| 摘要 |
In one embodiment, a method determines a first plane in a plurality of planes that is active for placing elements in a three dimensional (3D) space. A changing of a viewing direction of the first plane in the 3D space is detected. The method determines when a second plane in the plurality of planes should be activated for placing elements based on the changing of the viewing direction. The second plane is then activated for placing elements in the 3D space. The second plane is oriented at a different angle than the first plane with respect to the viewing direction.
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