Changes to ceilings will require some management of the lighting fixtures in your model. Facehosted lighting fixtures will maintain their association with the ceiling when there is a change in elevation, but you should also be concerned with any lateral movement, especially with grid ceilings.
Lateral movement can have different effects on your lighting fixtures depending on how the grid was placed into the model. Grids that are placed by automatically locating the boundaries of a room will not affect your light fixtures when they are moved laterally. This is true as long as the
movement does not cause your fixtures (which won’t move laterally with the ceiling) to be located outside the boundaries of the ceiling. If the architect deletes a ceiling and then replaces it, your fixtures will become orphaned when you get the updated architectural file, and they will remain
at the elevation of the original ceiling and will no longer respond to changes in the elevation of the new ceiling. You will have to use the Pick New tool to associate the fixtures with the new ceiling.
Ceilings that are placed into the model by sketching the shape of the ceiling will have a different effect on your fixtures when moved laterally. If the entire ceiling is moved, your light fixtures will remain in their location relative to the ceiling. If a boundary of the ceiling is edited by dragging it to a new location while in sketch mode, your fixtures will remain where they are
located; however, any attempts to place new fixtures into the ceiling will cause them to appear outside the host, and you will receive a warning indicating that the fixture has no host. You can use the Pick New tool then to place the fixture in the ceiling.
Because ceilings tend to move around quite a bit in the early stages of a design, you may want to consider hosting your lighting fixtures to a reference plane until the major changes have settled down. At that point, you could move your fixtures to the ceilings by using the Pick New tool
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