hello.

I’m a beginner.

How i can calculate the direction vector if I have two point A and B?

I’m in a tree dimensional space with opengl then A={1,1,0} and B={2,2,1} for example.

Is sufficent do B - A ? or is different A - B?

The direction is a 3d vector?

Thanks.

To obtain a direction, calculate A-B, then normalise the result.

The sign(s) of the resultant direction vector is really telling you if your direction is A–>B or B–>A.

It depends if you go from A to B or from B to A

A to B is B-A

Depending on the case, direction vector must be normalized, but not sure it applies to your case.