Velocity of multiple rigidbody obiects in array

Questions & Answers
1

Hi,
I’m trying input few rigidbody objects in array by tag, and then get the sum of velociy of all objects in array. But it’s not working, error: “velocity is not member of Array.” Here is code:

var allObjects          :   Array;
var allObjectsVelocity  : 	float;

function Start () {
	//input all tagged objects in array
	allObjects = GameObject.FindGameObjectsWithTag("Red") + GameObject.FindGameObjectsWithTag("Blue") + GameObject.FindGameObjectsWithTag("Green");
}

function Update () {
	//get valocity of multiple object
	allObjectsVelocity = allObjects.velocity.magnitude;
	print(allObjectsVelocity);
}

Do you have any ideas? Thanks for help.

5

you have 2 options one is. Store an array of rigidbodies or loop through game objects.

Option 1:

var allObjects : Rigidbody;

function Start()
{
      allObjects = new Rigidbody[3];
      allOjects[0] = GameObject.FindGameObjectsWithTag("Red").rigidbody;
      allOjects[1] = GameObject.FindGameObjectsWithTag("Blue").rigidbody;
      allOjects[2] = GameObject.FindGameObjectsWithTag("Green").rigidbody;
}

function Update()
{
     float allObjectsVelocity = 0;
     foreach(rigid : Rigidbody in allObjects)
     {
          allObjectsVelocity += rigid.velocity.magnitude;
     }
     print(allObjectsVelocity);
}

Options 2:

function Update()
{
     float allObectsVelocity = 0;
     foreach(var go : GameObject in allObjects)
     {
          allObjectsVelocity += go.rigidbody.velocity.magnitude;
     }
     print(allObjectsVelocity);
}
2

The issue is that the return type of allObjects is an Array you need to loop through all of the Array Items to sum the magnitude.

function Update() {
    allObjectsVelocity = 0;
    foreach(rigid : Rigidbody in allObjects)
    {
        allObjectsVelocity += rigid.velocity.magnitude;
    }

    print(allObjectsVelocity);
}

This is not tested and I usually use C# so syntax may not be perfect.

3

ok, I’m trying but it’s still something wrong. Now the code looks like:

var allObjects	        :   Array = new Array();
var allObjectsVelocity	:   float;
var i                   :   int;


function Start () {
	//input all tagged objects in array
	allObjects = GameObject.FindGameObjectsWithTag("Red") + GameObject.FindGameObjectsWithTag("Blue") + GameObject.FindGameObjectsWithTag("Green");
}

function Update () {
	allObjectsVelocity = 0;

    for (i=0; i<allObjects.length; i++)
    	{
    	allObjects *= Rigidbody in allObjects;*

_ allObjectsVelocity += allObjects*.velocity.magnitude;_
_ }*_

print("test velocity : " +allObjectsVelocity);

}
but now I have error : “velocity is not member of object”

4

Now I think is better and simpler, but problem is now “Cannot cast from source type to destination type”. Do you have any ideas how fix that. Code :

function Update () {
	
	allObjectsVelocity = 0;
    for (var rigid : Rigidbody in allObjects)
    	{
    	allObjectsVelocity += rigid.velocity.magnitude;
    	}
    

    print(allObjectsVelocity);

}

Thanks