Question NavMesh.SamplePosition manual recommended maxDistance question (possible typo)

I have a question about the Unity NavMesh.SamplePosition manual.

"This function may reduce the frame rate if a large search radius is specified. To avoid frame rate issues, it is recommended that you specify a maxDistance of twice the agent height."

Can someone explain why it is recommended to use twice the height?
Or is that a typo and it should be twice the radius?

https://docs.unity3d.com/ScriptReference/AI.NavMesh.SamplePosition.html

 

same issue is there any other method can we use

 

Unfortunately not afaik.
Not sure why they use agent height as a reference, the agent radius would make a lot more sense imho.
It's a pity that there is no more intelligent way to generate a valid NavMesh position.