O.K...
I have been looking all over for an addon that will help me tell when i need to back off an aggressive NPC target. my understanding about how agro works is a ring that extends so far around the NPC and when you enter it when not stealthed, your attacked. When in stealth the ring decreases and is only a certain angle of vision. if you enter that your discovered. i want to see something that warns me of where the area i can be found is, in both stealth and not.

The game doesn't normally pass location information for NPCs in a way that an addon can make use of, and doesn't pass information about which way they're facing. Thus, an addon wouldn't have the information it would take to draw a "stealth detection area".

Also, stealth doesn't work quite that way. Rather, there's a chance per unit time that an NPC notices you when you're in stealth, based on their level, your level, any special stealth detection abilities they have, any stealth-increasing talents you have, where you are in relation to their facing, whether you're moving, and probably some other things as well.

Thus, sometimes NPCs notice you sneaking up on them even when you're behind them... and sometimes, they'll walk right past you and not notice you.

(Aggro radius also varies based on your level vs. the NPCs, and an "aggressiveness" rating they have.)

Thanks for the help, now i know I'm not looking for something i cannot find. seriously tho, that did help me understand how stealth works.