Thank you, the explanation and the video attached is really helpful. Finally get the idea of this direction. And the article for Vector math helps me a lot.
I see in your playground, you choose the normal of that box to be (0,0,1).
I did some reading online, most of it is talk about normal as a plane, but how about if I just know the position of the mesh as a dot and need to get the normal of that mesh? How can I get the perpendicular vector I need to do the calculation? Does babylon has some existing method we can use?
