How to add diving/rolling to FPSWalker script? (Not animation, just speed)

Questions & Answers
1

I dunno why I can't figure this out, but its really frustrating me. I am trying to add a feature to the FPSWalker script so that if the player taps the spacebar key while moving, he will "dive" or "roll" in that direction, momentarily increasing his speed in that direction for a brief moment.

How would I go about doing this? I tried doing something similar to the stock jump code in the FPSWalker script, and tried starting a timer sort of like the bullet reset from the machine gun/ rocket launcher from the rocket launcher/machinegun script from the FPS tut, and applying the speed over that time, but I can't get it to do anything.

2

You could try doing it almost completely the same way as jumping by changing the axis on which you jump to the z axis, so that you jump forward. You could then increase the speed of the dive so that it is faster than the walking speed. You would also have to adjust the gravity so that you stopped after a few feet.

For Example:

var speed = 6.0;
var diveSpeed = 40.0;
var gravity = 20.0;

private var moveDirection = Vector3.zero;
private var grounded : boolean = false;

function FixedUpdate() {
    if (grounded) {
        // We are grounded, so recalculate movedirection directly from axes
        moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
        moveDirection = transform.TransformDirection(moveDirection);
        moveDirection *= speed;

        if (Input.GetButton ("Jump")) {
            moveDirection.z = diveSpeed;
        }
    }

    // Apply gravity
    moveDirection.y -= gravity * Time.deltaTime;

    // Move the controller
    var controller : CharacterController = GetComponent(CharacterController);
    var flags = controller.Move(moveDirection * Time.deltaTime);
    grounded = (flags & CollisionFlags.CollidedBelow) != 0;
}

This is the FPS Walker from the FPS Tutorial I think, except with the dive. Hope That helps.

3

Not sure if its poor form to answer your own question, but I think I figured this out.

I wanted to be able to dive in any direction, so I created a coroutine called DiveCheck(), that checks for a press of the jump button, and if pressed, changes walkSpeed to diveSpeed, waits for .1 second, and changes speed back to its original value (so its only a quick burst). Then I do another WaitForSeconds(0.5), so you can't spam the dive key.

Heres my code (i took out any vertical jumping code, because my game does not allow jumping):

var speed = 6.0;
var diveSpeed = 20.0;

private var moveDirection = Vector3.zero;

function Start(){
    DiveCheck();
}

function FixedUpdate() {

    //Calculate movedirection directly from axes
    moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
    moveDirection = transform.TransformDirection(moveDirection);
    moveDirection *= speed;

    // Move the controller
    var controller : CharacterController = GetComponent(CharacterController);
   controller.Move(moveDirection * Time.deltaTime);
}

function DiveCheck(){
    while(true){

        var initialSpeed = speed;

        if(Input.GetButtonUp("Jump")){
            speed = diveSpeed;
            yield WaitForSeconds(0.1);
            speed = initialSpeed;
            yield WaitForSeconds(0.5);
        }
        yield;  
    }
}