29 minutes ago, ryt said:But that was not kinda my original question. I wanted to know how could I tell by merely looking at the system or if you create one how do you choose.
look from vector z end to pivot point. if turn from vector x to vetor y counterclockwice it is laft-hand if clockwice it is right hand. DX and GL using right-hand system. Math and CADs usually using a left-hand system.
To make a LH matrices you have just to inverse one of vectors. Usually it is y. So just reflect matrices/vectors respectively to one of planes to change a system orientation.