c# - 如何在不减慢至 0.3 FPS 的情况下移动 500 个 Rigidbody 立方体？

Question

过去几周我一直在尝试 Unity；我还是个新人。我稍微深入研究了 ECS、计算着色器等，但如果没有必要，由于复杂性，我真的不想实现这些解决方案。

默认的 Unity 物理引擎真的无法处理使用 RigidBodies 一次性移动 500 个立方体实例吗？或者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，速度减慢至 16FPS；通过 Rigidbody MoveTowards 一次性移动它们时，速度减慢至 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");
    }
}

感谢您在这里提供的任何帮助。

Answer 1

• 您调用 FindGameObjectsWithTag进行额外的搜索，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已经缓存的字段，要调用它，您不需要执行 GetComponent<>

• Instantiate是一个非常困难的操作，最好提前完成，甚至可以将其分成每帧多次调用，例如每次 50 个，但绝对不是一帧 500 个，而是使用 Pooling ( 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");
      }
  }