How to control the shadow?

hello, does someone know if it’s possible to control the shadows in Blender 2.8 like in this video ?
If so, how and where can you learn it ?

There’d be more that one way to do it. Here’s one, where I basically get a light map, then use vertex color to override it. (Don’t have to subtract green channel, that’s just my lazy way of starting with white VC instead of black; doing it by hue might make more sense):

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Hey, I tried to do it, but it’s like to just change the color of my object to get shadows. I want to control the shadows when the sun i shining or not. If you would rotate the object against the sun, the parts you painted red would be still light although the sun is not shining on it.