drecon-unity/Assets/8_Scripts/1_Managers/GizmoManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.VFX;

[ExecuteInEditMode]
public class GizmoManager : MonoBehaviour
{
    public GameObject m_VFX;
	private LineRenderer lineRenderer;

	void Start(){
		lineRenderer = this.GetComponent<LineRenderer>();
        lineRenderer.startWidth = 0.2f;
        lineRenderer.endWidth = 0.2f;
        //lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
        //lineRenderer.material.color = Color.yellow;
	}

	void Update(){
		DrawWireframe(m_VFX);
	}

	void DrawWireframe(GameObject m_Smoke){

		Bounds m_SmokeBounds = m_Smoke.GetComponent<Renderer>().bounds;

		Vector3[] vertices = new Vector3[16];

		// Calculate the vertices of the box
		vertices[0] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.min.y, m_SmokeBounds.min.z);
		vertices[1] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.min.y, m_SmokeBounds.min.z);
		vertices[2] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.min.y, m_SmokeBounds.max.z);
		vertices[3] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.min.y, m_SmokeBounds.max.z);
		vertices[4] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.min.y, m_SmokeBounds.min.z);

		vertices[5] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.max.y, m_SmokeBounds.min.z);
		vertices[6] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.max.y, m_SmokeBounds.min.z);
		vertices[7] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.min.y, m_SmokeBounds.min.z);
		vertices[8] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.max.y, m_SmokeBounds.min.z);

		vertices[9] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.max.y, m_SmokeBounds.max.z);
		vertices[10] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.min.y, m_SmokeBounds.max.z);
		vertices[11] = new Vector3(m_SmokeBounds.max.x, m_SmokeBounds.max.y, m_SmokeBounds.max.z);
		vertices[12] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.max.y, m_SmokeBounds.max.z);
		vertices[13] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.min.y, m_SmokeBounds.max.z);
		vertices[14] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.max.y, m_SmokeBounds.max.z);
		vertices[15] = new Vector3(m_SmokeBounds.min.x, m_SmokeBounds.max.y, m_SmokeBounds.min.z);
		

		lineRenderer.positionCount = vertices.Length;
		lineRenderer.SetPositions(vertices);

	}
}