There are element types that can gravitate to the surface of certain element types, e.g. Wall, Column, Beam, Object etc.
And there are element types that other elements can gravitate to. These are: Slab, Roof, Shell, Mesh.
These element types cannot gravitate to other element types. Only other element types can gravitate to them. This is why the Gravity button is grayed when these element types are active.
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