Unity3D研究院之代码使用IK动画（五十五）

using UnityEngine;
using System;
using System.Collections;

[RequireComponent(typeof(Animator))]  

public class IKCtrl : MonoBehaviour {

	//动画控制
	protected Animator animator;
	//是否开始IK动画
	public bool ikActive = false;
	//右手子节点参考的目标
	public Transform rightHandObj = null;

	void Start () 
	{
		//得到动画控制对象
		animator = GetComponent<Animator>();
	}

    //a callback for calculating IK
    //它是回调访法。
    //前提是在Unity导航菜单栏中打开Window->Animator打开动画控制器窗口，在这里必须勾选IK Pass！！！
	void OnAnimatorIK()
	{
	      if(animator) 
	      {

            //if the IK is active, set the position and rotation directly to the goal. 
            //即或IK动画后开始让右手节点寻找参考目标。 
			if(ikActive) 
			{

               //weight = 1.0 for the right hand means position and rotation will be at the IK goal (the place the character wants to grab)
               //设置骨骼的权重，1表示完整的骨骼，如果是0.5哪么骨骼权重就是一半呢，可移动或旋转的就是一半，大家可以修改一下参数试试。
			   animator.SetIKPositionWeight(AvatarIKGoal.RightHand,1f);
			   animator.SetIKRotationWeight(AvatarIKGoal.RightHand,1f);

			    //set the position and the rotation of the right hand where the external object is
				if(rightHandObj != null) 
				{
					//设置右手根据目标点而旋转移动父骨骼节点
					animator.SetIKPosition(AvatarIKGoal.RightHand,rightHandObj.position);
					animator.SetIKRotation(AvatarIKGoal.RightHand,rightHandObj.rotation);
				}					

			}

            //if the IK is not active, set the position and rotation of the hand back to the original position
			//如果取消IK动画，哪么重置骨骼的坐标。
			else 
			{			
				animator.SetIKPositionWeight(AvatarIKGoal.RightHand,0);
				animator.SetIKRotationWeight(AvatarIKGoal.RightHand,0);				
			}
		}
	}	  
}

					//	AvatarIKGoal.RightHand 右手
					//	AvatarIKGoal.LeftHand  左手
					//	AvatarIKGoal.LeftFoot  左脚
					//	AvatarIKGoal.RightFoot 右脚
					animator.SetIKPosition(AvatarIKGoal.RightHand,rightHandObj.position);
					animator.SetIKRotation(AvatarIKGoal.RightHand,rightHandObj.rotation);