Unity Animator動畫狀態機 深入理解（二）IK控制

IK還是一個很神奇和實用的東西啊，起碼可以用代碼來控制人物骨骼位置還是很爽的。因為不是動畫師~

這篇可能跟Animator沒啥關系了哈，都是代碼層的。

看了一官方的案例，老的，有些問題，自己修改了一下，達到了效果。

官方建議把所有的IK操作放在OnAnimatorIK中進行。

如果我們要進行IK操作，先要綁定IK位置。IK能控制的官方都給了enum

 

然后我們要設置權重Weight，范圍為0~1，這里都設成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);

如果我們把LeftFoot的權重設為0，則會出現以下情況

在官方給的腳本中IK的綁定並沒有在OnAnimatorIK中，而放到了Update中，然后就出現了綁定失敗的問題。

所以我把他們都放到了OnAnimatorIK中。就可以了。

關於IK的操作~，給的少。

    //設置右手IK位置
    avatar.SetIKPosition(AvatarIKGoal.RightHand, rightHandObj.position);
    //設置右手IK旋轉
    avatar.SetIKRotation(AvatarIKGoal.RightHand, rightHandObj.rotation);
    //獲取右手IK位置
    rightHandObj.position = avatar.GetIKPosition(AvatarIKGoal.RightHand);
    //獲取右手IK旋轉
    rightHandObj.rotation = avatar.GetIKRotation(AvatarIKGoal.RightHand);    

上完整代碼~ （ikActive）沒開啟時球跟隨人，開啟時人跟隨球。

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, 0.5f, 1);
            }
            avatar.SetIKPositionWeight(AvatarIKGoal.LeftFoot, 0);
            avatar.SetIKRotationWeight(AvatarIKGoal.LeftFoot, 0);
            avatar.SetIKPositionWeight(AvatarIKGoal.LeftHand, 0);
            avatar.SetIKRotationWeight(AvatarIKGoal.LeftHand, 0);
            avatar.SetIKPositionWeight(AvatarIKGoal.RightFoot, 0);
            avatar.SetIKRotationWeight(AvatarIKGoal.RightFoot, 0);
            avatar.SetIKPositionWeight(AvatarIKGoal.RightHand, 0);
            avatar.SetIKRotationWeight(AvatarIKGoal.RightHand, 0);
            avatar.SetLookAtWeight(0.0f);
        }
    }

}

附一個彩蛋，IK有意思~~呵呵~ o(*￣▽￣*)ブ