Difference between a Aperture with a single face again a closed brep on a DaylightSim

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Dear community,

I have a curiosity on how does Radiance work in Ladybug, when I want to run a daylight simulation, where a “Aperture” instead of being a single surface is a closed brep/element, as when I import an element from Revit?

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Is the same thing and does not impact the simulation result or does the closed element waste an extra ambient bounce?

Thanks and best regards

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To my knowledge, Radiance doesn’t except volumes. So a closed brep/element will be exploded into 6 separate surfaces, which will all be given the chosen property of the aperture. So if you’ve chosen an aperture with LT = 0,7, a ray will need to pass through both of large surfaces (the 2 windows panes), which will result in LTw = 0,7*0,7 = 0,49. So that’s a no go. You will need to remove the extra surfaces from the brep.

You can use my Rhino.Inside.Revit script as example of how to do this: GitHub - labrossemp/Rhino.Inside.Revit: Simple script to export geometry from Revit to Rhino

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