FPSController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// Generic First-Person-Shooter-like Controller 
[RequireComponent(typeof(CharacterController))]
public class FPSController : MonoBehaviour
{
    [Tooltip("How fast the player moves when walking (default move speed).")]
    [SerializeField]
    private float movementWalkSpeed = 6.0f;
 
    [Tooltip("How fast the player moves when running.")]
    [SerializeField]
    private float movementRunSpeed = 11.0f;
 
    [Tooltip("If true, diagonal speed (when strafing + moving forward or back) can't exceed normal move speed; otherwise it's about 1.4 times faster.")]
    [SerializeField]
    public bool movementLimitDiagonalSpeed = true;
 
    [Tooltip("If checked, the run key toggles between running and walking. Otherwise player runs if the key is held down.")]
    [SerializeField]
    private bool movementToggleRun = false;
 
    [Tooltip("How high the player jumps when hitting the jump button.")]
    [SerializeField]
    private float movementJumpSpeed = 8.0f;
 
    [Tooltip("How fast the player falls when not standing on anything.")]
    [SerializeField]
    private float movementGravity = 20.0f;
 
    [Tooltip("Units that player can fall before a falling function is run. To disable, type \"infinity\" in the inspector.")]
    [SerializeField]
    private float movementFallingThreshold = 10.0f;
 
    [Tooltip("If the player ends up on a slope which is at least the Slope Limit as set on the character controller, then he will slide down.")]
    [SerializeField]
    private bool movementSlideWhenOverSlopeLimit = false;
 
    [Tooltip("If checked and the player is on an object tagged \"Slide\", he will slide down it regardless of the slope limit.")]
    [SerializeField]
    private bool movementSlideOnTaggedObjects = false;
 
    [Tooltip("How fast the player slides when on slopes as defined above.")]
    [SerializeField]
    private float movementSlideSpeed = 12.0f;
 
    [Tooltip("If checked, then the player can change direction while in the air.")]
    [SerializeField]
    private bool movementAirControl = false;
 
    [Tooltip("Small amounts of this results in bumping when walking down slopes, but large amounts results in falling too fast.")]
    [SerializeField]
    private float movementAntiBumpFactor = .75f;
 
    [Tooltip("Player must be grounded for at least this many physics frames before being able to jump again; set to 0 to allow bunny hopping.")]
    [SerializeField]
    private int movementAntiBunnyHopFactor = 1;
 
    private Vector3 movementMoveDirection = Vector3.zero;
    private bool movementGrounded = false;
    private CharacterController movementController;
    private Transform movementTransform;
    private float movementSpeed;
    private RaycastHit movementHit;
    private float movementFallStartLevel;
    private bool movementFalling;
    private float movementSlideLimit;
    private float movementRayDistance;
    private Vector3 movementContactPoint;
    private bool movementPlayerControl = false;
    private int movementJumpTimer;
 
 
    private void Start()
    {
        // Saving component references to improve performance.
        movementTransform = GetComponent<Transform>();
        movementController = GetComponent<CharacterController>();
 
        // Setting initial values.
        movementSpeed = movementWalkSpeed;
        movementRayDistance = movementController.height * .5f + movementController.radius;
        movementSlideLimit = movementController.slopeLimit - .1f;
        movementJumpTimer = movementAntiBunnyHopFactor;
    }
 
 
    private void Update()
    {
        // If the run button is set to toggle, then switch between walk/run speed. (We use Update for this...
        // FixedUpdate is a poor place to use GetButtonDown, since it doesn't necessarily run every frame and can miss the event)
        if (movementToggleRun && movementGrounded && Input.GetButtonDown("Run"))
        {
            movementSpeed = (movementSpeed == movementWalkSpeed ? movementRunSpeed : movementWalkSpeed);
        }
    }
 
 
    private void FixedUpdate()
    {
        float inputX = Input.GetAxis("Horizontal");
        float inputY = Input.GetAxis("Vertical");
 
        // If both horizontal and vertical are used simultaneously, limit speed (if allowed), so the total doesn't exceed normal move speed
        float inputModifyFactor = (inputX != 0.0f && inputY != 0.0f && movementLimitDiagonalSpeed) ? .7071f : 1.0f;
 
        if (movementGrounded)
        {
            bool sliding = false;
            // See if surface immediately below should be slid down. We use this normally rather than a ControllerColliderHit point,
            // because that interferes with step climbing amongst other annoyances
            if (Physics.Raycast(movementTransform.position, -Vector3.up, out movementHit, movementRayDistance))
            {
                if (Vector3.Angle(movementHit.normal, Vector3.up) > movementSlideLimit)
                {
                    sliding = true;
                }
            }
            // However, just raycasting straight down from the center can fail when on steep slopes
            // So if the above raycast didn't catch anything, raycast down from the stored ControllerColliderHit point instead
            else
            {
                Physics.Raycast(movementContactPoint + Vector3.up, -Vector3.up, out movementHit);
                if (Vector3.Angle(movementHit.normal, Vector3.up) > movementSlideLimit)
                {
                    sliding = true;
                }
            }
 
            // If we were falling, and we fell a vertical distance greater than the threshold, run a falling damage routine
            if (movementFalling)
            {
                movementFalling = false;
                if (movementTransform.position.y < movementFallStartLevel - movementFallingThreshold)
                {
                    OnFell(movementFallStartLevel - movementTransform.position.y);
                }
            }
 
            // If running isn't on a toggle, then use the appropriate speed depending on whether the run button is down
            if (!movementToggleRun)
            {
                movementSpeed = Input.GetKey(KeyCode.LeftShift) ? movementRunSpeed : movementWalkSpeed;
            }
 
            // If sliding (and it's allowed), or if we're on an object tagged "Slide", get a vector pointing down the slope we're on
            if ((sliding && movementSlideWhenOverSlopeLimit) || (movementSlideOnTaggedObjects && movementHit.collider.tag == "Slide"))
            {
                Vector3 hitNormal = movementHit.normal;
                movementMoveDirection = new Vector3(hitNormal.x, -hitNormal.y, hitNormal.z);
                Vector3.OrthoNormalize(ref hitNormal, ref movementMoveDirection);
                movementMoveDirection *= movementSlideSpeed;
                movementPlayerControl = false;
            }
            // Otherwise recalculate moveDirection directly from axes, adding a bit of -y to avoid bumping down inclines
            else
            {
                movementMoveDirection = new Vector3(inputX * inputModifyFactor, -movementAntiBumpFactor, inputY * inputModifyFactor);
                movementMoveDirection = movementTransform.TransformDirection(movementMoveDirection) * movementSpeed;
                movementPlayerControl = true;
            }
 
            // Jump! But only if the jump button has been released and player has been grounded for a given number of frames
            if (!Input.GetButton("Jump"))
            {
                movementJumpTimer++;
            }
            else if (movementJumpTimer >= movementAntiBunnyHopFactor)
            {
                movementMoveDirection.y = movementJumpSpeed;
                movementJumpTimer = 0;
            }
        }
        else
        {
            // If we stepped over a cliff or something, set the height at which we started falling
            if (!movementFalling)
            {
                movementFalling = true;
                movementFallStartLevel = movementTransform.position.y;
            }
 
            // If air control is allowed, check movement but don't touch the y component
            if (movementAirControl && movementPlayerControl)
            {
                movementMoveDirection.x = inputX * movementSpeed * inputModifyFactor;
                movementMoveDirection.z = inputY * movementSpeed * inputModifyFactor;
                movementMoveDirection = movementTransform.TransformDirection(movementMoveDirection);
            }
        }
 
        // Apply gravity
        movementMoveDirection.y -= movementGravity * Time.deltaTime;
 
        // Move the controller, and set grounded true or false depending on whether we're standing on something
        movementGrounded = (movementController.Move(movementMoveDirection * Time.deltaTime) & CollisionFlags.Below) != 0;
    }
 
 
    // Store point that we're in contact with for use in FixedUpdate if needed
    private void OnControllerColliderHit(ControllerColliderHit hit)
    {
        movementContactPoint = hit.point;
    }
 
 
    // This is the place to apply things like fall damage. You can give the player hitpoints and remove some
    // of them based on the distance fallen, play sound effects, etc.
    private void OnFell(float fallDistance)
    {
        print("Ouch! Fell " + fallDistance + " units!");
    }
}