Grasshopper shadow area calculation

I want to calculate the area of shaded region of each surface of a building (or input geometry) individually. So far I haven’t been able to do it with components of Ladybug. Although other softwares can just display the shadow - I want to know the exact area on each wall for further calculations.
I have attached a sample file in which I want to know the area of the small triangular shaded region on the wall at a given sun angle.

Any suggestion?


Look at the reply from @HS_Kim here:

Thanks for replying.
I have already tried that component and it gives the shadow on the ground.
I want the shadow area on the objects itself, i.e. the area of shadow on each of the surfaces of the brep and not on XYPlane