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(1) 问题描述：
在Unity中，有些工作注重人物姿态、可以忽略人物的触碰体积和刚体属性，这种情况适合将人物抽象为简单的点线模型（火柴人模型），具有结构简单、直观、响应速度快等优点。 在这里笔者用一个项目中的例子，在Unity3D中建立人体18节点骨骼的动态简单点线模型。
项目详情见全文 OpenPose的Unity3D实现 https://blog.csdn.net/BenJamin_Blue/article/details/86567246
(2) 问题分析：
点线模型的精髓之处在于方便直观地展示人物的动态。因此，在没有输入坐标数据的时候，我们不妨令所有代表节点的18个小球在世界坐标系的原点处重合。如图所示：  其中小球的Hierarchy界面如图所示  当有坐标匹配时，只需将数据赋值、移动节点小球到相应位置即可。 为了方便区分肢体，需在小球间对应地加上线条，这里使用LineRenderer渲染器。
(3) 代码：
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Threading;
public class MoveJoints : MonoBehaviour
{
#region definition
public float speed = 5f;
//line renderer*4
private LineRenderer lineRenderer1;
private LineRenderer lineRenderer2;
private LineRenderer lineRenderer3;
private LineRenderer lineRenderer4;
private int lineLength = 300;
GameObject LEar16;
GameObject LEye14;
GameObject MNose0;
GameObject REye15;
GameObject REar17;
GameObject MMid1;
GameObject LShoulder2;
GameObject RShoulder5;
GameObject LElbow3;
GameObject RElbow6;
GameObject LWrist4;
GameObject RWrist7;
GameObject LAss8;
GameObject RAss11;
GameObject LKnee9;
GameObject RKnee12;
GameObject LFoot10;
GameObject RFoot13;
#endregion
//将场景的物体关联到该脚本中
void InitObject()
{
LEar16 = GameObject.Find("LEar16");
LEye14 = GameObject.Find("LEye14");
MNose0 = GameObject.Find("MNose0");
REye15 = GameObject.Find("REye15");
REar17 = GameObject.Find("REar17");
MMid1 = GameObject.Find("MMid1");
LShoulder2 = GameObject.Find("LShoulder2");
RShoulder5 = GameObject.Find("RShoulder5");
LElbow3 = GameObject.Find("LElbow3");
RElbow6 = GameObject.Find("RElbow6");
LWrist4 = GameObject.Find("LWrist4");
RWrist7 = GameObject.Find("RWrist7");
LAss8 = GameObject.Find("LAss8");
RAss11 = GameObject.Find("RAss11");
LKnee9 = GameObject.Find("LKnee9");
RKnee12 = GameObject.Find("RKnee12");
LFoot10 = GameObject.Find("LFoot10");
RFoot13 = GameObject.Find("RFoot13");
// Line1 = GameObject.Find("Line1");
lineRenderer1 = (LineRenderer)MNose0.GetComponent("LineRenderer");
lineRenderer2 = (LineRenderer)MMid1.GetComponent("LineRenderer");
lineRenderer3 = (LineRenderer)LShoulder2.GetComponent("LineRenderer");
lineRenderer4 = (LineRenderer)LElbow3.GetComponent("LineRenderer");
}
// Use this for initialization
void Start()
{
InitObject();
lineRenderer1.positionCount = lineLength;
lineRenderer2.positionCount = lineLength;
lineRenderer3.positionCount = lineLength;
lineRenderer4.positionCount = lineLength;
lineRenderer1.positionCount = 7;
lineRenderer2.positionCount = 7;
lineRenderer3.positionCount = 4;
lineRenderer4.positionCount = 4;
}
// Update is called once per frame
void Update()
{
float step = speed * Time.deltaTime;
//move joints using interpolation method
//注：这里运动节点的方法仅做参考！
LEar16.transform.localPosition = new Vector3(Mathf.Lerp(LEar16.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[16], step), Mathf.Lerp(LEar16.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[16], step), 0);
MNose0.transform.localPosition = new Vector3(Mathf.Lerp(MNose0.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[0], step), Mathf.Lerp(MNose0.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[0], step), 0);
LEye14.transform.localPosition = new Vector3(Mathf.Lerp(LEye14.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[14], step), Mathf.Lerp(LEye14.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[14], step), 0);
REye15.transform.localPosition = new Vector3(Mathf.Lerp(REye15.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[15], step), Mathf.Lerp(REye15.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[15], step), 0);
MMid1.transform.localPosition = new Vector3(Mathf.Lerp(MMid1.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[1], step), Mathf.Lerp(MMid1.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[1], step), 0);
LShoulder2.transform.localPosition = new Vector3(Mathf.Lerp(LShoulder2.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[2], step), Mathf.Lerp(LShoulder2.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[2], step), 0);
RShoulder5.transform.localPosition = new Vector3(Mathf.Lerp(RShoulder5.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[5], step), Mathf.Lerp(RShoulder5.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[5], step), 0);
LElbow3.transform.localPosition = new Vector3(Mathf.Lerp(LElbow3.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[3], step), Mathf.Lerp(LElbow3.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[3], step), 0);
RElbow6.transform.localPosition = new Vector3(Mathf.Lerp(RElbow6.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[6], step), Mathf.Lerp(RElbow6.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[6], step), 0);
LWrist4.transform.localPosition = new Vector3(Mathf.Lerp(LWrist4.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[4], step), Mathf.Lerp(LWrist4.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[4], step), 0);
RWrist7.transform.localPosition = new Vector3(Mathf.Lerp(RWrist7.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[7], step), Mathf.Lerp(RWrist7.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[7], step), 0);
LAss8.transform.localPosition = new Vector3(Mathf.Lerp(LAss8.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[8], step), Mathf.Lerp(LAss8.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[8], step), 0);
RAss11.transform.localPosition = new Vector3(Mathf.Lerp(RAss11.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[11], step), Mathf.Lerp(RAss11.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[11], step), 0);
LKnee9.transform.localPosition = new Vector3(Mathf.Lerp(LKnee9.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[9], step), Mathf.Lerp(LKnee9.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[9], step), 0);
RKnee12.transform.localPosition = new Vector3(Mathf.Lerp(RKnee12.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[12], step), Mathf.Lerp(RKnee12.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[12], step), 0);
LFoot10.transform.localPosition = new Vector3(Mathf.Lerp(LFoot10.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[10], step), Mathf.Lerp(LFoot10.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[10], step), 0);
RFoot13.transform.localPosition = new Vector3(Mathf.Lerp(RFoot13.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[13], step), Mathf.Lerp(RFoot13.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[13], step), 0);
REar17.transform.localPosition = new Vector3(Mathf.Lerp(REar17.transform.localPosition.x, 0.1f * JsonTest.pose_joint_x[17], step), Mathf.Lerp(REar17.transform.localPosition.y, -0.1f * JsonTest.pose_joint_y[17], step), 0);
//it requires 4 lines to connect all the joints
lineRenderer1.SetPosition(0, LEar16.transform.localPosition);
lineRenderer1.SetPosition(1, LEye14.transform.localPosition);
lineRenderer1.SetPosition(2, MNose0.transform.localPosition);
lineRenderer1.SetPosition(3, MMid1.transform.localPosition);
lineRenderer1.SetPosition(4, LShoulder2.transform.localPosition);
lineRenderer1.SetPosition(5, LElbow3.transform.localPosition);
lineRenderer1.SetPosition(6, LWrist4.transform.localPosition);
lineRenderer2.SetPosition(0, REar17.transform.localPosition);
lineRenderer2.SetPosition(1, REye15.transform.localPosition);
lineRenderer2.SetPosition(2, MNose0.transform.localPosition);
lineRenderer2.SetPosition(3, MMid1.transform.localPosition);
lineRenderer2.SetPosition(4, RShoulder5.transform.localPosition);
lineRenderer2.SetPosition(5, RElbow6.transform.localPosition);
lineRenderer2.SetPosition(6, RWrist7.transform.localPosition);
lineRenderer3.SetPosition(0, LFoot10.transform.localPosition);
lineRenderer3.SetPosition(1, LKnee9.transform.localPosition);
lineRenderer3.SetPosition(2, LAss8.transform.localPosition);
lineRenderer3.SetPosition(3, MMid1.transform.localPosition);
lineRenderer4.SetPosition(0, RFoot13.transform.localPosition);
lineRenderer4.SetPosition(1, RKnee12.transform.localPosition);
lineRenderer4.SetPosition(2, RAss11.transform.localPosition);
lineRenderer4.SetPosition(3, MMid1.transform.localPosition);
}
}
(4) 运行结果：
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