gracia marco, ill try this but isnt this for setting a view transform
only? i think i need a transformation/model transform.. maybe they are
the same? im not sure obviously... but ill give it a try... ciao, wayne
Marco Lohse wrote:
>
> 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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