Mario -
I use the orbit behavior and the Transform3D "lookAt" in my application with OK
results. I have included some code snippets below, but I don't think I am doing
anything special. You need to do two things: update the orbit behavior focus point,
and update the view platform transform group. Hope this helps.
Matt
!!! IMPLEMENTING CLASS VARIABLES !!!
protected SimpleUniverse univ;
protected OrbitBehavior ob;
!!! METHOD TO UPDATE ORBIT BEHAVIOR & VIEW PLATFORM ORIENTATION !!!!
private void setView(Point3d eye, Point3d focus, Vector3d up, boolean autoSize) {
if (autoSize) {
// Modify the eye position by changing the distance from the focus
// point, while retaining the direction from the specified eye to
// focus points, so that the bounding box around the mode is within
// the field of view of the view.
!!!!! CUT - OFF TOPIC CODE !!!!!
}
// Create a Transform3d object, and set it to look at the focus point
// from the eye position with the specified up vector.
Transform3D initial = new Transform3D();
initial.lookAt(eye, focus, up);
initial.invert();
// update the orbit behavior center of movement to coorespond to the
// focus position we just set.
ob.setRotationCenter(focus);
// Set the transform for the viewplatform using this transformation matrix
TransformGroup vpTG = univ.getViewingPlatform().getViewPlatformTransform();
vpTG.setTransform(initial);
}
-----Original Message-----
From: ZACZEK, MARIUSZ P. (MARIO) (JSC-DM) (NASA)
[mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 02, 2003 11:13 AM
To: [EMAIL PROTECTED]
Subject: [JAVA3D] ? OrbitBehavior and LookAt ?
If you use 'OrbitBehavior' is there a way to also use the 'lookAt' function
of
the viewing transform3d correctly? Does anyone have any example code?
I can use the OrbitBehavior but once I do a single rotation of my view and
then
try to use the lookAt function to set my view I don't get the proper result.
Please give me some suggestions.
Mario
Mariusz Zaczek
NASA - Johnson Space Center
Automated Vehicles and Orbit Analysis / DM35
Flight Design and Dynamics Division
Mission Operations Directorate
Bldg: 30A Room: 3040A
Disclaimer: "The opinions, observations and comments expressed in my email
are strictly my own and do not necessarily reflect those of
NASA."
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