Hello Jean,
The problem you are describing sounds like a problem that we used to have
when we where updating the camera using a behavior. I had done many tests on
that problem and in our case; I was able to resolve the problem by updating
the video drivers (I know it doesn't make whole lot of sense; but we had
gone back and forth with the
J3d team and put a lot of effort into resolving this problem). I should
mention that we haven't come across this problem with the newer releases of
j3d; therefore, there is a good chance that installing the latest version of
j3d could solve your problem. In the cases that I tested, even through the
camera's Transform (ViewPlatform's Transform) was being updated every frame,
the update would not take effect unless the window was moved/ resized ... .
This problem would only come up when the behavior thread would get
"expensive enough". I had confirmed that the values in the Transform were
getting update. In fact, I could see that the directional light attached
under that transform was being updated, but the camera would not get affect
by the new transform passed in.
I hope this helps you in resolving your problem.
Take Care,
--------------------------------------------------------------------------
Syrus Mesdaghi Fullsail Real World Education
3D Gaming Instructor Winter Park, FL
[EMAIL PROTECTED] www.fullsail.com
--------------------------------------------------------------------------
----- Original Message -----
From: "Jean Laleuf" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, February 23, 2001 8:55 PM
Subject: [JAVA3D] Head Tracking problems in j3d1.2 (take 2)
> So I'm a moron and forgot to attach the source files. ;) Sorry about that.
> Here's a repost.
>
> > I'm having a problem with headtracking in java3d. Something
> > (either the canvas or the userHeadToVworld transform or something
> > else I'm missing) is not being updated regularly and so the
> > viewing frustum doesn't change as I move my head around.
> >
> > I can force the update by moving my mouse in and out of the
> > window border or by moving another window over the java3d frame.
> > Overloading the head tracker's input device's
> > pollAndProcessInput() method indicates that this method is being
> > called regularly. However, polling the View's userHeadToVworld
> > transform every 30ms indicates that this transform is *not* being
> > changed. It gets updated only when I force a refresh through the
> > window manager. So although there's a thread asking the
> > InputDevice to make data available, that data never makes it to
> > modify the userHeadToVworld transform.
> >
> > I'm attaching my source code. It's rather simple. The scenegraph
> > is a set of 27 ColorCube instances, arranged in a cube. The
> > viewplatform is sitting at the origin, and the head I think I've
> > set the PhysicalEnvironment, PhysicalBody, View, etc. up
> > correctly, but obviously I'm missing something. Maybe things have
> > to be set up in a specific order?
> >
> > I was also going through some old posts and found references to
> > an extended SimpleUniverse class (ComplexUniverse, maybe?) which
> > can configure more complex setups (a headtracked environment, for
> > instance) through a properties file. Is there any more recent
> > news on this? Will it be made available at any point in the future?
> >
> > My system setup: a Sun Ultra10 w/ an Elite3Dm6 card, a pair of
> > CrystalEyes for the stereo, and some old Logitech 3d mouse-type
> > ultrasonic trackers for the head tracking. (Many thanks to Eric
> > Engstrom for the 3d mouse driver, btw) I'm running Solaris 7,
> > jdk1.3.0 and j3d1.2
> >
> > If anyone has any ideas, please let me know.
> > Thanks in advance,
> > -Jean Laleuf
> > ([EMAIL PROTECTED])
> >
> > ps. I'd like to reiterate Blaine Bell's request for more details
> > on the various policies and settings of the View model. Appendix
> > C of the j3d spec is ok, but leaves a lot out and is short on
> > examples. Maybe someone who understands it well could write
> > something up and send it to Justin so it can be added to the FAQ?
> >
>
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