How to draw multiple circles by using "LineRenderer" - unity3d

Question

There is a code for a drawing circle with LineRenderer.
but I want to draw multiple circles with different radius, I used "for loop" but there is one circle instead of multiple
public float ThetaScale = 0.01f;
public float radius = 3f;
private int Size;
private LineRenderer LineDrawer;
private float Theta = 0f;
void Start ()
{
LineDrawer = GetComponent<LineRenderer>();
}
void Update ()
{
Theta = 0f;
Size = (int)((1f / ThetaScale) + 1f);
LineDrawer.SetVertexCount(Size);
for (int l = 0; l < 5; l++)
{
for(int i = 0; i < Size; i++)
{
Theta += (2.0f * Mathf.PI * ThetaScale);
float x = l * radius * Mathf.Cos(Theta);
float y = l * radius * Mathf.Sin(Theta);
LineDrawer.SetPosition(i, new Vector3(x, 0, y));
}
}
}

Answer 1

In every loop you always overwrite the same positions indices in the same line renderer. So you will always only have the last circle.
Note that it is also quite expensive to use SetPoisition repeatedly. As it says in the API you should rather work on an array and then use SetPoisitions to assign all positions at once.
One thing is a bit unclear though: If you use one single LineRenderer you won't get independent circles but they will always be connected at some point. Otherwise you would need 5 separated LineRenderer instances.
Option A: 5 circles but connected to each other since part of a single LineRenderer
void Start ()
{
LineDrawer = GetComponent<LineRenderer>();
LineDrawer.loop = false;
Theta = 0f;
// Use one position more to close the circle
Size = (int)((1f / ThetaScale) + 1f) + 1;
LineDrawer.positionCount = 5 * Size;
var positions = new Vector3[5 * Size];
for (int l = 0; l < 5; l++)
{
for(int i = 0; i < Size; i++)
{
Theta += (2.0f * Mathf.PI * ThetaScale);
float x = l * radius * Mathf.Cos(Theta);
float y = l * radius * Mathf.Sin(Theta);
positions[5 * l + i] = new Vector3(x, 0, y);
}
}
LineDrawer.SetPositions(positions);
}
Option B: 5 separated circles in 5 separated LineRenderers
// Drag 5 individual LineRenderer here via the Inspector
public LineRenderer[] lines = new LineRenderer[5];
void Start ()
{
foreach(var line in lines)
{
line.loop = true;
Theta = 0f;
Size = (int)((1f / ThetaScale) + 1f);
line.positionCount = Size;
var positions = new Vector3[Size];
for(int i = 0; i < Size; i++)
{
Theta += (2.0f * Mathf.PI * ThetaScale);
float x = l * radius * Mathf.Cos(Theta);
float y = l * radius * Mathf.Sin(Theta);
positions[5 * l + i] = new Vector3(x, 0, y);
}
line.SetPositions(positions);
}
}

Answer 2

You missed few details here and there. Here, this will work:
using UnityEngine;
[ExecuteAlways]
[RequireComponent( typeof(LineRenderer) )]
public class CircularBehaviour : MonoBehaviour
{
[SerializeField][Min(3)] int _numSegments = 16;
[SerializeField][Min(1)] int _numCircles = 5;
[SerializeField] float _radius = 3f;
LineRenderer _lineRenderer;
void Awake ()
{
_lineRenderer = GetComponent<LineRenderer>();
_lineRenderer.loop = false;
_lineRenderer.useWorldSpace = false;
}
void Update ()
{
const float TAU = 2f * Mathf.PI;
float theta = TAU / (float)_numSegments;
int numVertices = _numSegments + 1;
_lineRenderer.positionCount = numVertices * _numCircles;
int vert = 0;
for( int l=1 ; l<=_numCircles ; l++ )
{
float r = _radius * (float)l;
for( int i=0 ; i<numVertices ; i++ )
{
float f = theta * (float)i;
Vector3 v = new Vector3{ x=Mathf.Cos(f) , y=Mathf.Sin(f) } * r;
_lineRenderer.SetPosition( vert++ , v );
}
}
}
}
But
as #derHugo explained, this is not what you're looking for exactly as all circles will be drawn connected.