I'm trying to migrate from 3Ds Max to Blender and everything was good until the moment I started to learn baking process. I have a 6 faces cube as low poly and its subdivided copy as high poly. Using ray distance or cage gives no difference. What am I doing wrong?
If you have just started blender the struggle is real hahaha. Jokes aside probably your ray distance is really big. Try from .010 too .100 See if it works.
Also remember that both high and lowpoly meshes need to be in the exact space. And remember you need to check the selected active check box. and select first the highpoly, and then the lowpoly. then pressed bake, but i assume you already know that.
Oh, well. If anyone else buried in this situation then be aware it's a Blender 2.8 Beta bug that is still not resolved (just googled). So the question may be closed.
It might not give you the solution to your issue, but I recommend you the TextTools addon. It simplifies the baking process a lot, on top of giving a simple and more intuitive an more appealing UI and workflow.
Maybe you already know that addon, as it was a 3DS Max addon first.
And, who knows, maybe the defaults settings of the addon will indirectly solve your issue...