unity 通过代码生成 半球体mesh

可以使用以下代码生成半球体mesh：

using UnityEngine;

public class HalfSphereMeshGenerator : MonoBehaviour
{
    public int segments = 10;
    public float radius = 1f;

    private MeshFilter meshFilter;

    private void Awake()
    {
        meshFilter = GetComponent<MeshFilter>();
        meshFilter.mesh = GenerateHalfSphereMesh();
    }

    private Mesh GenerateHalfSphereMesh()
    {
        Mesh mesh = new Mesh();

        int verticesCount = (segments + 1) * (segments + 1) / 2;
        Vector3[] vertices = new Vector3[verticesCount];
        Vector2[] uv = new Vector2[verticesCount];
        int[] triangles = new int[segments * segments * 6];

        int vertexIndex = 0;
        int triangleIndex = 0;

        for (int y = 0; y <= segments; y++)
        {
            for (int x = 0; x <= segments - y; x++)
            {
                float u = (float)x / segments;
                float v = (float)y / segments;
                float theta = u * Mathf.PI * 2f;
                float phi = v * Mathf.PI / 2f;

                float xPosition = Mathf.Cos(theta) * Mathf.Sin(phi) * radius;
                float yPosition = Mathf.Cos(phi) * radius;
                float zPosition = Mathf.Sin(theta) * Mathf.Sin(phi) * radius;

                vertices[vertexIndex] = new Vector3(xPosition, yPosition, zPosition);
                uv[vertexIndex] = new Vector2(u, v);

                if (x < segments - y && y < segments)
                {
                    triangles[triangleIndex] = vertexIndex;
                    triangles[triangleIndex + 1] = vertexIndex + segments - y + 1;
                    triangles[triangleIndex + 2] = vertexIndex + segments - y;

                    triangles[triangleIndex + 3] = vertexIndex;
                    triangles[triangleIndex + 4] = vertexIndex + 1;
                    triangles[triangleIndex + 5] = vertexIndex + segments - y + 1;

                    triangleIndex += 6;
                }

                vertexIndex++;
            }
        }

        mesh.vertices = vertices;
        mesh.uv = uv;
        mesh.triangles = triangles;

        mesh.RecalculateNormals();

        return mesh;
    }
}

这个脚本可以将一个半球体mesh生成并赋值给一个MeshFilter组件。可以通过调整segments和radius参数来控制半球体的细节和大小。