Hi Luigi,
Rotation Interpolator rotates about the local Y axis.
When you do:
AxisAngle4f faxisOfRot = new
AxisAngle4f(1.0f,0.0f,0.0f,(float)Math.PI/-2.0f);
Transform3D eje = new Transform3D();
eje.set(faxisOfRot);
You are transforming the local Y axis, exactly it makes a -90� rotation about
the X axis, then the local Y axis corresponds with the Z axis.
If the angle is 0 the Y axis remains unchanged, you'll see a rotation about the
Y axis.
I hope this helps,
Dani.
> 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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