unity3d中,如何使用柏林噪音算法在有限地形中生成动态随机物体.

Question

现有固定大小地形中随机动态效果(图1). 想要将移动的波浪变为多数单个物体(如长方体,且地形平坦.图2)

现有地形代码 Terrain Generator

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

public class TerrainGenerator : MonoBehaviour
{
    public int depth = 20;

    public int width = 256;
    public int height = 256;

    public float scale = 20f;

    public float offsetX = 200f;
    public float offsetY = 200f;

    public float velocity = 5f;

    private void Start()
    {
        offsetX = Random.Range(0f, 99999f);
        offsetY = Random.Range(0f, 99999f);
    }
    // Start is called before the first frame update
    void Update()
    {
        Terrain terrain = GetComponent<Terrain>();
        terrain.terrainData = GenerateTerrain(terrain.terrainData);
        
        offsetX += velocity * Time.deltaTime;
    }

    TerrainData GenerateTerrain(TerrainData terrainData)
    {
        terrainData.heightmapResolution = width + 1;

        terrainData.size = new Vector3(width, depth, height);
        terrainData.SetHeights(0, 0, GenerateHeights());

        return terrainData;
    }

    float[,] GenerateHeights()
    {
        float[,] heights = new float[width, height];
        for (int x = 0; x < width; x++)
        {
            for (int y = 0; y < height; y++)
            {
                heights[x, y] = CalculateHeight(x, y);
            }
        }

        return heights;
    }

    float CalculateHeight(int x, int y)
    {
        float xCoord = (float)x / width * scale + offsetX;
        float yCoord = (float)y / height * scale + offsetY;

        return Mathf.PerlinNoise(xCoord, yCoord);
    }
}

Answer 1

基础逻辑:

1. 每秒生成一个长方体（时间根据timer控制）
2. 随机物体大小（最大大小根据depth，width，height）
3. 控制生成物体向前运动（速度根据velocity控制）

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

public class CubeGenerator : MonoBehaviour
{
    // 长方体长宽高 最大值
    public int depth = 20;
    public int width = 256;
    public int height = 256;
    
    // 控制移动速度
    public float velocity = 5f;

    //public float offsetX = 200f;
    //public float offsetY = 200f;
    
    // 间隔过长时间生成物体
    private float timer = 1f;
    private float time = 0f;
    
    // 生成物体集合
    List<Transform> cubeList = new List<Transform>();
    
    private void Start()
    {
        //offsetX = Random.Range(0f, 99999f);
        //offsetY = Random.Range(0f, 99999f);
    }
    
    void Update()
    {
        time += Time.deltaTime;
        // 满足条件生成物体
        //if (Input.GetKeyDown(KeyCode.A))
        // 每秒生成一个物体
        if(time - timer >= 0)
        {
            Transform terrain = CreateCube();
            cubeList.Add(terrain);
            time = 0;
        }
        
        // 物体移动
        for (int i = 0; i < cubeList.Count; i++)
        {
            cubeList[i].Translate(Vector3.forward * velocity * Time.deltaTime);
        }
    }
    
    // 创建物体
    Transform CreateCube()
    {
        // 创建Cube
        Transform cubeTrans = GameObject.CreatePrimitive(PrimitiveType.Cube).transform;
        //Instantiate(gameobjectPrefabs);
        cubeTrans.localPosition = Vector3.zero;
        // 随机大小
        cubeTrans.localScale = new Vector3(Random.Range(0.1f, width), Random.Range(0.1f, depth), Random.Range(0.1f, height));
        return cubeTrans;
    }
}