I was playing terraria and i kept thinking… how some monsters behave!
For instance, the boss “Eye of cthulhu” and the small eyes which keep trying to follow you but are so DUMB* that they keep smashing into walls and bouncing.
Question : How did they code it? Its hard to imagine how they coded a “dumb” eye and that Chtulu movement.
Anyone have a light on this? Its just me or everyone have some difficulty on it
Starts at 8:00
PS : ITS NOT MY VIDEO
He’s not dumb, he just has a difficulty reversing the velocity so when he starts charging towards you it takes some time for him to come to a halt if he misses. 
Mike
But what about when the eyeballs bounces into a wall…
Like you are in one side of a wall, and its is in the other side and it keeps trying to pass through
Same thing but with collision detection.
That would be really easy in a way,
Just have no path finding for the mob. check for collision and it will bump out, and just set a negative velocity.
so it will never know if a wall is in front of it, but if it hits it, it will bounce back.
EDIT: fixed it up, wrote character instead of mob
So it just uses Euclidean Distance? Also it sometimes just stand still and shoot… but it doesnt seem to have a fixed Timer…