Little Question regarding rigidbody gravity and addforce.

Questions & Answers
1

Hi,

I’m having some problems with AddForce not working after I set the use gravity of my rigidbody to false.

So my question is: Does Addforce work when gravity is turned off?

Thanks in advance!

~Nick

EDIT:

Hmm I think I already figured out what went wrong, still seems weird tho, whenever I change the dodge keys in my script it stops working. the default A and D keys work fine. it seems like it has something to do with my character already moving when the “dodge” is initiated, as A and D are also used to move left and right normally. When changed to Q and E it stops working. Here’s a bit of code:

#pragma strict
var dodgeKeyRight: KeyCode = KeyCode.D;
var dodgeKeyLeft: KeyCode = KeyCode.A;
var lastTime: float = -1.0f;
var player: GameObject;
var speed: float = 100;
var curHor: float;
var curVert: float;
var curJump: float;
var hitGround: boolean = false;
var baseSpeed: Vector3;
var baseSideways: Vector3;
var maxSpeed: float = 2;
var shootScript: Shooter;

function Awake()
{
	player = GameObject.FindWithTag("Player");
	shootScript = player.GetComponent(Shooter);
}

function FixedUpdate()
{
	CheckGround();
	if(CheckSpeed())
	{
		Movement();
		Dodge();
	}
	if(shootScript.pullIt == true)
	{
		player.rigidbody.useGravity = false;	
	}
	else if(shootScript.pullIt == false)
	{
		player.rigidbody.useGravity = true;
	}
}
function Dodge()
{
	if (Input.GetKeyDown(dodgeKeyRight))
	{
	    if (Time.time - lastTime < 0.3f)
	    {
	        lastTime = -1.0;
	        player.rigidbody.AddForce(transform.right*speed*5);
	        player.rigidbody.AddForce(transform.up*speed*3);
	    } 
	    else
	    {
	        lastTime = Time.time;
	    }
	}
	if (Input.GetKeyDown(dodgeKeyLeft))
	{
	    if (Time.time - lastTime < 0.3f)
	    {
	        lastTime = -1.0;
	        player.rigidbody.AddForce(-transform.right*speed*5);
	        player.rigidbody.AddForce(transform.up*speed*3);
	    } 
	    else
	    {
	        lastTime = Time.time;
	    }
	}

}
function Movement()
{
	curHor = Input.GetAxis("Horizontal");
	curVert = Input.GetAxis("Vertical");
	curJump = Input.GetAxis("Jump");

	if(hitGround)
	{
		baseSpeed = transform.forward*curVert*speed/2;
		baseSideways = transform.right*curHor*speed/2;
		player.rigidbody.AddForce(baseSideways);
		player.rigidbody.AddForce(baseSpeed);
		player.rigidbody.AddForce(transform.up*curJump*speed*5);
	}
	if(!Input.GetAxis("Vertical") && !Input.GetAxis("Horizontal") && hitGround)
	{
		player.rigidbody.drag = 100;
	}
	else
	{
		player.rigidbody.drag = 0;
	}

	if(Input.GetAxis("Jump"))
	{
		player.rigidbody.drag = 0;
	}
}

function CheckGround()
{
	var hit: RaycastHit;
	if (Physics.SphereCast (transform.position, 0.5, -transform.up, hit, .5))
	{
		hitGround = true;
	}
	else if (!Physics.SphereCast (transform.position, 0.5, -transform.up, hit, .5))
	{
		hitGround = false;
	}
}
function CheckSpeed():boolean
{
	if(player.rigidbody.velocity.z < maxSpeed && 
		player.rigidbody.velocity.z > -maxSpeed &&
		player.rigidbody.velocity.x < maxSpeed &&
		player.rigidbody.velocity.x > -maxSpeed)
		{
			return true;
		}
}
2

Yes it does, your problem must lie somewhere else. Maybe you could post the part of your script dealilng with forces, and elaborate on “some problems with AddForce”?

Note that with “isKinematic” enabled, forces/physics will be ignored.

3

If you haven’t changed the keys in the input manager then rigid body.drag will be set to 100 if the dodge keys don’t match the setting for the horizontal axis. Per your Movement function.