How would I detect if NPC is close to a huge model?

[Ty_Harukii]

You would probably be better off using a raycast.

Raycasting distance

Yup! You can do this easily with raycasting. First, create a ray with the origin position set as the parts position and the direction set downwards: local MaxDistance = 10 --Maximun distance the ray can go local Part = workspace.Part --Your part from where you want to raycast local R = Ray.new(Part.Position, Vector3.new(0,-1*MaxDistance,0)) -- First parameter is the origin and second is the direction. Since it is going downwards, the Y coordinate of the direction has to be negative local Part…