/*

* @author Valentin Simonov / http://va.lent.in/

*/

using UnityEngine;

namespace TouchScript.Utils

{

internal static class TransformUtils

{

public static Vector3 GlobalToLocalPosition(Transform transform, Vector3 global)

{

if (transform.parent == null) return global;

return transform.parent.InverseTransformPoint(global);

}

public static Vector3 GlobalToLocalDirection(Transform transform, Vector3 global)

{

if (transform.parent == null) return global;

return transform.parent.InverseTransformDirection(global);

}

public static Vector3 GlobalToLocalVector(Transform transform, Vector3 global)

{

var parent = transform.parent;

if (parent == null) return global;

var scale = parent.localScale;

var vector = GlobalToLocalVector(parent, global);

vector = Quaternion.Inverse(parent.localRotation) * vector;

vector.x = Mathf.Approximately(scale.x, 0) ? 0 : vector.x / scale.x;

vector.y = Mathf.Approximately(scale.y, 0) ? 0 : vector.y / scale.y;

vector.z = Mathf.Approximately(scale.z, 0) ? 0 : vector.z / scale.z;

return vector;

}

}

}