I have looked online and found a lot of answers on how to make a solid tree with a box colider and how to make that a prefab, but the problem is even when I drag my solid tree prefab to the tree section on the terrain editor and place a few trees I can still walk through them? any ideas on why would help.
use a capsule collider, and make it a child off the tree then make the tree a prefab by dragging it into the project view. After this on your terrain you add the tree to the tree section, then you mass place or you can place individually. Tried it on mine just now and it worked.(Make sure on the terrain settings you have checked the box “Trees have Colliders”).
Hoped I helped.