Unity-太阳系

Homework_2

Solar System

简答

1. 游戏对象运动的本质是什么？

   游戏对象坐标的变换

编程

1. 请用三种方法以上方法，实现物体的抛物线运动。

   1. 修改 transform 属性

      private float origin = Time.deltaTime;
      private bool flag = true;
      
      // Update is called once per frame
      void Update () {
          if (flag) {
              if (origin - 100 * Time.deltaTime < 0.00001) {
                  transform.position += Vector3.down * Time.deltaTime;
                  transform.position += Vector3.right * Time.deltaTime;
              } else if (origin - 200 * Time.deltaTime < 0.00001) {
                  transform.position += Vector3.up * Time.deltaTime;
                  transform.position += Vector3.right * Time.deltaTime;
              } else {
                  flag = false;
              }
              origin += Time.deltaTime;
          } else {
              if (origin - 100 * Time.deltaTime > 0.00001) { 
                  transform.position += Vector3.down * Time.deltaTime;
                  transform.position += Vector3.left * Time.deltaTime;
              } else if (origin > 0.00001) {
                  transform.position += Vector3.up * Time.deltaTime;
                  transform.position += Vector3.left * Time.deltaTime;
              } else {
                  flag = true;
              }
              origin -= Time.deltaTime;
          }
      }

   2. transform.Translate

      // Update is called once per frame
      void Update () {
          if (flag) {
              if (origin - 100 * Time.deltaTime < 0.00001) {
                  Vector3 target = Vector3.right * Time.deltaTime + Vector3.down * Time.deltaTime;
                  transform.Translate(target, Space.World);
              } else if (origin - 200 * Time.deltaTime < 0.00001) {
                  Vector3 target = Vector3.right * Time.deltaTime + Vector3.up * Time.deltaTime;
                  transform.Translate(target, Space.World);
              } else {
                  flag = false;
              }
              origin += Time.deltaTime;
          } else { /*backward*/ }
      }

   3. Vector3.MoveTowards

      private float step = Time.deltaTime;
      
      // Update is called once per frame
      void Update () {
          float step = Time.deltaTime;
          if (flag) {
              if (origin - 100 * Time.deltaTime < 0.00001) {
                  Vector3 target = transform.position + Vector3.right * Time.deltaTime + Vector3.down * Time.deltaTime;
                  transform.position = Vector3.MoveTowards(transform.position, target, step);
              } else if (origin - 200 * Time.deltaTime < 0.00001) {
                  Vector3 target = transform.position + Vector3.right * Time.deltaTime + Vector3.up * Time.deltaTime;
                  transform.position = Vector3.MoveTowards(transform.position, target, step);
              } else {
                  flag = false;
              }
              origin += Time.deltaTime;
          } else { /*backward*/ }
      }

   4. Vector3.Lerp

      void Update {
          if (flag) {
            if (origin - 100 * Time.deltaTime < 0.00001) {
                Vector3 target = transform.position + Vector3.right * Time.deltaTime + Vector3.down * Time.deltaTime;
                transform.position = Vector3.Lerp(transform.position, target, 1);
            } else if (origin - 200 * Time.deltaTime < 0.00001) {
                Vector3 target = transform.position + Vector3.right * Time.deltaTime + Vector3.up * Time.deltaTime;
                transform.position = Vector3.Lerp(transform.position, target, 1);
            } else {
                flag = false;
            }
            origin += Time.deltaTime;
        } else { /*backward*/ }
      }

2. 写一个程序，实现一个完整的太阳系，其他星球围绕太阳的转速必须不一样，且不在一个法平面上。

   思路:首先创建确定行星和太阳位置的脚本文件，然后给出行星公转的脚本。
   
   位置脚本:
   
       
   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   
   public class SolarSystem : MonoBehaviour {
       public Transform Sun;
       public Transform Mercury;
       public Transform Venus;
       public Transform Earth;
       public Transform EarthShadow;
       public Transform Moon;
       public Transform Mars;
       public Transform Jupiter;
       public Transform Saturn;
       public Transform Uranus;
       public Transform Neptune;
   
       // Use this for initialization
       void Start () {
           Sun.position = Vector3.zero;
           Mercury.position = new Vector3(4, 0, 0);
           Venus.position = new Vector3(5, 0, 0);
           Earth.position = new Vector3(7, 0, 0);
           Moon.position = new Vector3(7.4f, 0, 0.4f);
           Mars.position = new Vector3(9, 0, 0);
           Jupiter.position = new Vector3(12, 0, 0);
           Saturn.position = new Vector3(16, 0, 0);
           Uranus.position = new Vector3(19, 0, 0);
           Neptune.position = new Vector3(21, 0, 0);
           EarthShadow.position = Earth.position;
       }
   }
   
   公转脚本(其中，r_x 和 r_y 随机数为实现不同法平面)：
   
       
   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   
   public class Rotate : MonoBehaviour {
       public Transform source;
       public float step;
       private float r_x;
       private float r_y;
   
       // Use this for initialization
       void Start () {
           r_x = Random.Range(0, 0.3f);
           r_y = Random.Range(0, 0.3f);
           while (r_y == 0) {
               r_y = Random.Range(-1, 1);
           }
       }
   
       // Update is called once per frame
       void Update () {
           Vector3 axis;
           if (source.ToString() == "EarthShadow") {
               axis = new Vector3(0, 1, 0);
           } else {
               axis = new Vector3(r_x, r_y, 0);
           }
           transform.RotateAround(source.position, axis, step * Time.deltaTime);
       }
   }
   
       *课件中提出月球绕地球公转是地球子对象，但又不应受地球自转影响而不是其子对象的问题。参考解决方案，给出了月球作为 EarthShadow 空对象的解决方案。注意让 EarthShadow 的位置每时每刻跟随地球即可。*