What kind of settings could I use to render something like this ?
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I’m guessing you’re looking for a way to make shadow catcher. It’s very similar to other programs. In blender you need to make a special material to catch the shadow, in this case make your plane white, then click on your box and go to the materials pannel and check under Render Pipeline>only cast, to make it only cast shadow. Then that image can be used for your shadow alpha.
Omy! … Thats going to be a ALOT of of mesh merging 
Well one down ten to go !
Ok now how about this ?
