ArmA 3 Terrain Processor
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ArmA 3 Terrain Processor, ArmA 3 Terrain Processor Support Forum
User Guide
Terrain Processor (TP) is a bitch, you make one slight wrong configuration and BANG it crashes or freezes without mercy :)
Project *.TPP files are XML text format, you can edit them but as bis TP manual states its not advised as its easy to make mistakes and again TP will crash, so be very very careful.
You should name every TPP project file with very descriptive file name (normal rules apply, no spaces, no stupid characters) so you can re-use them with other terrains in the future. See TPP Naming Rules for an example.
It is cumbersome to add object template names into the projects so once you do it, save the TPP file that you don't have to type in all those templates next time you want to place forests etc. Also inside <ObjectPrototypes>
you can use a proper text editor to copy-paste from area random into high density cluster.
Area: High-density Cluster, if you drop object probability to 2, it starts to really slow down the object creation.