How can I check if a player can visually see another?

For te record, I have no clue how to make plugins and cannot use java properly.

However, I suggest looking at the coding for zombies/other hostile mobs and see what Mojang used for their A.I.

not sure if you got what you wanted yet or not.

 

This might help you?
http://forums.bukkit.org/threads/found-a-cool-thing.84907/

 

Nope, because of two reasons:
1. The player might not be right under the crosshair but still be inside the FoV
2. The player might be behind another player but still be in the FoV
In both cases, the code you linked, would fail.

 

I really wish the new method hasLineOfSight(Entity e) did what I thought it did with regards to what this thread was discussing. Rather, it checks if the Entities' "lines of sight" are obstructed by a block.