Unity Animator动画状态机 深入理解（二）IK控制

IK还是一个很神奇和实用的东西啊，起码可以用代码来控制人物骨骼位置还是很爽的。因为不是动画师~

这篇可能跟Animator没啥关系了哈，都是代码层的。

看了一官方的案例，老的，有些问题，自己修改了一下，达到了效果。

官方建议把所有的IK操作放在OnAnimatorIK中进行。

如果我们要进行IK操作，先要绑定IK位置。IK能控制的官方都给了enum

 

然后我们要设置权重Weight，范围为0~1，这里都设成1

             avatar.SetIKPositionWeight(AvatarIKGoal.LeftFoot, 1.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.LeftFoot, 1.0f);
             avatar.SetIKPositionWeight(AvatarIKGoal.LeftHand, 1.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.LeftHand, 1.0f);
             avatar.SetIKPositionWeight(AvatarIKGoal.RightFoot, 1.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.RightFoot, 1.0f);
             avatar.SetIKPositionWeight(AvatarIKGoal.RightHand, 1.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.RightHand, 1.0f);
             avatar.SetLookAtWeight(1.0f, 0.3f, 1.0f, 0.5f);

如果我们把LeftFoot的权重设为0，则会出现以下情况

在官方给的脚本中IK的绑定并没有在OnAnimatorIK中，而放到了Update中，然后就出现了绑定失败的问题。

所以我把他们都放到了OnAnimatorIK中。就可以了。

关于IK的操作~，给的少。

     //设置右手IK位置
     avatar.SetIKPosition(AvatarIKGoal.RightHand, rightHandObj.position);
     //设置右手IK旋转
     avatar.SetIKRotation(AvatarIKGoal.RightHand, rightHandObj.rotation);
     //获取右手IK位置
     rightHandObj.position = avatar.GetIKPosition(AvatarIKGoal.RightHand);
     //获取右手IK旋转
     rightHandObj.rotation = avatar.GetIKRotation(AvatarIKGoal.RightHand);    

上完整代码~ （ikActive）没开启时球跟随人，开启时人跟随球。

 using UnityEngine;
 using System.Collections;

 public class MyIK : MonoBehaviour {

     public Transform bodyObj = null;
     public Transform leftFootObj = null;
     public Transform rightFootObj = null;
     public Transform leftHandObj = null;
     public Transform rightHandObj = null;
     public Transform lookAtObj = null;
     private Animator avatar;
     public bool ikActive = false;

     void Start()
     {
         avatar = GetComponent<Animator>();
     }

     void OnAnimatorIK(int layerIndex)
     {
         if (avatar == null) return;

         if (ikActive)
         {
             avatar.SetIKPositionWeight(AvatarIKGoal.LeftFoot, 0.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.LeftFoot, 1.0f);
             avatar.SetIKPositionWeight(AvatarIKGoal.LeftHand, 1.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.LeftHand, 1.0f);
             avatar.SetIKPositionWeight(AvatarIKGoal.RightFoot, 1.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.RightFoot, 1.0f);
             avatar.SetIKPositionWeight(AvatarIKGoal.RightHand, 1.0f);
             avatar.SetIKRotationWeight(AvatarIKGoal.RightHand, 1.0f);
             avatar.SetLookAtWeight(1.0f, 0.3f, 1.0f, 0.5f);

             if (bodyObj != null)
             {
                 avatar.bodyPosition = bodyObj.position;
                 avatar.bodyRotation = bodyObj.rotation;
             }

             if (leftHandObj != null)
             {
                 avatar.SetIKPosition(AvatarIKGoal.LeftHand, leftHandObj.position);
                 avatar.SetIKRotation(AvatarIKGoal.LeftHand, leftHandObj.rotation);
             }
             if (rightFootObj != null)
             {
                 avatar.SetIKPosition(AvatarIKGoal.RightFoot, rightFootObj.position);
                 avatar.SetIKRotation(AvatarIKGoal.RightFoot, rightFootObj.rotation);
             }
             if (leftFootObj != null)
             {
                 avatar.SetIKPosition(AvatarIKGoal.LeftFoot, leftFootObj.position);
                 avatar.SetIKRotation(AvatarIKGoal.LeftFoot, leftFootObj.rotation);
             }
             if (rightHandObj != null)
             {
                 avatar.SetIKPosition(AvatarIKGoal.RightHand, rightHandObj.position);
                 avatar.SetIKRotation(AvatarIKGoal.RightHand, rightHandObj.rotation);
             }

             if (lookAtObj != null)
                 avatar.SetLookAtPosition(lookAtObj.position);
         }
         else
         {
             if (bodyObj != null)
             {
                 bodyObj.position = avatar.bodyPosition;
                 bodyObj.rotation = avatar.bodyRotation;
             }

             if (leftFootObj != null)
             {
                 leftFootObj.position = avatar.GetIKPosition(AvatarIKGoal.LeftFoot);
                 leftFootObj.rotation = avatar.GetIKRotation(AvatarIKGoal.LeftFoot);
             }

             if (rightFootObj != null)
             {
                 rightFootObj.position = avatar.GetIKPosition(AvatarIKGoal.RightFoot);
                 rightFootObj.rotation = avatar.GetIKRotation(AvatarIKGoal.RightFoot);
             }

             if (leftHandObj != null)
             {
                 leftHandObj.position = avatar.GetIKPosition(AvatarIKGoal.LeftHand);
                 leftHandObj.rotation = avatar.GetIKRotation(AvatarIKGoal.LeftHand);
             }

             if (rightHandObj != null)
             {
                 rightHandObj.position = avatar.GetIKPosition(AvatarIKGoal.RightHand);
                 rightHandObj.rotation = avatar.GetIKRotation(AvatarIKGoal.RightHand);
             }

             if (lookAtObj != null)
             {
                 lookAtObj.position = avatar.bodyPosition + avatar.bodyRotation * new Vector3(, 0.5f, );
             }
             avatar.SetIKPositionWeight(AvatarIKGoal.LeftFoot, );
             avatar.SetIKRotationWeight(AvatarIKGoal.LeftFoot, );
             avatar.SetIKPositionWeight(AvatarIKGoal.LeftHand, );
             avatar.SetIKRotationWeight(AvatarIKGoal.LeftHand, );
             avatar.SetIKPositionWeight(AvatarIKGoal.RightFoot, );
             avatar.SetIKRotationWeight(AvatarIKGoal.RightFoot, );
             avatar.SetIKPositionWeight(AvatarIKGoal.RightHand, );
             avatar.SetIKRotationWeight(AvatarIKGoal.RightHand, );
             avatar.SetLookAtWeight(0.0f);
         }
     }

 }

附一个彩蛋，IK有意思~~呵呵~ o(*￣▽￣*)ブ