Thank you very much Ken and Tina, now i understand it.
Ken Causey wrote:
> Please note that the documentation for that version of the
> RotationInterpolator constructor states:
>
> axisOfRotation - the transform that defines the local coordinate system
> in which this interpolator operates. The rotation is done about the
> Y-axis of this local coordinate system.
>
> To clarify, the transform you specify here is used as a coordinate
> system transform. By default the RotationInterpolator rotates about
> the Y axis of the local coordinate system of the object. Your transform
> maps the local Y axis onto the local Z axis (rotate about the X Axis
> -Pi/2 radians, actually this makes the rotation operate about the Z axis
> in reverse).
>
> Ken Causey
> ineffable
>
> At 06:48 PM 6/7/00 +0200, you wrote:
> >Hello all. I have a problem with AxisAngle4f class, i don't understand
> >how to use it very well, i can make it work as i want but i don't know
> >why it works in that way. I am using it to set the axis of rotation of a
> >RotationInterpolator. Here is my piece of code:
> >
> >
> >//--------------
> >
> > AxisAngle4f faxisOfRot = new
> >AxisAngle4f(1.0f,0.0f,0.0f,(float)Math.PI/-2.0f);
> > Transform3D eje = new Transform3D();
> > eje.set(faxisOfRot);
> >
> > Alpha rotationAlpha = new Alpha(-1, 4000);
> >
> > RotationInterpolator rotator =
> > new RotationInterpolator(rotationAlpha, objSpin, eje,
> > 0.0f, (float) Math.PI*2.0f);
> >
> >//------------------
> >
> >The scene is just a colorcube.
> >
> >With this axis my cube is CW rotating arround the z-axis... Why??
> >if I set the angle to "(float)Math.PI/2.0f" the cube rotates arround the
> >same angle but in CCW.
> >and if the angle is 0.0f then the rotation is arround y-axis.
> >
> >I don't understand how it is working, i can do what i want, for example
> >a rotation arround x-axis just trying changing the angle value to find
> >out what i want, but i would like to know how it really works. I think
> >that you can set an axis just with one vector, What is the angle
> >argument for? maybe is a basic geometry question, i don't know, but i
> >will be very glad if someone could explain it to me.
> >
> >Thanks in advance. This is very important for me.
> >
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> >
>
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