When do I need to set the Obstruct light from Internal room surfaces check box in the Advanced Quality Settings dialogue box?
In the room for which the calculation is being carried out (the subject room), daylight only enters via windows and holes, whether or not the Obstruct light from Internal room surfaces check box is set. This is mainly for efficiency reasons, but effectively it means that the wall containing the window or hole is always treated as an obstructing surface for light entering via that window or hole. So, unless other rooms are to be included in the calculation, the only reason for setting this check box would be to take account of extra obstructing surfaces, e.g. in an L-shaped room.However, in other rooms, if they are included in the calculation, internal room surfaces are treated as obstructing surfaces only if the Obstruct light from Internal room surfaces check box is set.
So, if other rooms are included in the calculation, and there is a chance that light from internal surfaces of those rooms may contribute by inter-reflection to the subject room, this check box should be set.
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