Angle of incident laser

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Hi everyone, I'm beginner in simulation with COMSOL software. I'm very curious in someone's 2015 article about deposited beam power on heat transfer in solid, they filled in 3 parameters about beam origin point, beam orientation but currently my COMSOL software can only change the z parameter of that. So can someone guide me in detail how to use this, because in the article I followed it used that equation?


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