Dear Ben,
> The problem I'm having is that I want the OrbitBehaviour to
> rotate around the Y-axis of the scene but instead it is rotating
> around the Y-Axis of the ViewPlatform. Because the ViewPlatform
> is pointing down towards the origin, it ends up rotating through
> the floor of the scene, rather than rotating around it in a flat
> plane.
This is what I've called 'drunken' behavior before (more than once)
and I suggested an additional flag to the constructor to achieve
the upright rotation ... without any response.
What you can do is: copy the code of OrbitBehavior to your own
package and change just one line inside integrateTransforms()
(marked with <--- / <===, // comments by me):
longditudeTransform.rotY( longditude );
latitudeTransform.rotX( latitude );
rotateTransform.mul(rotateTransform, latitudeTransform);
// original code as found in OrbitBehaviour J3D 1.3beta2
// rotateTransform.mul(rotateTransform, longditudeTransform); //<-----
// changed code to maintain an 'upright' behaviour, meaning:
// the horizon will be kept horizontal or stated another way:
// the 3D world Y axis ever is projected to a vertical line in 2D.
// Note, that the Y axis projection actually may appear upside down,
// but ever being vertical, avoiding the 'drunken behavior' of the
// original OrbitBehaviour.
//
// One improvement would be to restrict the Y axis turn, so that the world
// can't be viewed upside down.
rotateTransform.mul(longditudeTransform, rotateTransform); //<=====
distanceVector.z = distanceFromCenter - startDistanceFromCenter;
It's a pitty, but you can't just subclass OrbitBehavior, too many
members you need are private.
Hope this helps
Georg
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