I always struggle with intuitively figuring out the order of subtraction in multiple situations for example
The difference between the current mouse coordinates and the last frame's coordinates
The direction an object is to the camera position
I know that A - B = A + (-B) ..my problem is figuring out which one is A and which one is B ..and those were just simple examples
Is there any hard and fast rules for this? Or is it supposed to be intuitive and obvious (which is what I'm afraid of)?
I have similar problems with figuring out which order to take the cross-product of two vectors too, depending on the scenario