RigidbodyFPSWalker

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Revision as of 04:33, 21 October 2006 by Casemon (Talk | contribs)

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Description

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.

Usage

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

RigidbodyFPS.zip

JavaScript - RigidbodyFPSController.js

<javascript> var walkSpeed = 8.0; var walkBackwardSpeed = 4.0; var gravity = 10.0; var maxVelocityChange = 10.0; var inAirControl = 0.1; var canJump = true; var jumpHeight = 2.0;


// added for run (must set "Run" input to something in Project Settings / Input e.g. left shift)

var canRun = false; var runSpeedChange = 4.0; // negative values here makes game unhappy

// added for keyboard rotation ('Horizontal' rotates instead of translates / strafe) var canRotate = false; var rotateSpeed = 1.0; var rotateInAir = false;

private var grounded = false; private var groundVelocity : Vector3; private var capsule : CapsuleCollider;

@script RequireComponent(Rigidbody, CapsuleCollider)

function Awake () {

  rigidbody.freezeRotation = true;
  rigidbody.useGravity = false;
  capsule = GetComponent(CapsuleCollider);

}

function FixedUpdate () { if (grounded) {

// Calculate how fast we should rotate

var rotation = Input.GetAxis("Horizontal") * rotateSpeed;

// Set 'Horizontal' input based on rotate variable

var targetVelocity = (canRotate) ? new Vector3(0, rotation, Input.GetAxis("Vertical")) : new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical")); // targetVelocity = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));

// Calculate how fast we should be moving

targetVelocity = transform.TransformDirection(targetVelocity); if (Input.GetAxis("Vertical") > 0) { targetVelocity *= (canRun && Input.GetButton("Run")) ? walkSpeed + runSpeedChange : walkSpeed; } else { targetVelocity *= (canRun && Input.GetButton("Run")) ? walkBackwardSpeed + runSpeedChange : walkBackwardSpeed; }

// Rotate if rotate is enabled

if (canRotate) { transform.Rotate(0, rotation, 0); }

// Apply a force that attempts to reach our target velocity var velocity = rigidbody.velocity; var velocityChange = (targetVelocity - velocity) + groundVelocity; 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); }

grounded = false; } else { // Add in air


// Calculate how fast we should rotate

rotation = Input.GetAxis("Horizontal") * rotateSpeed; /* // Set 'Horizontal' input behavior based on whether we can rotate in air

targetVelocity = (rotateInAir) ? new Vector3(0, rotation, Input.GetAxis("Vertical")) : new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical")); */ targetVelocity = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));

targetVelocity = transform.TransformDirection(targetVelocity) * inAirControl;


// Rotate if rotate in air is enabled.

if (rotateInAir) { transform.Rotate(0, rotation, 0); }

rigidbody.AddForce(targetVelocity, ForceMode.VelocityChange); }

// We apply gravity manually for more tuning control rigidbody.AddForce(Vector3 (0, -gravity * rigidbody.mass, 0)); }

function TrackGrounded (col : Collision) {

  var minimumHeight = capsule.bounds.min.y + capsule.radius;
  for (var c : ContactPoint in col.contacts) 
  {
     if (c.point.y < minimumHeight) 
     {
        //we track velocity for rigidbodies we're standing on
        if (col.rigidbody) groundVelocity = col.rigidbody.velocity;
        //and become children of non-rigidbody colliders
        else transform.parent = col.transform;
        grounded = true;
     }
  }   

}

//unparent if we are no longer standing on our parent function OnCollisionExit (col : Collision) {

  if (col.transform == transform.parent) transform.parent = null;

}

function OnCollisionStay (col : Collision) {

  TrackGrounded (col);

}

function OnCollisionEnter (col : Collision) {

  TrackGrounded (col);

}


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);

} </javascript>

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