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Greetings, I am learning to work with Radiance to evaluate the illuminance inside a room. After reading some examples I understood that the windows in the 3 Phase Method must be defined as a glow material and separate away (4-5cm) outside from the surface 'wall'. My question is: why the material must be a glow type and why the window is away from the wall? I tried with a glass material type and Radiance gave me a warning and the illuminance values are slightly different. Thank you in advance, Best regards

Greetings, I am learning to work with Radiance to evaluate the illuminance inside a room. After reading some examples I understood that the windows in the 3 Phase Method must be defined as a glow material and separate away (4-5cm) outside from the surface 'wall'. My question is: why the material must be a glow type and why the window is away from the wall? I tried with a glass material type and Radiance gave me a warning and the illuminance values are slightly different. Thank you in advance, Best regards