using UnityEngine;
using System.Collections;

public class FunctionTest : MonoBehaviour {  
   

void TestFunction(){ }
                    
                    }

FunctionTest.TestFunction()

error CS0120: An object reference is required to access non-static member `FunctionTest.TestFunction()'

function OnCollisionEnter( collision:Collision )
{
gameObject.rigidbody.UseGravity = true;
}

gameObject.rigidbody.UseGravity = false;

function OnCollisionEnter( Player:Collision )
{
gameObject.rigidbody.UseGravity = true;
}

function OnCollisionEnter( other:Collision )
{
gameObject.rigidbody.UseGravity = true;
}

public var ObjectForCollison:GameObject;
public var x:int;

function OnCollisionEnter(ObjectForCollision) {
x+=1;
}

x+=1;

gameObject.rigidbody.UseGravity = true;

GameObject foo=GameObject.Find("GOна котором висит скрипт").GetComponent("FunctionTest");
foo.TestFunction();

gameObject.GetComponent<FunctionTest>().TestFunction();
//Думаю не надо пояснять, что gameObject это текущий го на котором висит скрипт.

Player.rigidbody.UseGravity = true;  

function OnCollisionEnter(collision:Collision)
{
     if(collision.gameObject.tag == "Player")
     {
        gameObject.rigidbody.UseGravity = true;  
     }
}

function OnTriggerEnter (other : Collider) {    
       
if(other.gameObject.name == "Pesok"){
       
other.gameObject.AddComponent(Rigidbody);
rigidbody.mass = 10;

}    

}