Angle calculation not working??

Questions & Answers
1

I’ve been trying to calculate the angle between two Vec2’s, but for some reason the way i’ve learned to do it via trig isn’t working, and instead is giving me completely incorrect angles (in radians, and between 0 and 2π, which is kinda good at least because that’s the expected range, but the angle itself is seemingly placebo-random within that range). This is the method i’m using (please excuse the awful writing):

35954-trig.png
35954-trig.png800×600 28.9 KB

Anyone know why the heck this isn’t working? I’ve tried this with Atan and Atan2, but neither works :confused:

This is the code i’ve been using (the object starts at origin, removing the need for subtraction beforehand):

 float angle = Mathf.Atan(target_pos.y/target_pos.x);

Anyone know what i’m messing up? It’s giving me really crazy angles, like negatives when it’s in the 2nd quadrant -_-

2

“isn’t working” doesn’t give us much to go on when we can’t see your code, know what value you expected, or got. Please post a reproducible example. You are working with radians, right?

3

For most case, better use Mathf.Atan2:

 float angle = Mathf.Atan2(target_pos.y, target_pos.x); //return angle in radians

But, in your line can be devision by 0 (target_pos.x = 0). Of course, you have exception. In Atan2() in this case angle is equal 90 degree. I hope that it will help you.