Input.Acceleration Help / Change default "parallel to ground" position of iPad

Unity Engine
1

I am creating an iPad game and the controls are based on the accelerometer. Using the unity scripting reference I was able to get the following script to work. However, this script is based on the assumption that “we assume that device is held parallell to the ground” " Home button is in the right hand corner."

So my question is: How would I go about changing that? I can’t seem to find any solutions in the reference. Any ideas?

var speed = 1000.0;
var targetSpeed = 18;   //how fast the target moves
function Update () 
	{

    // we assume that device is held parallel to the ground
    // and Home button is in the right hand
 	var dir : Vector3 = Vector3.zero;   
    // remap device acceleration axis to game coordinates:
    //  1) XY plane of the device is mapped onto XZ plane
    //  2) rotated 90 degrees around Y axis
    dir.x = -Input.acceleration.y;
    dir.y = Input.acceleration.x;
    dir.z = 0;
    
    // clamp acceleration vector to unit sphere
    if (dir.sqrMagnitude > 1)
        dir.Normalize();
    
    // Make it move 10 meters per second instead of 10 meters per frame...
    dir *= Time.deltaTime*targetSpeed;
    

        
    // Move object
   transform.Translate (dir * speed);
   
 if (transform.position.x > 150  transform.position.x < 875  transform.position.y > -625  transform.position.y < -145 ) 
 { transform.Translate (dir * speed);
 }
 
 else
{  transform.Translate (dir * -speed*1.1);
 }        
}
2

Based on this thread here is the solution that I came up with.

However, the averages of the accelerometer only works if var horizontalAcc = Vector3(0,0,-1). I tried changing the value to (0,0,0) and it returned the ipad to the default. Can someone explain this to me??

var speed = 100;
var targetSpeed = 20;   //how fast the target moves

var dir : Vector3 = Vector3.zero;
var rot0 : Quaternion; // rotation to correct initial angle
var horizontalAcc = Vector3(0, 0, -1); // see note below ... originally(0,0, -1) This allows the averaging???

function Start(){
  // averages the accelerometer during 10 frames
  var acc0 = Vector3.zero;
  for (var i=0; i<10; i++){
    acc0 = acc0 + Input.acceleration;
    yield; // returns here next frame
  }
  acc0 = acc0 / 10.0;
  // calculates the rotation necessary to fix the tilt
  rot0 = Quaternion.FromToRotation(acc0, horizontalAcc);

}

// rotate the accelerometer readings:
//  var reading = rot0 * Input.acceleration;
//  acc = Vector3.Lerp(acc, reading, Time.deltaTime);



function Update () 
	{

    // we assume that device is held parallel to the ground
    // and Home button is in the right hand   
 	var reading = rot0 * Input.acceleration;
 //	reading.z = 0;


    // remap device acceleration axis to game coordinates:
    //  1) XY plane of the device is mapped onto XZ plane
    //  2) rotated 90 degrees around Y axis
    dir.x = -reading.y;
    dir.y = reading.x;
	
	
//    dir.z = 0;
    
    // clamp acceleration vector to unit sphere
    if (dir.sqrMagnitude > 1)
        dir.Normalize();
// if (acc.sqrMagnitude > 1)
//        acc.Normalize();
    
  // Make it move 10 meters per second instead of 10 meters per frame...
  dir *= Time.deltaTime*targetSpeed;
//	acc *= Time.deltaTime*targetSpeed;
    

        
    // Move object
//   transform.Translate (dir * speed);
 if (gameGUI.notStarted == false){ 
 
    
     
    if ( abletomove == true)
		{
			renderer.sharedMaterial = material1;
			transform.position.x = Mathf.Clamp(transform.position.x, 150, 875);
  			transform.position.y = Mathf.Clamp(transform.position.y, -625, -145);
 			transform.Translate (dir * speed);
			
		}