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# Rotationinterpolator axis

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?

Tnx

• 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,

newAxis.rotZ(Math.PI/2)

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.
• the rotation is usually linked to a matrix of an object

Transform3D transform = new Transform3D();
transform.rotX((Math.PI/180.0d));
//this will rotate the X-axis by one degree

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

transform.get(m1);
//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.

transform.set(m4);
//You can then apply the new
//matrix to the transform and then to the object
//myExactOrientation is a matrix too (the original one)

objTrans.setTransform(transform);
//objTrans is linked to the object better said to the
//TransformGroup

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

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