How do I calculate when a character is within an angle?

[Everynone]

The linked thread seems to have everything you need, but here’s a more visual example - perhaps that helps:

How to create God of War targetting system?

The Dot Product of 2 directional vectors will be in range of -1 to 1. Anything that’s above 0 is in front of you, anything below 0 is behind (and every other value in between matters, too!) [dot.jpg] I grab all the actors around the player using a Sphere Overlap (as in the original suggestion) and loop through the elements of the array, checking my angles - Dot player’s forward and the direction to each target. For dot values greater than .5 I mark the target, and add that actor to the array…

Essentially, you want to use dot product and, optionally, convert it to angle. There are more examples linked under the above post.