Material Color Surface - Daylight Factor

hello, i want to asked about this input. i want to applied a color on the surface. I want to know is the color only applied in one face/ two faces of the surface (front and back)??? and if its only apply in one face, how do i know which face have a color? thanks!

Most of Radiance materials will be applied to both sides. Some materials like mirror are an exception and will be applied to the front side of the face. You can find the front side by visualizing the normal of the face.

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okay! thank you :smiley: