Stay on moving platforms

Question

Stay on moving platforms

I am writing a 2D Platformer in Unity, and I am trying to get the player to stay on a moving platform. Now I searched and fumbled for a day or two, and I was out of luck.

Basically, they told me to try to move the character off the platform when they touch each other. Firstly, if I use anything related to OnTriggerEnter (), the player goes straight through the platform. If I do OnCollisionEnter () (using CharacterController on the player and BoxCollider on the platform), nothing happens at all. These are the two things I have found the most. The other is to educate the player on the platform, but this, apparently, causes "problems" (often stated, never explained).

So, how can I make a player stay on a moving platform? Here is the code for the moving platform:

public class MovingPlatform : MonoBehaviour
{
private float useSpeed;
public float directionSpeed = 9.0f;
float origY;
public float distance = 10.0f;

// Use this for initialization
void Start () 
{
    origY = transform.position.y;
    useSpeed = -directionSpeed;
}

// Update is called once per frame
void Update ()
{
    if(origY - transform.position.y > distance)
    {
        useSpeed = directionSpeed; //flip direction
    }
    else if(origY - transform.position.y < -distance)
    {
        useSpeed = -directionSpeed; //flip direction
    }
    transform.Translate(0,useSpeed*Time.deltaTime,0);
}

And here is the code for the player’s movement (in the update):

CharacterController controller = GetComponent<CharacterController>();
    float rotation = Input.GetAxis("Horizontal");
    if(controller.isGrounded)
    {
        moveDirection.Set(rotation, 0, 0); //moveDirection = new Vector3(rotation, 0, 0);
        moveDirection = transform.TransformDirection(moveDirection);

        //running code
        if(Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift)) //check if shift is held
        { running = true; }
        else
        { running = false; }

        moveDirection *= running ? runningSpeed : walkingSpeed; //set speed

        //jump code
        if(Input.GetButtonDown("Jump"))
        {
            //moveDirection.y = jumpHeight;
            jump ();
        }
    }
    moveDirection.y -= gravity * Time.deltaTime;
    controller.Move(moveDirection * Time.deltaTime);

EDIT: I think this may be due to how I define the player and platform, but I tried different combinations. If the platform is a trigger (at the collider), the player passes sequentially. If not, I cannot use the OnTrigger functions. I have a hard drive attached to both the player and the platform, but it does not seem to affect anything. When a player is on the platform in some settings, he trembles and often just ends in failure.

+5

c # unity3d

muttley91 Mar 26 '13 at 17:45

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5 answers

, RayCast . RayCast "MovingPlatform", Y, , , "OnThePlatform". .

:

private bool isOnMovingPlatform;
private float offsetToKeepPlayerAbovePlatform = 2.2f;
private float min = 0.2f;
private float max = 1.2f;

private void Update()
{
RaycastHit hit;
if(Physics.Raycast (player.position, player.TransformDirection(Vector3.down), out hit))
{
    if(hit.transform.name.Contains("MovingPlatform"))
    {
        Transform movingPlatform  = hit.collider.transform;

        if(movingPlatform.position.y - player.position.y <= min && movingPlatform.position.y - player.position.y >= max)
        {
            isOnMovingPlatform = true;
        }
        else
        {
            isOnMovingPlatform = false;
        }
    }

    if(isOnMovingPlatform)
    {
        player.position = new Vector3(hit.transform.x, hit.transform.y + offsetToKeepPlayerAbovePlatform, 0);
    }
}
}