How to Allow a character to still jump once parented to a moving platform

Questions & Answers
1

Good day,
In my scene, I have a moving platform that moves up and down (Y-Axis). In my script when my player collides with this platform, then the platform is parented to the player’s rigidbody so they move together. The problem is I am unable to jump off this platform - as they share the same y-velocity (I assume).

public class PlayerMovement : MonoBehaviour
{
	public float speed = 6f;    
	public float lookSpeed = 10f;

	Vector3 movement;                  
	Animator anim;                    
	Rigidbody playerRigidbody;         

	bool grounded = false;
	float maxSlope = 60; 
	void Awake (){
		anim = GetComponent <Animator> ();
		playerRigidbody = GetComponent <Rigidbody> ();
	}
	

	void FixedUpdate (){
		float h = Input.GetAxisRaw ("Horizontal");
		float v = Input.GetAxisRaw ("Vertical");
		bool jumping = false;
		
		if (Input.GetButtonDown("Jump")) { 
			jumping = true;
		} 
		Move (h, v, jumping);

		Turning (h,v);
		
		Animating (h, v);
		playerRigidbody.AddForce(Physics.gravity * playerRigidbody.mass);
	}
	
	void Move (float h, float v, bool jumping){

		if (jumping && grounded) {
			playerRigidbody.velocity += new Vector3(0,12,0); 
			anim.Play("Jump"); 
		}
		else
			movement.Set (h, 0f, v);

		movement = movement.normalized * speed * Time.deltaTime;
		
		playerRigidbody.MovePosition (transform.position + movement);
	}
	
	void Turning (float h, float v){
		if(h != 0 || v != 0)
			transform.rotation = Quaternion.LookRotation(movement * lookSpeed);
		
	}

	void Animating (float h, float v){
		bool walking = h != 0f || v != 0f;

		anim.SetBool ("isRunning", walking);
	}

	void OnCollisionStay(Collision collider) {
		foreach (ContactPoint contact in collider.contacts) {
			if(Vector3.Angle(contact.normal, Vector3.up)< maxSlope)
				grounded = true;
		}

		Rigidbody otherRigidbody = collider.rigidbody;

		if (otherRigidbody != null && otherRigidbody.gameObject.tag == "MovingPlatform")
		{
			 playerRigidbody.transform.parent = collider.transform;
		}
	}

	void OnCollisionExit(Collision collider){
		grounded = false;
		Rigidbody otherRigidbody = collider.rigidbody;
		if (otherRigidbody != null && otherRigidbody.gameObject.tag == "MovingPlatform"){
			playerRigidbody.transform.parent = null;
		}
	}
}

I am able to walk off the platform just not jump off. I suspect I will encounter the same problem with a platform moving on the horizontal axis?

I have tried other ways to get the player to move with the platform such as adding a physicMaterial and making their velocities equal each other but parenting seemed to be the only one to work.

Thank you for helping.

2

Can you try not parenting, just keep track of a new reference variable - GameObject PlatFormIAmOn.

When you OnCollisionStay on it: PlatFormIAmOn = collision.transform.gameobject;

and then in your Update() just compensate local velocity/position/etc with the PlatFormIAmOn velocition/position/etc if your GameObject is not null.

Then when jumping make it null again.

Maybe? sorry for the pseudo code