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Rotationinterpolator axis

843799 Member Posts: 49,999
edited Aug 9, 2001 5:54PM in Java 3D
I've noticed, ALL of the tutorials use a rotation over the Y-axis.

So, since i'm new to java3d (not to java), i wonder how I could instantiate the rotationinterpolator to rotate over the other two axes, namely the X-axis and the Z-axis.

And is the Y-axis rotation a default value for rotationinterpolator?



  • 843799
    843799 Member Posts: 49,999
    I have noticed the same thing in the tutorials i have looked at, and I havent been able to find help anywhere. I do know that the y-axis the default axis of rotation. I think you have to do something like this:

    1. declare a new Transform3D object

    Tranform3D newAxis = new Transform3D();

    2. "rotate" this newAxis to the axis you want it to rotate around, using the rotX,rotY,rotZ --> for example,


    will rotate newAxis around the z-axis by 90 degrees

    3. when you call the RotationInterpolator constructor, pass newAxis into the parameter list

    I am not sure if this works, but you can give it a try. If you find the solution, please post it here.
  • 843799
    843799 Member Posts: 49,999
    the rotation is usually linked to a matrix of an object

    Transform3D transform = new Transform3D();
    //this will rotate the X-axis by one degree

    Matrix3f m1 = new Matrix3f();
    //this creates a new matrix

    //this extracts the roatated matrix from the transform

    Matrix3f m4 = new Matrix3f();
    m4.mul(myExactOrientation, m1);
    //if you want to apply the rotation to an existing matrix
    //of an object you have to multiply the two matrices
    //and then save it in a new matrix.

    //You can then apply the new
    //matrix to the transform and then to the object
    //myExactOrientation is a matrix too (the original one)

    //objTrans is linked to the object better said to the

    I hope this helped! if you have any further questions don't hesitate to contact me
    sincerely Till Brenner
    DaimlerChrysler, Germany
  • 843799
    843799 Member Posts: 49,999
    yep, tnx!

    It works now...
This discussion has been closed.