[Papervision3D] Camera Orbit in an ellipse?

[Kevin Burke]

Okay, so I've narrowed my hunt down to modifying the code in the orbit
function so it moves in an elliptical path rather than a circle. I know
nothing about physics (but am happy to learn). I believe the yaw is what I'd
like to change...I tried multiplying it by .5 but the camera's circular
behavior did not change. I think the distance variable needs to relate to
the yaw? Can anyone confirm? Thank you!

http://papervision3d.758870.n4.nabble.com/file/n2995578/ellipse.jpg 
        public override function orbit(pitch:Number, yaw:Number,
useDegrees:Boolean=true, target:DisplayObject3D=null):void
        {
            target = target || _target;
            target = target || DisplayObject3D.ZERO;

            if(useDegrees)
            {
                pitch *= (Math.PI/180);
                yaw *= (Math.PI/180);
            }
            
            // Number3D.sub
            var dx    :Number = target.world.n14 - this.x;
            var dy    :Number = target.world.n24 - this.y;
            var dz    :Number = target.world.n34 - this.z;
            
            // Number3D.modulo
            var distance    :Number = Math.sqrt(dx*dx+dy*dy+dz*dz);

            // Rotations
            var rx :Number = Math.cos(yaw) * Math.sin(pitch);
            var rz :Number = Math.sin(yaw) * Math.sin(pitch);
            var ry :Number = Math.cos(pitch);
            
            // Move to specified location
            this.x = target.world.n14 + (rx * distance);
            this.y = target.world.n24 + (ry * distance);
            this.z = target.world.n34 + (rz * distance);
            
            this.lookAt(target);
        }
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