如何使用 linerenderer 绘制一个圆圈并将其作为 object 的子 object 的圆圈应该画出来？

Question

When I attach this script to an object it will draw a circle around it. Now I want to make that the script the linerenderer will be attached to empty gameobject that will be a child of the object that it will draw the circle around.

I want that so I can drag the empty gameobject and change the circle height. That way I can simple duplicate the empty gameobject and have two circles one on ground on higher. and both circle will be the same radius around the parent object the parent object will be the center.

using UnityEngine;
using System.Collections;
using System;

[ExecuteAlways]
[RequireComponent(typeof(LineRenderer))]
public class DrawRadiusAroundTurret : MonoBehaviour
{
    [Range(1, 50)] public int segments = 50;
    [Range(1, 5)] public float xRadius = 5;
    [Range(1, 5)] public float yRadius = 5;
    [Range(0.1f, 5f)] public float width = 0.1f;
    public bool controlBothXradiusYradius = false;
    public bool draw = true;

    [SerializeField] private LineRenderer line;

    private void Start()
    {
        if (!line) line = GetComponent<LineRenderer>();

        CreatePoints();
    }

    public void CreatePoints()
    {
        line.enabled = true;
        line.widthMultiplier = width;
        line.useWorldSpace = false;
        line.widthMultiplier = width;
        line.positionCount = segments + 1;

        float x;
        float y;

        var angle = 20f;
        var points = new Vector3[segments + 1];
        for (int i = 0; i < segments + 1; i++)
        {
            x = Mathf.Sin(Mathf.Deg2Rad * angle) * xRadius;
            y = Mathf.Cos(Mathf.Deg2Rad * angle) * yRadius;

            points[i] = new Vector3(x, 0f, y);

            angle += (380f / segments);
        }

        // it's way more efficient to do this in one go!
        line.SetPositions(points);
    }

#if UNITY_EDITOR
    private float prevXRadius, prevYRadius;
    private int prevSegments;
    private float prevWidth;

    private void OnValidate()
    {
        // Can't set up our line if the user hasn't connected it yet.
        if (!line) line = GetComponent<LineRenderer>();
        if (!line) return;

        if (!draw)
        {
            // instead simply disable the component
            line.enabled = false;
        }
        else
        {
            // Otherwise re-enable the component
            // This will simply re-use the previously created points
            line.enabled = true;

            if (xRadius != prevXRadius || yRadius != prevYRadius || segments != prevSegments || width != prevWidth)
            {
                CreatePoints();

                // Cache our most recently used values.
                prevXRadius = xRadius;
                prevYRadius = yRadius;
                prevSegments = segments;
                prevWidth = width;
            }

            if (controlBothXradiusYradius)
            {
                yRadius = xRadius;
            }
        }
    }
#endif
}

The main goal is to have multiple circles around the Missles Turrent but that I will be able to change the circles height with a simple drag.

Answer 1

The solution is to create empty gameobject/s as children each child position set to 0,0,0 Then adding to each child a linerenderer component and the script.

The script:

using UnityEngine;
using System.Collections;
using System;

[ExecuteAlways]
[RequireComponent(typeof(LineRenderer))]
public class DrawRadiusAroundTurret : MonoBehaviour
{
    [Range(1, 50)] public int segments = 50;
    [Range(1, 5)] public float xRadius = 5;
    [Range(1, 5)] public float yRadius = 5;
    [Range(0.1f, 5f)] public float width = 0.1f;
    public bool controlBothXradiusYradius = false;
    public bool draw = true;

    [SerializeField] private LineRenderer line;

    private void Start()
    {
        if (!line) line = GetComponent<LineRenderer>();

        CreatePoints();
    }

    //private void Update()
    //{
    //    
    //}

    public void CreatePoints()
    {
        line.enabled = true;
        line.widthMultiplier = width;
        line.useWorldSpace = false;
        line.widthMultiplier = width;
        line.positionCount = segments + 1;

        float x;
        float y;

        var angle = 20f;
        var points = new Vector3[segments + 1];
        for (int i = 0; i < segments + 1; i++)
        {
            x = Mathf.Sin(Mathf.Deg2Rad * angle) * xRadius;
            y = Mathf.Cos(Mathf.Deg2Rad * angle) * yRadius;

            points[i] = new Vector3(x, 0f, y);

            angle += (380f / segments);
        }

        // it's way more efficient to do this in one go!
        line.SetPositions(points);
    }

#if UNITY_EDITOR
    private float prevXRadius, prevYRadius;
    private int prevSegments;
    private float prevWidth;

    private void OnValidate()
    {
        // Can't set up our line if the user hasn't connected it yet.
        if (!line) line = GetComponent<LineRenderer>();
        if (!line) return;

        if (!draw)
        {
            // instead simply disable the component
            line.enabled = false;
        }
        else
        {
            // Otherwise re-enable the component
            // This will simply re-use the previously created points
            line.enabled = true;

            if (xRadius != prevXRadius || yRadius != prevYRadius || segments != prevSegments || width != prevWidth)
            {
                CreatePoints();

                // Cache our most recently used values.
                prevXRadius = xRadius;
                prevYRadius = yRadius;
                prevSegments = segments;
                prevWidth = width;
            }

            if (controlBothXradiusYradius)
            {
                yRadius = xRadius;
            }
        }
    }
#endif
}

Screenshot: