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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