using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public static class TransformUtility
{

	public static Matrix4x4 GetLocalToWorldMatrix(Transform transform)
	{
		Matrix4x4 mat = Matrix4x4.identity;
		while(transform != null)
		{
			Matrix4x4 m = Matrix4x4.identity;
			m.SetTRS2(transform.localPosition, transform.localRotation, transform.localScale);
			mat = m * mat;
			transform = transform.parent;
		}

		return mat;
	}

	public static Matrix4x4 GetLocalToWorldMatrixNoScale(Transform transform)
	{
		Matrix4x4 mat = Matrix4x4.identity;
		while (transform != null)
		{
			Matrix4x4 m = Matrix4x4.identity;
			m.SetTR(transform.localPosition, transform.localRotation);
			mat = m * mat;
			transform = transform.parent;
		}

		return mat;
	}

	public static Matrix4x4 GetLocalToWorldMatrixRootBone(Transform transform)
	{
		//Matrix4x4 mat = Matrix4x4.identity;
		//while (transform != null)
		//{
		//	Matrix4x4 m = Matrix4x4.identity;
		//	m = Matrix4x4.Rotate(transform.localRotation);
		//	mat = m * mat;
		//	transform = transform.parent;
		//}
		//mat.SetColumn(3, new Vector4(trans.position.x, trans.position.y, trans.position.z, 1));

		Matrix4x4 mat = Matrix4x4.Rotate(transform.rotation);
		mat.SetColumn(3, new Vector4(transform.position.x, transform.position.y, transform.position.z, 1));

		return mat;
	}

}