When destroying objects/mining resources with your Pickaxe (harvesting tool), a blue circle appears. That blue circle is a sort of bullseye to that object's sweet spot. Aim at that blue circle to destroy the object faster.
More specifically, the Pickaxe does 50 damage to structures, but if hitting the blue circle it does 100 damage so you will destroy the object twice as fast.
Against player-made structures, the Pickaxe does 25 damage when hitting normally or 50 damage when hitting the blue circle.
- There is no such critical spot when hitting other players with your pickaxe. It always does 10 damage (there is also no increased headshot damage)