如何在不减慢到 0.3 FPS 的情况下移动 500 个刚体立方体？

Question

过去几周我一直在试验 Unity；我还是新人。我稍微涉足 ECS、计算着色器等，但如果由于复杂性而没有必要，我真的不想实现这些解决方案。

默认的 Unity 物理引擎真的不能同时使用刚体处理移动 500 个立方体实例吗？还是我做事的方式对性能特别不利？

这是我正在使用的代码；它只是一个空游戏对象上的一个脚本。实例化 500 个立方体时，它会减慢到 16FPS，然后通过 Rigidbody MoveTowards 一次移动它们时减慢到 0.3 FPS。

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

public class SpawnAndMove : MonoBehaviour
{
    public TargetCube TargetCube;
    public GameObject CubePrefab;
    public Vector3 brickPosition = new Vector3(10, 0, 0);
    GameObject[] objects;
    int moveCubeInstances;

    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(Countdown());
    }

    IEnumerator Countdown()
    {
        yield return new WaitForSeconds(3f);
        for (int i = 0; i < 500; i++)
        {
            var cubeClone = Instantiate(CubePrefab, transform.position + brickPosition, transform.rotation);
            cubeClone.tag = "CubeInstance";
        }

        objects = GameObject.FindGameObjectsWithTag("CubeInstance");

        yield return new WaitForSeconds(3f);
        moveCubeInstances = 1;

        while (moveCubeInstances == 1)
        {
            for (int i = 0; i < 500; i++)
            {
                objects[i].GetComponent<Rigidbody>().transform.position =
                            Vector3.MoveTowards(objects[i].GetComponent<Rigidbody>().transform.position, TargetCube.transform.position, 12f);
            }
            yield return new WaitForFixedUpdate();
        }

        print("exited while loop");
    }
}

感谢您在此提供的任何帮助。

Answer 1

• 您对 FindGameObjectsWithTag 的调用会进行额外搜索，不仅针对新的 500 个对象，还针对该场景中的所有其他对象
• transform 已经是缓存字段并且调用它你不需要做GetComponent<>

• Instantiate 是一个非常困难的操作，最好提前做，甚至可以将它分成每帧几个调用，例如，每个调用 50 个，但绝对不是一帧 500 个，而是使用池化 (https://docs.unity3d.com/Manual/MobileOptimizationPracticalScriptingOptimizations.html)

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  public class SpawnAndMove : MonoBehaviour
  {
      public TargetCube TargetCube;
      public Rigidbody CubePrefab;
      public Vector3 brickPosition = new Vector3(10, 0, 0);
      Rigidbody[] objects;
      int moveCubeInstances;
  
      void Start()
      {
          StartCoroutine(Countdown());
      }
  
      IEnumerator Countdown()
      {
          yield return new WaitForSeconds(3f);
          objects = new Rigidbody[500];
          for (int i = 0 ; i < 500 ; i++)
          {
              Rigidbody cubeClone = Instantiate(CubePrefab, transform.position + brickPosition, transform.rotation);
              cubeClone.tag = "CubeInstance";
              objects[i] = cubeClone;
              if (i % 50 == 0)
              {
                  yield return new WaitForFixedUpdate();
              }
          }
  
          yield return new WaitForSeconds(3f);
          moveCubeInstances = 1;
  
          while (moveCubeInstances == 1)
          {
              for (int i = 0 ; i < 500 ; i++)
              {
                  objects[i].transform.position =
                          Vector3.MoveTowards(objects[i].transform.position, TargetCube.transform.position, 12f);
              }
              yield return new WaitForFixedUpdate();
          }
  
          print("exited while loop");
      }
  }