XiuXianGame/Assets/Art/GenerateCloudPlane.cs

using UnityEngine;

[ExecuteInEditMode] // 编辑器下也能直接运行
public class CloudPlaneGenerator : MonoBehaviour
{
    [Header("细分度（推荐 80~150，手机别超200）")]
    public int subdivisions = 120;

    [Header("平面大小（世界单位）")]
    public float size = 200f; // 最终平面宽高 200×200 米

    [Header("一键生成（Play模式或编辑器都行）")]
    public bool generateNow = false;

    private void Update()
    {
        if (generateNow)
        {
            generateNow = false; // 防止连续生成
            Generate();
        }
    }

    [ContextMenu("手动生成云海平面")] // 右键组件 → 手动生成云海平面
    public void Generate()
    {
        // 确保有组件
        var filter = GetComponent<MeshFilter>();
        if (filter == null) filter = gameObject.AddComponent<MeshFilter>();
        var renderer = GetComponent<MeshRenderer>();
        if (renderer == null) renderer = gameObject.AddComponent<MeshRenderer>();

        Mesh mesh = new Mesh();
        mesh.name = "CloudSea_Plane";

        int vertsX = subdivisions + 1;
        int vertsZ = subdivisions + 1;

        Vector3[] vertices = new Vector3[vertsX * vertsZ];
        Vector2[] uv = new Vector2[vertsX * vertsZ];
        int[] triangles = new int[subdivisions * subdivisions * 6];

        float uvStep = 1f / subdivisions;
        float posStep = size / subdivisions;

        for (int z = 0; z < vertsZ; z++)
        {
            for (int x = 0; x < vertsX; x++)
            {
                int i = x + z * vertsX;

                // 位置：从 -size/2 到 +size/2
                vertices[i] = new Vector3(
                    x * posStep - size * 0.5f,
                    0,
                    z * posStep - size * 0.5f
                );

                // UV 仍然是 0~1，方便后面 Tiling 参数控制
                uv[i] = new Vector2(x * uvStep, z * uvStep);
            }
        }

        // 生成三角形
        int tri = 0;
        for (int z = 0; z < subdivisions; z++)
        {
            for (int x = 0; x < subdivisions; x++)
            {
                int i = x + z * vertsX;

                triangles[tri++] = i;
                triangles[tri++] = i + vertsX;
                triangles[tri++] = i + 1;

                triangles[tri++] = i + 1;
                triangles[tri++] = i + vertsX;
                triangles[tri++] = i + vertsX + 1;
            }
        }

        mesh.vertices = vertices;
        mesh.uv = uv;
        mesh.triangles = triangles;
        mesh.RecalculateNormals();
        mesh.RecalculateBounds();

        filter.sharedMesh = mesh;

        // 自动放大（很多人忘记这一步！）
        transform.localScale = Vector3.one;

        // 如果没有材质，给一个默认的防止粉红
        if (renderer.sharedMaterial == null)
        {
            renderer.sharedMaterial = new Material(Shader.Find("Universal Render Pipeline/Unlit"));
        }

        Debug.Log($"云海平面生成完成！顶点数：{vertices.Length}  三角形：{triangles.Length / 3}");
    }
}