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description field specifies a text string used to describe the viewpoint.
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Viewpoints are kept in a stack and the top of the stack is current viewpoint.
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Background, Fog, NavigationInfo also are done in this stack fashion
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When a jump (is TRUE) viewpoint is placed on top of the viewpoint stack, the viewer automatically jumps to that Viewpoint node's position, orientation, and field of view.
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When a no-jump viewpoint is placed on top of the viewpoint stack, by selecting it from a browser's menu for example, the user retains his or her current view.
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In any case, the viewer's movements are now relative to the new current viewpoint node and to the coordinate system in which that viewpoint is built.
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