Thanks, Lily! That's the first clear explanation I've seen for quats. Do you
happen to know what the paramters are when creating a plane for the planes
array in BoundingPolytope( Vector4d planes )?
-Raffi
-----Original Message-----
From: Lily Lee [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 16, 2000 7:12 PM
To: [EMAIL PROTECTED]
Subject: Re: [JAVA3D] Quat4f
the quaternion is defined as follows:
think of a rotation about an arbitrary axis N, where
N = (x, y, z),
at an angle a. then the AxisAngle representation of the rotation is
(a, N). The same rotation is represented by the quaterion
Q = (s, V),
where
s = cos(1/2 a),
and
V = N sin(1/2 a)
Lily Lee
>
> See the Java 3D API Documentation,
> " Quat4f
> public Quat4f(float x, float y, float z, float w)
> Constructs and initializes a Quat4f from the specified xyzw coordinates.
> Parameters:
> x - the x coordinate
> y - the y coordinate
> z - the z coordinate
> w - the w scalar component "
>
> If it can help you.
>
> Armel
>
>
>
----------------------------------------------------------------------------
> -
> ----- Message d'origine -----
> De : "pine" <[EMAIL PROTECTED]>
> � : <[EMAIL PROTECTED]>
> Envoy� : vendredi 3 mars 2000 11:17
> Objet : [JAVA3D] Quat4f
>
>
> > t = new Transform3D();
> > t.setRotation(new Quat4f(0.78f, 0.78f, 0.78f,0.0f));
> >
> > What's the four parameters in Quat4f( ) mean?
> >
> > Thank you!
> >
> >
>
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>
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