This Q3-inspired first person controller is made with two goals in mind:

• Arcade feeling facilitates strafejumping / bunnyhopping, allowing easy-to-play-hard-to-master movement. It uses similar movement logic used in quake / halflife games to achieve oldschool feel.

• Avoid using CharacterController and make every step of the logic as transparent as possible.

• Unpack the package

• Add a layer "PlayerCollider" and set the player's collider to be on that layer

• Add that layer to FpsController.ExcludedLayers on the prefab. Collision and grounded checks will ignore these layers

Quake3-movement-unity

Quake3 source

Half Life 1 SDK source

Bunnyhopping from the Programmer's Perspective