Knapping System

ExPetrum adds a knapping mechanic to obtain stone tool heads.
In order to use this mechanic the player must find a boulder in the world while having either rocks, flint or chisel and hammer.
Right-clicking a boulder with a rock or flint will have a chance to knap that boulder into a boulder with a tool shape.
Right-clicking the boulder with a chisel while having a hammer will instantly transform it into a boulder with a tool shape.
After that clicking that boulder with either rocks, flint or chisel will cycle the tool shape(a 12% chance with either rocks or flint, instantaneous with a chisel).
A rock has a 12% chance to break upon right-clicking, flint will only break when the tool shape changes and chisel will always take damage.
When the tool shape is satisfactory the boulder can be right-clicked with an empty hand to obtain the tool head.
The following shapes transfrom into following tool heads:

Hammer

Axe

Shovel

Spear

Knife

Chisel