[Unity]如何在3D中绘制环线

using UnityEngine;

[RequireComponent(typeof(MeshFilter), typeof(MeshRenderer))]
public class RingGenerator : MonoBehaviour
{
    public float innerRadius = 1f; // 内半径
    public float outerRadius = 2f; // 外半径
    public int segments = 30; // 环线的分段数

    private Mesh ringMesh;

    private void Awake()
    {
        ringMesh = new Mesh();
        GetComponent<MeshFilter>().mesh = ringMesh;
    }

    private void Start()
    {
        GenerateRing();
    }

    private void GenerateRing()
    {
        Vector3[] vertices = new Vector3[segments * 2];
        int[] triangles = new int[segments * 6];

        float angleStep = 360f / segments;
        float currentAngle = 0f;

        for (int i = 0; i < segments; i++)
        {
            float radian = Mathf.Deg2Rad * currentAngle;
            float x = Mathf.Cos(radian);
            float z = Mathf.Sin(radian);

            vertices[i * 2] = new Vector3(x * innerRadius, 0f, z * innerRadius);
            vertices[i * 2 + 1] = new Vector3(x * outerRadius, 0f, z * outerRadius);

            triangles[i * 6] = i * 2;
            triangles[i * 6 + 1] = i * 2 + 1;
            triangles[i * 6 + 2] = (i * 2 + 2) % (segments * 2);

            triangles[i * 6 + 3] = (i * 2 + 2) % (segments * 2);
            triangles[i * 6 + 4] = (i * 2 + 1) % (segments * 2);
            triangles[i * 6 + 5] = (i * 2 + 3) % (segments * 2);

            currentAngle += angleStep;
        }

        ringMesh.vertices = vertices;
        ringMesh.triangles = triangles;
        ringMesh.RecalculateNormals();
    }
}