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I'm working on some skyscraper using a PBR, but I was wondering if there is a way to select the faces that contains the windows with the lights on, and put an emissive shader; or if there's a way to select a specific color (yellow) to select where the emission should be. enter image description here

Jack Fisherman
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I suppose that you're using an image texture, in that case you could mix it with an Emission in a Mix Shader, and also use it as the factor of this Mix Shader, so that all the bright parts of the image become emissive (you could also use the Emission inputs of the Principled BSDF but you can more easily control the Strength of the Emission with the following setup):

enter image description here

moonboots
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