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Topic Some Questions about Source Code

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In Response to Zapper

I don't think you'll have to dig that deep into the engine to do whatever you want.
Most of the control stuff is in script nowadays.

Shoveling speed:
General speed: https://git.openclonk.org/openclonk.git/blob/HEAD:/planet/Objects.ocd/Clonk.ocd/Script.c#l867
The speed change during digging: https://git.openclonk.org/openclonk.git/blob/HEAD:/planet/Objects.ocd/Items.ocd/Tools.ocd/Shovel.ocd/Script.c#l131

Tree-cutting speed:
The speed is determined by how quickly the necessary damage is dealt to the tree. The damage is determined by Axe.ChopStrength, as outlined here:
https://git.openclonk.org/openclonk.git/blob/HEAD:/planet/Objects.ocd/Items.ocd/Tools.ocd/Axe.ocd/Script.c#l207

The bow stuff (or aiming in general) is handled by our aim manager library. The bow just tells the library how it wants to be treated here:
https://git.openclonk.org/openclonk.git/blob/HEAD:/planet/Objects.ocd/Items.ocd/Weapons.ocd/Bow.ocd/Script.c#l32