unity 在已生成的扇形面添加检测，由顶点向弧线检测遮挡，可检测到部分显示绿色，遮挡部分显示红色，具体脚本

以下是一个示例脚本，可以向扇形面添加检测，检测遮挡情况并将遮挡部分的颜色标记为红色：

using UnityEngine;

public class SectorDetector : MonoBehaviour
{
    public float radius;
    public float angle;
    public LayerMask layerMask;

    private MeshFilter meshFilter;
    private MeshCollider meshCollider;
    private MeshRenderer meshRenderer;
    private Mesh mesh;

    private void Awake()
    {
        meshFilter = GetComponent<MeshFilter>();
        meshCollider = GetComponent<MeshCollider>();
        meshRenderer = GetComponent<MeshRenderer>();

        GenerateMesh();
    }

    private void GenerateMesh()
    {
        mesh = new Mesh();

        int segments = 16;
        Vector3[] vertices = new Vector3[segments + 2];
        int[] triangles = new int[segments * 3];

        float angleRad = angle * Mathf.Deg2Rad;
        float angleStep = angleRad / segments;

        vertices[0] = Vector3.zero;
        for (int i = 1; i <= segments + 1; i++)
        {
            float x = radius * Mathf.Cos(angleRad / 2 - i * angleStep);
            float z = radius * Mathf.Sin(angleRad / 2 - i * angleStep);
            vertices[i] = new Vector3(x, 0f, z);
        }

        for (int i = 0; i < segments; i++)
        {
            triangles[i * 3] = 0;
            triangles[i * 3 + 1] = i + 1;
            triangles[i * 3 + 2] = i + 2;
        }

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

        mesh.RecalculateNormals();
        mesh.RecalculateBounds();

        meshFilter.mesh = mesh;
        meshCollider.sharedMesh = mesh;
    }

    private void Update()
    {
        Vector3[] vertices = mesh.vertices;
        int[] triangles = mesh.triangles;

        for (int i = 0; i < triangles.Length; i += 3)
        {
            Vector3 v1 = transform.TransformPoint(vertices[triangles[i]]);
            Vector3 v2 = transform.TransformPoint(vertices[triangles[i + 1]]);
            Vector3 v3 = transform.TransformPoint(vertices[triangles[i + 2]]);

            Vector3 center = (v1 + v2 + v3) / 3f;
            Vector3 direction = center - transform.position;

            RaycastHit hit;
            if (Physics.Raycast(transform.position, direction, out hit, radius, layerMask))
            {
                meshRenderer.material.color = Color.red;
                return;
            }
        }

        meshRenderer.material.color = Color.green;
    }
}

在这个脚本中，我们使用 `Mesh` 类生成一个由多个三角形组成的扇形面，然后遍历每个三角形的中心点向扇形面中心发射一条射线，检测到遮挡时将扇形面的颜色标记为红色，否则为绿色。可以通过调整 `radius` 和 `angle` 参数来控制扇形面的大小和张角。同时，可以通过将需要检测的物体的 `Layer` 设置为 `layerMask` 中的一个或多个层来控制检测的目标物体。