unity 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

以下是一个简单的示例脚本，可用于检测扇形面的碰撞，并根据遮挡情况进行颜色渲染。请根据您的实际需求进行修改：

using UnityEngine;

public class FanShape : MonoBehaviour
{
    public float angle = 30f;
    public float radius = 5f;
    public Transform target;

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

    private Vector3[] vertices;
    private int[] triangles;

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

        // 生成扇形面的网格
        GenerateMesh();
    }

    private void Update()
    {
        // 检测碰撞，并根据遮挡情况设置材质颜色
        CheckCollision();
    }

    private void GenerateMesh()
    {
        // 生成扇形面的顶点和三角形
        int segments = Mathf.CeilToInt(angle / 2);
        int vertexCount = segments + 1;
        vertices = new Vector3[vertexCount];
        triangles = new int[segments * 3];

        vertices[0] = Vector3.zero;
        for (int i = 0; i < segments; i++)
        {
            float radian = Mathf.Deg2Rad * (i + 1) * (angle / segments);
            vertices[i + 1] = new Vector3(Mathf.Cos(radian), 0f, Mathf.Sin(radian)) * radius;

            if (i == segments - 1)
            {
                triangles[i * 3] = 0;
                triangles[i * 3 + 1] = i + 1;
                triangles[i * 3 + 2] = 1;
            }
            else
            {
                triangles[i * 3] = 0;
                triangles[i * 3 + 1] = i + 1;
                triangles[i * 3 + 2] = i + 2;
            }
        }

        // 创建网格并设置材质
        Mesh mesh = new Mesh();
        mesh.vertices = vertices;
        mesh.triangles = triangles;
        mesh.RecalculateNormals();
        meshFilter.mesh = mesh;
        meshCollider.sharedMesh = mesh;

        Material material = new Material(Shader.Find("Standard"));
        meshRenderer.material = material;
    }

    private void CheckCollision()
    {
        // 检测扇形面是否与目标物体发生碰撞
        RaycastHit hitInfo;
        Vector3 direction = target.position - transform.position;
        if (Physics.Raycast(transform.position, direction, out hitInfo, radius))
        {
            // 计算碰撞点在扇形面上的位置
            Vector3 hitPoint = hitInfo.point - transform.position;
            float angleRad = Mathf.Atan2(hitPoint.z, hitPoint.x);
            float angleDeg = angleRad * Mathf.Rad2Deg;
            if (angleDeg < 0f) angleDeg += 360f;
            int index = Mathf.FloorToInt(angleDeg / (angle / 2));

            // 根据遮挡情况设置材质颜色
            Color color = Color.red;
            if (index == 0 || index == vertices.Length - 1)
            {
                color = Color.green;
            }
            else
            {
                Vector3 vertex1 = vertices[index];
                Vector3 vertex2 = vertices[index + 1];
                Vector3 hitDir = hitPoint.normalized;
                Vector3 vertex1Dir = vertex1.normalized;
                Vector3 vertex2Dir = vertex2.normalized;
                if (Vector3.Dot(hitDir, vertex1Dir) >= 0f && Vector3.Dot(hitDir, vertex2Dir) >= 0f)
                {
                    color = Color.green;
                }
            }

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

需要注意的是，以上脚本中的检测碰撞的方式是使用Physics.Raycast()方法，该方法只能检测到扇形面上距离起点最近的一个碰撞点，如果目标物体在扇形面上有多个碰撞点，则只会检测到距离起点最近的那个点。如果需要检测所有的碰撞点，或者需要检测更复杂的碰撞情况，可以使用Physics.SphereCast()方法或者其他物理引擎相关的方法。