hello Wayne,
I have not checked out your code yet, but maybe you should take a look
at Transform3D.lookAt(..).
Marco.
"wayne c deprince jr." wrote:
>
> ciao all,
> just need some help with a simple problem.. i want to set the
> direction (or orientation i guess) of an object (box, camera, whatever)
> from a direction vector.. i thought i could get it done but i havent
> been able to... i can do it if i know the angles already, but figuring
> the angles im messing up somewhere.. ive attached the code im trying..
> i know its not efficient but i just want to get it working.. thanks in
> advance, wayne
>
> /**
> * Updates the Tranform3D in the TransformGroup according to the
> * position, direction, normal. The transform is updated in place.
> * !NOT IMPLEMENTED!
> *
> * @param t the Transform3D to update.
> * @param p The new position.
> * @param d The new direction.
> * @param n The new normal.
> */
> private void _updateTransform(Transform3D t, Point3d p, Vector3f d,
> Vector3f n)
> {
>
> // First apply the position changes.
> t.setTranslation(new Vector3d((Tuple3d)p));
>
> // Now set the direction which this should be pointing.
> // We will do the rotations here.
> // Normalize the direction first.
> //d.normalize();
> Vector3f x = new Vector3f(1.0f, 0.0f, 0.0f);
> Vector3f y = new Vector3f(0.0f, 1.0f, 0.0f);
> Vector3f z = new Vector3f(0.0f, 0.0f, 1.0f);
>
> System.err.println("dir = " + d);
>
> Matrix3d rot = new Matrix3d();
> rot.setIdentity();
>
> Matrix3d x_rot = new Matrix3d();
> Vector3f temp = new Vector3f();
> x_rot.setIdentity();
> temp.set(0.0f, d.y, d.z);
> x_rot.rotX(z.angle(temp));
> System.err.println("x angle = " + z.angle(temp));
>
> Matrix3d y_rot = new Matrix3d();
> y_rot.setIdentity();
> temp.set(d.x, 0.0f, d.z);
> y_rot.rotZ(x.angle(temp));
> System.err.println("y angle = " + x.angle(temp));
>
> Matrix3d z_rot = new Matrix3d();
> z_rot.setIdentity();
> temp.set(d.x, d.y, 0.0f);
> z_rot.rotZ(y.angle(d));
> System.err.println("z angle = " + y.angle(temp));
>
> rot.mul(x_rot);
> rot.mul(y_rot);
> rot.mul(z_rot);
> //rot.rotZ(1.57);
>
> // Now set the rotation of this transform.
> t.setRotation(rot);
> }
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