Leveling Rate for Heroes

What determines how much experience a hero gains? Is it the "point value" of the unit that is killed or is it the unit's level?

Oh, and does anybody know why if a tower kills a unit, a hero near it doesn't recieve experience?

Thanks!

First: it is not related to the point value. There's a calculation involving the level of the unit.

Second: it is so because Blizzard made it so at some point for melee-game purposes. Not sure if that's available to be overwritten, but if so, it'll be in Gameplay Constants.

ok yeah I found out where to make it so tower kills grant experience but I'm still not quite sure how to go about giving more experience to heroes for units. Is there a better method than just raising the target unit's level?

This is also to be changed in gameplay constants. Try the hero experience table.

The simplest thing to do is to change the XP required to level up, and you can do this simply by changing the Hero - Constant Factor, Hero - Level Factor, etc., but these first two are for more "dramatic changes", experiment with them

There is also a trigger action that modifies how much % of the default experience the heroes of a single player gain from kills. With this, you can also dynamically alter the speed a hero gains experience ingame.

Formula is:

Level times factor plus constant.

Gameplay constant contains hero, summons and normal units factor and constants, under hero xp gain rate.