: [JAVA3D] Java 3D for simulation
>
>
> > Hi Folks,
> >
> > My client has asked me to build a simulator for
> their
> > conveying system using the Java 3D API. Here are
> some
> > questions that I have regarding this effort.
> >
> > (1) Has anyone out there used Java 3D to model
> and
> > give behavior to a conveyor belt system (or
> similar
> > transport device)?
> >
> > (2) Given a section of the conveyor system, how
> would
> > you add and eventually remove an object (e.g. a
> box)?
> > In otherwords, can I add/remove an element to/from
> a
> > scene-graph during runtime??? Or is there a
> better
> > approach???
> >
> > I am new to the Java 3D API. I would like to
> speak
> > with anyone who as been involved with the creation
> of
> > simulators using the API.
> >
> > Thank You,
> >
> > Mark Beckman
> >
> > __________________________________________________
> > Do You Yahoo!?
> > Yahoo! Mail - Free email you can access from
> anywhere!
> > http://mail.yahoo.com/
> >
> >
>
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