Help with a simple jump script

I am writing a basic player controller and I am running into problems with my jump script. When I press spacebar, nothing happens.

I have this code in my update:

//jump if player presses space bar

And this is the actual jump method:

//performs a jump 
	public void Jump(){
		Vector3 up = transform.TransformDirection(Vector3.up);

What am I doing wrong here? Thanks!

You’re probably using a small jumpForce: AddForce in the default mode applies the force during a single physics cycle, and the result is an increase in velocity in the force direction proportional to the time the force is applied. You could use ForceMode.Impulse, for instance:

  rigidbody.AddForce(up * jumpForce, ForceMode.Impulse);

The Impulse mode concentrate in a single physics cycle all the acceleration the body would experience if the force were applied during one second. Another easier alternative is to directly add the desired velocity to the rigidbody:

 rigidbody.velocity += up * jumpSpeed; // jumpSpeed could be 8.0f, for instance

In any case, notice that you’re transforming the up direction to the rigidbody space - it will jump to its local up direction, what may seem weird when the character isn’t upright. If this is a problem, just use Vector3.up instead of up.

NOTE: The whole thing only makes sense if your character is a rigidbody. If it’s a CharacterController, forget about forces and use the example script supplied by the docs in 1.