See @xeokit/sdk/pick for usage.
Picks a kdtree3!SceneObjectsKdTree3 using a 2D marquee to obtain a MarqueePickResult containing picked SceneObjects, SceneMesh, SceneGeometry, scene!SceneGeometryBucket | GeometryBuckets, KdTrianglePrim, KdLinePrim and KdPointPrim.
TODO
See @xeokit/sdk/pick for usage.