Added a collider to every line.

Assets/Prefabs.meta

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Assets/Prefabs/PathCollider.prefab

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+  m_IsTrigger: 0
+  m_Enabled: 1
+  m_Radius: 0.5
+  m_Height: 2
+  m_Direction: 1
+  m_Center: {x: 0, y: 0, z: 0}

Assets/Prefabs/PathCollider.prefab.meta

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Assets/Scenes/SampleScene.unity

@@ -211,7 +211,7 @@ Transform:
   m_LocalScale: {x: 17.44, y: 17.44, z: 17.44}
   m_Children: []
   m_Father: {fileID: 0}
-  m_RootOrder: 0
+  m_RootOrder: 3
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1 &519420028
 GameObject:
@@ -360,7 +360,7 @@ Transform:
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 0}
-  m_RootOrder: 3
+  m_RootOrder: 2
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1 &818789540
 GameObject:
@@ -393,7 +393,8 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   square: {fileID: 1577789449}
-  PathCollider: {fileID: 1059381751}
+  PathColliderPrefab: {fileID: 8684657376034186961, guid: bf9de3c1290fd0749b383f44c1e706f8,
+    type: 3}
 --- !u!120 &818789542
 LineRenderer:
   m_ObjectHideFlags: 0
@@ -409,7 +410,7 @@ LineRenderer:
   m_LightProbeUsage: 0
   m_ReflectionProbeUsage: 0
   m_RenderingLayerMask: 1
-  m_RendererPriority: 0
+  m_RendererPriority: 1
   m_Materials:
   - {fileID: 2100000, guid: 695981ce54564b0439a7358d033eb87c, type: 2}
   m_StaticBatchInfo:
@@ -436,7 +437,7 @@ LineRenderer:
   - {x: 0, y: 0, z: 1}
   m_Parameters:
     serializedVersion: 3
-    widthMultiplier: 1
+    widthMultiplier: 1.5
     widthCurve:
       serializedVersion: 2
       m_Curve:
@@ -497,103 +498,11 @@ Transform:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 818789540}
   m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
-  m_LocalPosition: {x: 0, y: 0, z: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 0}
-  m_RootOrder: 2
-  m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
---- !u!1 &1059381751
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-  - component: {fileID: 1059381754}
-  - component: {fileID: 1059381753}
-  - component: {fileID: 1059381752}
-  m_Layer: 0
-  m_Name: PathCollider
-  m_TagString: Untagged
-  m_Icon: {fileID: 0}
-  m_NavMeshLayer: 0
-  m_StaticEditorFlags: 0
-  m_IsActive: 1
---- !u!136 &1059381752
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-  m_Height: 2
-  m_Direction: 1
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---- !u!23 &1059381753
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-  m_GameObject: {fileID: 1059381751}
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-  m_LightProbeUsage: 1
-  m_ReflectionProbeUsage: 1
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-  m_RendererPriority: 0
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-  m_AutoUVMaxAngle: 89
-  m_LightmapParameters: {fileID: 0}
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-  m_SortingOrder: 0
---- !u!33 &1059381754
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-  m_Mesh: {fileID: 10208, guid: 0000000000000000e000000000000000, type: 0}
---- !u!4 &1059381755
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-  m_LocalScale: {x: 2, y: 0.5, z: 0}
-  m_Children: []
-  m_Father: {fileID: 0}
-  m_RootOrder: 4
+  m_RootOrder: 1
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
 --- !u!1 &1577789448
 GameObject:
@@ -691,5 +600,5 @@ Transform:
   m_Children:
   - {fileID: 519420032}
   m_Father: {fileID: 0}
-  m_RootOrder: 1
+  m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}

Assets/Scripts/PathRenderer.cs

@@ -9,15 +9,14 @@ public class PathRenderer : MonoBehaviour
     [SerializeField]
     Square square;
     [SerializeField]
-    GameObject PathCollider;
+    GameObject PathColliderPrefab;
 
     LineRenderer _pathRenderer;
-    float _zPosition => square.transform.position.z;
     float _originalPathColliderY;
     // Start is called before the first frame update
     void Start()
     {
-        _originalPathColliderY = PathCollider.transform.localScale.y;
+        _originalPathColliderY = PathColliderPrefab.transform.localScale.y;
 
         _pathRenderer = GetComponent<LineRenderer>();
         _ResetPaths();
@@ -35,7 +34,6 @@ public class PathRenderer : MonoBehaviour
             {
                 if (Input.GetKey(KeyCode.LeftShift))
                 {
-                    Debug.Log("asdf");
                     _DrawMorePath(hit.point);
                 }
                 else
@@ -60,11 +58,10 @@ public class PathRenderer : MonoBehaviour
     private void _DrawOnePath(Vector3 point)
     {
         _ResetPaths();
-        point.z = _zPosition;
         square.pathList[0] = transform.position;
         square.pathList[1] = point;
         _pathRenderer.SetPositions(square.pathList.ToArray());
-        _modifyCapsule();
+        _InstantiatePathCollider(0);
     }
 
     private void _ResetPaths()
@@ -72,30 +69,34 @@ public class PathRenderer : MonoBehaviour
         _pathRenderer.positionCount = 2;
         square.pathList.Clear();
         square.pathList.Add(transform.position);
-        square.pathList.Add(new Vector3(0, 0, _zPosition));
+        square.pathList.Add(new Vector3(0, 0, 0));
         _pathRenderer.SetPositions(square.pathList.ToArray());
+        for (int i = 0; i < transform.childCount; i++)
+            Destroy(transform.GetChild(i).gameObject);
     }
 
     private void _DrawMorePath(Vector3 point)
     {
-        point.z = _zPosition;
         square.pathList.Add(point);
         _pathRenderer.positionCount = square.pathList.Count();
         _pathRenderer.SetPositions(square.pathList.ToArray());
+        _InstantiatePathCollider(square.pathList.Count() - 2);
     }
 
-    private void _modifyCapsule()
+    private void _InstantiatePathCollider(int n)
     {
-        PathCollider.transform.localScale = new Vector3(2, _originalPathColliderY, 0);
-        PathCollider.transform.eulerAngles = new Vector3(0, 0,
+        var _pathCollider = Instantiate(PathColliderPrefab, transform);
+        _pathCollider.name = "PathCollider-" + n;
+        _pathCollider.transform.localScale = new Vector3(2, _originalPathColliderY, 0);
+        _pathCollider.transform.eulerAngles = new Vector3(0, 0,
             (float)Constants.RadianToDegree(Mathf.PI / 2 +
                 Mathf.Atan
                 (square.GetTangent(
-                    square.GetNthPath(0)))));
+                    square.GetNthPath(n)))));
 
-        float _newY = square.GetNthPath(0).magnitude;
-        PathCollider.transform.localScale = new Vector3(2, _newY * _originalPathColliderY, 0);
+        float _newY = square.GetNthPath(n).magnitude;
+        _pathCollider.transform.localScale = new Vector3(2, _newY * _originalPathColliderY, 0);
 
-        PathCollider.transform.position = square.GetNthPath(0) / 2;
+        _pathCollider.transform.position = (square.pathList[n] + square.pathList[n + 1]) / 2;
     }
 }