Debugging collision problems

Here’s a quick list of things to check when your collisions are not doing what you want:

1. Make sure both actors have a collision mesh. Even default Epic assets don’t all have collisons configured on them
2. Make sure the collision modes are set to what you think they are (verify during gameplay by selecting actors and checking the values)
3. Make sure the collision modes are not falling back on a more permissive mode
4. Ensure you haven’t manually ignored either of the actors, for example via Actor->MoveIgnoreActorAdd or IgnoreActorWhenMoving
5. If the actor isn’t colliding with anything whatsoever, check that you haven’t disabled collisions via SetActorEnableCollision which is separate from using a PrimitiveComponent’s SetCollisionEnabled