Rotation AXIS

Hi,
What's the diference, if one, of:
SomeNode {
rotationAxis : Point3D{
    x: 1
    y: 1
    z: 1
}and
SomeNode {
rotationAxis : Point3D{
    x: .5 //(or any value)
    y: .5 //(or any value)
    z: .1 //(or any value)
I'm try to understand but the only one diference is when using a negative value. If none differences, why using a Point3D? It sounds a little confuse...
Thanks.
Edited by: volnei on 28/Abr/2010 10:13

JavaFX isn't 3D yet, far from it (despite some interesting demos), but they made provision for the future, apparently.

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Can You Change 3D Object Rotation Axis?

Greetings. I have created a 3d object using repousse in Photoshop (CS5 extended). The original 2d image was created in Illustrator. I have found that in both Photoshop and After Effects, when I rotate this object in 3D space, either rotating the object itself or the camera, that the axis upon which it rotates is not the 3D center of the 3D object, but rather somewhere behind it. The result is that it is rotating like the moon rotates around the earth, rather than rotating in place, like an eye moving (rotating) in an eye socket; i want the eye ball to stay in one place, but see the pupil move up and down and all around like a real eye would.
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Not really true...
Yes it is limited but it can be altered.
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When I "Alt click" with the rotation tool, to specify a rotation angle and copy an object, Illustrator CS2 does not set a rotation point, it takes a long time for the dialog box to come on and it frizzes the program until it does. Because there's not a set rotation point, it rotates the copied object anywhere. The angle is not the
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function initialize(e:Event)
   //add a click listener to the stage
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function fire(m:Event)
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   //set the position and the rotation of the bullet
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   b.x = x;
   b.y = y;
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For some reason, the gun's bullets still come out from the registration point. The registration points are on the arms, the gun is facing right and the barrel is at the end of the right.
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Hello,
A question concerning PositionInterpolator:
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Well kiddies, it's getting late and my head hurts. I'm still trying to get the new Interpolator working...
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// Allows an object or group of objects to be moved around SMOOTHLY by the
// keyboard in the X x Z plane.
public class KeyboardControlBehavior extends Behavior {
// USER DEFINED VARIABLES (SET ONCE, REQUIRED TO SET THINGS UP)
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private long time = 0;
// The distance travelled in one move.
private float distance = 0.0f;
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private Vector3d rotationAxis = null;
// BEHAVIOR DEFINED VARIABLES (CONSTANTLY CHANGED TO KEEP MOVING FORWARD)
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private RotPosScalePathInterpolator posInt = null;
// The Alpha object used by the Interpolator.
private Alpha alpha = null;
// The Knots used by the Interpolator (Alpha time of each key frame).
private float[] knots = null;
// The Quaternions used by the Interpolator (rotation of TransformGroup at
// each key frame).
private Quat4f[] quats = null;
// The Scales used by the Interpolator (scale of TransformGroup at each
// key frame).
private float[] scales = null;
// The Positions used by the Interpolator (position of TransformGroup at
// each key frame).
private Point3f[] positions = null;
// Create the KeyboardControlBehavior.
KeyboardControlBehavior(long time, float distance, TransformGroup target){
super();
// Set the target TransformGroup to move around.
this.target = target;
// Set the time it takes to move the TransformGroup around.
this.time = time;
// Set the Alpha object to the specified time for the Interpolator to use.
this.alpha = new Alpha(1, time);
// Set the distance to move the TransformGroup around.
this.distance = distance;
// Set the rotation axis of the Interpolator to be the Y axis.
Transform3D yAxis = new Transform3D();
yAxis.rotZ(-Math.PI/2.0f);
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yAxis.get(this.rotationAxis);
// Set the Alpha time of each key frame:
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// - Rotation frame is at 0.3
// - Translation frame is at 1.0
this.knots = new float[3];
this.knots[0] = 0.0f;
this.knots[1] = 0.3f;
this.knots[2] = 1.0f;
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this.scales[0] = 1.0f;
this.scales[1] = 1.0f;
this.scales[2] = 1.0f;
// Initialize all the positions to be the current TransformGroup's
// position.
Transform3D curPos = new Transform3D();
target.getTransform(curPos);
Vector3f curPosVec = new Vector3f();
curPos.get(curPosVec);
float[] curPos3f = new float[3];
curPosVec.get(curPos3f);
this.positions = new Point3f[3];
this.positions[0] = new Point3f(curPos3f);
this.positions[1] = new Point3f(curPos3f);
this.positions[2] = new Point3f(curPos3f);
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this.quats[1] = this.createQuaternionFromAxisAndAngle(this.rotationAxis, 0.0f);
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this.posInt.setEnable(false);
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public void initialize(){
// Set the initial wakeup condition to a key pressed.
this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
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// pressed).
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// Extract the KeyEvent.
KeyEvent event = (KeyEvent) ((WakeupOnAWTEvent) criteria.nextElement()).getAWTEvent()[0];
// Read the key code that was pressed.
int currentKeyCode = event.getKeyCode();
// Execute the desired movement according to which arrow key was pressed
// as well as the previous arrow key (previous direction).
if(alpha.finished()) {
if(currentKeyCode == KeyEvent.VK_UP
|| currentKeyCode == KeyEvent.VK_DOWN
|| currentKeyCode == KeyEvent.VK_LEFT
|| currentKeyCode == KeyEvent.VK_RIGHT) {
// Set the position of the first key frame to the last key frame's
// position.
positions[0] = (Point3f)positions[2].clone();
// Set the rotation of the first key frame to the last key frame's
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quats[0] = (Quat4f)quats[2].clone();
switch(currentKeyCode) {
case KeyEvent.VK_UP:
System.out.println("UP KEY");
// If the current direction is different than the last direction,
// a rotation into the new direction is required.
switch(lastKeyCode) {
case KeyEvent.VK_DOWN:
break;
case KeyEvent.VK_LEFT:
break;
case KeyEvent.VK_RIGHT:
break;
case KeyEvent.VK_UP:
// If we're going in the same direction, do not rotate.
positions[1] = (Point3f)positions[0].clone();
quats[1] = (Quat4f)quats[0].clone();
break;
// Set the last key frame farther away on the Z axis.
positions[2].z += distance;
break;
case KeyEvent.VK_DOWN:
System.out.println("DOWN KEY");
break;
case KeyEvent.VK_LEFT:
System.out.println("LEFT KEY");
break;
case KeyEvent.VK_RIGHT:
System.out.println("RIGHT KEY");
// If the current direction is different than the last direction,
// a rotation into the new direction is required.
switch(lastKeyCode) {
case KeyEvent.VK_DOWN:
break;
case KeyEvent.VK_LEFT:
break;
case KeyEvent.VK_RIGHT:
// If we're going in the same direction, do not rotate.
positions[1] = (Point3f)positions[0].clone();
quats[1] = (Quat4f)quats[0].clone();
break;
case KeyEvent.VK_UP:
break;
// Set the last key frame farther away on the X axis.
positions[2].x += distance;
break;
// Enable the Interpolator.
posInt.setEnable(true);
// Activate the Interpolator to move the TransformGroup.
posInt.getAlpha().setStartTime(System.currentTimeMillis());
// Save the last key code.
lastKeyCode = currentKeyCode;
else {
System.out.println("NOT AN ARROW KEY");
// Don't move the TransformGroup.
else {
System.out.println("Waiting for animation to complete...");
// Wait till animation is finished to process next key.
// Consume the key pressed event.
event.consume();
// Reset the wakeup condition to await the next key pressed event.
this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
// A very practical method to convert Radian angles into Quaternions.
// (Taken from page 207 of Daniel Selman's Java 3D Programming book.)
private Quat4f createQuaternionFromAxisAndAngle( Vector3d axis, double angle ) {
double sin_a = Math.sin( angle / 2 );
double cos_a = Math.cos( angle / 2 );
// Use a Vector so we can call normalize.
Vector4f q = new Vector4f();
q.x = (float) (axis.x + sin_a);
q.y = (float) (axis.y + sin_a);
q.z = (float) (axis.z + sin_a);
q.w = (float) cos_a;
// It is best to normalize the Quaternion so that only rotation
// information is used.
q.normalize();
// Convert to a Quat4f and return.
return new Quat4f( q );
} // end of class KeyboardNavigationBehavior

Can anybody recommend me on the strain gauges which are attached along a steel bar, say, 3 mm in diameter, and can respond at a sampling rate of 100 kHz?

Or anybody has similar application, it would be very grateful if you can share your experience.

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I am greatly appreciated if you can further advise me on this. Thanks in advance.

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yaoyao3337 wrote:
Hi, I only have one graphic card, Intel Graphics Media Accelerator X3100, so the problem is because of my low power graphic card? Forgive me, please teach me how to plug two monitors?
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We can no know if your card is the cause until you try using a different card. With me, the same problem was solved by using only one radeon 4870 card with two monitors.
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Rotation AXIS

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