Once all the variations have been set up in the variation manager, setting a variation to all your agents can be quite a tedious task.
A tool for quickly setting up your agents is the Variation Randomizer.
Select your agent group nodes from the scene.
Select some variations or the parent agent type, then press the arrow button to move the variations to the right list.
You can adjust the sliders to randomize the variation distribution.
Activate the "On selected agents only" if you wish to run the Randomizer only on the selected agents.
Once you are happy with your selection, click on the "Run" button.
