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return Mathf.Sqrt(2 * jumpHeight * gravity);
return Mathf.Sqrt(2 * jumpHeight * gravity);

Revision as of 20:52, 10 January 2012


This is a rigidbody based first person controller. Traditionally first person controllers are done using the character controller and this is the recommended way, but sometimes you want it to use real physics. So forces automatically affect the rigidbody, and joints can be used to eg. make a rope swinging game.

The script works by adding a force in the direction of desired movement, it subtracts the current velocity from it, thus when letting go of all keys the character will stop. A maximum velocity change can be specified which will make the character come to reset slower faster and in effect apply more or less force to object the character runs into.


You can download a sample project with the complete setup here:


JavaScript - RigidbodyFPSController.js

var speed = 10.0;
var gravity = 10.0;
var maxVelocityChange = 10.0;
var canJump = true;
var jumpHeight = 2.0;
private var grounded = false;
@script RequireComponent(Rigidbody, CapsuleCollider)
function Awake ()
	rigidbody.freezeRotation = true;
	rigidbody.useGravity = false;
function FixedUpdate ()
	if (grounded)
		// Calculate how fast we should be moving
		var targetVelocity = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
		targetVelocity = transform.TransformDirection(targetVelocity);
		targetVelocity *= speed;
		// Apply a force that attempts to reach our target velocity
		var velocity = rigidbody.velocity;
		var velocityChange = (targetVelocity - velocity);
		velocityChange.x = Mathf.Clamp(velocityChange.x, -maxVelocityChange, maxVelocityChange);
		velocityChange.z = Mathf.Clamp(velocityChange.z, -maxVelocityChange, maxVelocityChange);
		velocityChange.y = 0;
		rigidbody.AddForce(velocityChange, ForceMode.VelocityChange);
		// Jump
		if (canJump && Input.GetButton("Jump"))
			rigidbody.velocity = Vector3(velocity.x, CalculateJumpVerticalSpeed(), velocity.z);
	// We apply gravity manually for more tuning control
	rigidbody.AddForce(Vector3 (0, -gravity * rigidbody.mass, 0));
	grounded = false;
function OnCollisionStay ()
	grounded = true;	
function CalculateJumpVerticalSpeed ()
	// From the jump height and gravity we deduce the upwards speed 
	// for the character to reach at the apex.
	return Mathf.Sqrt(2 * jumpHeight * gravity);
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