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After version 2.5, we provided the Auto Collision Avoid tool which can make our agents avoid each other automatically without any setup.
The smallest radius
Before talking about the auto avoid, there is a very important concept need firstly clarify. It is the smallest radius.
Each agent has a radius range, if other agents in this range, the agent will push out other agents a little bit, and this range called "smallest radius". That's the closest distance the agent can bear other agents.
The smallest radius can be calculated by:
Agent Smallest Radius = Agent Sphere Radius * Smallest Radius Ratio
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