Re: [JAVA3D] Why does translation affect rotation values

[Florin Herinean]

Actually I've tested your code and the culprit is setScale, not
set(<translation>). That's normal, since what you retrieve is the combined
rotation-scale matrix from the transform3d.

Cheers,

Florin

-----Original Message-----
From: Discussion list for Java 3D API
[mailto:[EMAIL PROTECTED] Behalf Of Nikolai V. Chr.
Sent: Mittwoch, 28. April 2004 16:13
To: [EMAIL PROTECTED]
Subject: [JAVA3D] Why does translation affect rotation values


Thy the code below. You will see that setting a translation makes the
rotation values wrong. Translation values are not even present in a
Matrix3d, so how can this be??

Try comment the "t.set(new Vector3d(10,0,10));" line out, and observe
the different result.

import javax.media.j3d.*;
import javax.vecmath.*;

public class RotationTest {

 public RotationTest() {
 }

 public static void main(String[] args) {
  Transform3D t= new Transform3D();
  Matrix3d rotationScale = new Matrix3d();
  AxisAngle4d rotation = new AxisAngle4d(0, -1, 0, Math.PI/2);
  System.out.println(rotation);
  t.set(new Vector3d(10,0,10));
  t.setRotation(rotation);
  t.setScale(0.5d);
  t.getRotationScale(rotationScale);
  rotation.set(rotationScale);
  System.out.println(rotation);
 }
}

Test result:
(0.0, -1.0, 0.0, 1.5707963267948966)
(0.0, -1.0, 0.0, 2.0344438552856445)


Any workaround will be appreciated

Regards
Nikolai

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Nikolai V. Christensen, Computer Engineer,
Simulation and Training department
IFAD, Forskerparken 10A, DK-5230 Odense M
Denmark, EU
Phone: +45 63 15 71 31 Fax: +45 65 93 29 99
WWWeb: http://www.ifad.dk
e-mail: [EMAIL PROTECTED]
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