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How to "invert" a PlaneSensor to make it useful:
To rotate a drag sensor, we must introduce a transformation to hold the rotation. If this transformation is placed directly over the drag sensor, then the surface-area geometry will no longer be a sibling, and the drag sensor will become useless. To work around this shortcoming, create a transform over the geometry. Then rotate the drag sensor's parent transform (which will also rotate the geometry), and then counter-rotate the geometry's parent transformation.
Transform { children [ PlaneSensor{} Transform { children [ Shape { geometry Box {} } ] ] }