Genesis Device has interviewed Clint Hocking about the map editor in Far Cry 2
Genesis Device
He mentioned around 16 different collection systems will be available under each biome in the game. Some of the biomes include desert, savannah, jungle, etc. There are also collection systems for things like rocks but he didn't list any others.
It seems so that you won't be able to place any weapons in your map. Instead of that you can only use ammo-boxes.
Weapon placement has been removed from the game because of the class based system. You pick which weapons you start with and then can place ammo dumps around the map in which you can either reload you supply with or shoot and detonate while someone else is reloading.
You can read the whole interview on Genesis Device.
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