Rotate when rolling, forward/backward on pitching?

Target Platforms Mobile
1

I’m trying to make a character rotate around it’s own Y-axis when the iPad is tipping left or right, and move forward (or backward) along it’s Z-axis when the device is tipping forward and backward. This is close, but not exact … how do I add the Z-axis movement? (My commented out stuff doesn’t work, btw.)

var speed = 5.0; 
private var myTransform : Transform;


function Start() {
	
	// Cache "hidden" GetComponent calls for extra speed
	myTransform = transform;
	
}

function Update () {
	
	// assume that device is held parallel to the ground and Home button is in the right hand
	var dir : Vector3 = Vector3.zero;
	
	dir.x = -iPhoneInput.acceleration.y; // left and right
	dir.z = iPhoneInput.acceleration.x; // fwd and bkwd

	// clamp acceleration vector to unit sphere
	if (dir.sqrMagnitude > 1) // 1
		dir.Normalize();

	// Make the player move 10m/s instead of 10m/f...
        dir *= Time.deltaTime;

	// Move and rotate player in direction iPad is tipped in
	transform.Translate (dir * speed);
	// transform.Rotate(0, (dir.x * 720), 0); --- not working with forward movement but spins around fine (I think?)
	
	// snipped
	
}
2

If you want the character to rotate without also moving left/right, you need to remove the X component from the movement vector and use that value in the transform.Rotate call instead.