The center and eye points specify the direction vector. The up vector
gives the final orientation of the viewer along the direction. So, it is
just a direction with some orientation information.
Doug Twilleager
Java 3D Team
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> Subject: [JAVA3D] Transform3D.lookAt() general question
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> Does anybody here knows how this funciton actually works? In General
> Documentation it is said:
>
> > lookAt
> >
> > public void lookAt(Point3d eye,
> > Point3d center,
> > Vector3d up)
> >
> > Helping function that specifies the position and orientation of a view
matrix.
> > Parameters:
> > eye - the location of the eye
> > center - a point in the virtual world where the eye is looking
> > up - an up vector specifying the frustum's up direction
>
> I wonder why we need "center" parameter, since it's sufficient to have
> only eye's position in the virtual world and vector pointing out the
> direction of the look. Moreover, in most cases (at least in my case) i
> don't actually know _the point_ the eye should look at, but rather
> direction only. Have i misunderstood something or what? I think the
> answer is as simple as a keyboard, but.... Please, if anybody knows the
> answer, help me.
>
> vladimir
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