What to do to make the face that is opposite the camera brighter?

I want to make a bjs scene perform as sketchup, a face will brighter when the face normal is closer to the camera look direction. Is there any parameter can control this?



https://www.babylonjs-playground.com/#0M0UAI#46

You should not use the emissive but the diffuse color instead and add some lights to your scene:
https://www.babylonjs-playground.com/#0M0UAI#73

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Yeah, In fact, in my project I have used diffuse color instead emissive color, and I want to add a directlight which follow camera in look direction and position, you know, just like put a flashlight on my head. but I don’t how to make the direction of directlight correspond with camera look direction.

Something like that - https://playground.babylonjs.com/#1OTIFL#4

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Thanks, that’s what I want.