Script code only seems to work on single instance of prefb - unity3d

Question

I am experiencing the strangest issue
I have a ray cast and when it touches a certain layer it calls my function which does a small animation.
The problem is, this only works on a single object, I have tried duplicating, copying the prefab, dragging prefab to the scene, it doesn't work.
Now I have this code below, and as you can see I have this line which allows me to access the script on public PlatformFall platfall; so I can call platfall.startFall();
Something I've noticed, If I drag a single item from the hierarchy to the public PlatFall in Inspector then that SINGLE object works as it should. ( in that it animates when startFall is called). HOWEVER, if I drag the prefab from my project to the inspector then they do not work. (Even if debug log shows that the method is called animation does not occur).
public class CharacterController2D : MonoBehaviour {
//JummpRay Cast
public PlatformFall platfall;
// LayerMask to determine what is considered ground for the player
public LayerMask whatIsGround;
public LayerMask WhatIsFallingPlatform;
// Transform just below feet for checking if player is grounded
public Transform groundCheck;
/*....
...*/
Update(){
// Ray Casting to Fallingplatform
isFallingPlatform = Physics2D.Linecast(_transform.position, groundCheck.position, WhatIsFallingPlatform);
if (isFallingPlatform)
{
Debug.Log("Here");
platfall.startFall();
}
Debug.Log(isFallingPlatform);
}
}
Platform Script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlatformFall : MonoBehaviour
{
public float fallDelay = 0.5f;
Animator anim;
Rigidbody2D rb2d;
void Awake()
{
Debug.Log("Awake Called");
anim = GetComponent<Animator>();
rb2d = GetComponent<Rigidbody2D>();
}
private void Start()
{
Debug.Log("Start Called");
}
//void OnCollisionEnter2D(Collision2D other)
//{
// Debug.Log(other.gameObject.tag);
// GameObject childObject = other.collider.gameObject;
// Debug.Log(childObject);
// if (other.gameObject.CompareTag("Feet"))
// {
// anim.SetTrigger("PlatformShake");
// Invoke("Fall", fallDelay);
// destroy the Log
// DestroyObject(this.gameObject, 4);
// }
//}
public void startFall()
{
anim.SetTrigger("PlatformShake");
Invoke("Fall", fallDelay);
Debug.Log("Fall Invoked");
// destroy the Log
// DestroyObject(this.gameObject, 4);
}
void Fall()
{
rb2d.isKinematic = false;
rb2d.mass = 15;
}
}

Answer 1

I understood from your post that you are always calling PlatformFall instance assigned from inspector. I think this changes will solve your problem.
public class CharacterController2D : MonoBehaviour {
private PlatformFall platfall;
private RaycastHit2D isFallingPlatform;
void FixedUpdate(){
isFallingPlatform = Physics2D.Linecast(_transform.position, groundCheck.position, WhatIsFallingPlatform);
if (isFallingPlatform)
{
Debug.Log("Here");
platfall = isFallingPlatform.transform.GetComponent<PlatformFall>();
platfall.startFall();
}
}
}
By the way, i assume that you put prefab to proper position to cast. And one more thing, you should make physics operations ,which affect your rigidbody, in FixedUpdate.