Procedural Animation的百科解释：https://en.wikipedia.org/wiki/Procedural_animation

想深入了解UE4引擎中的： control rig， Unity引擎中的：Animation Rigging

最近在学习Procedural Animation相关的只是，先从2D开始。

最好理解的程序化动画就是贪吃蛇的运动，在此基础上改造添加身体部分的运动。  

先简单代码，转向目标(鼠标位置)并向目标移动

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

[RequireComponent(typeof(Rigidbody))]
public class Controller : MonoBehaviour
{
    public float _speed = 1f;

    private Rigidbody _rigidbody;

    // Start is called before the first frame update
    void Start()
    {
        _rigidbody = GetComponent<Rigidbody>();
    }

    // Update is called once per frame
    void FixedUpdate()
    {
        float multiplier = 1f;
        if (Input.GetKey(KeyCode.LeftShift))
        {
            multiplier = 2f;
            GetComponentInChildren<ProceduralAnimation>().running = true;
        }
        else
            GetComponentInChildren<ProceduralAnimation>().running = false;

        if (_rigidbody.velocity.magnitude < _speed * multiplier)
        {

            float value = Input.GetAxis("Vertical");
            if (value != 0)
                _rigidbody.AddForce(0, 0, value * Time.fixedDeltaTime * 1000f);
            value = Input.GetAxis("Horizontal");
            if (value != 0)
                _rigidbody.AddForce(value * Time.fixedDeltaTime * 1000f, 0f, 0f);
        }
    }
}

然后添加触角逻辑：

创建空对象Tentacle，添加LineRenderer 组件并进行设置：

创建脚本Tentacle.cs 并添加到对象上。

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

public class Tentacle : MonoBehaviour
{
    public int Length;
    public LineRenderer LineRend;
    public Vector3[] SegmentPoses;
    public Transform TargetDir;    // 是头部位置
    public float TargetDist;

    private Vector3[] SegmentV;
    public float SmoothSpeed;
    public float TrailSpeed;

    // Start is called before the first frame update
    void Start()
    {
        LineRend.positionCount = Length;
        SegmentPoses = new Vector3[Length];
        SegmentV = new Vector3[Length];
    }

    // Update is called once per frame
    void Update()
    {
        SegmentPoses[0] = TargetDir.position;
        for (int i = 1; i < SegmentPoses.Length; i++)
        {
            SegmentPoses[i] = Vector3.SmoothDamp(SegmentPoses[i], SegmentPoses[i - 1] + TargetDir.right * TargetDist, ref SegmentV[i], SmoothSpeed + i / TrailSpeed);
        }
        LineRend.SetPositions(SegmentPo