Add project files.

Assets/Cryville/Crtr/Components/TrackLine.cs

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+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Cryville.Crtr.Components {
+	public class TrackLine : SectionalGameObject {
+		readonly List<Vector3> vertices = new List<Vector3>();
+
+		public override void Init() {
+			base.Init();
+		}
+
+		protected override void AppendPointInternal(Vector3 p, Quaternion r) {
+			vertices.Add(p);
+		}
+
+		public override void Seal() {
+			var r = GetComponent<LineRenderer>();
+#if UNITY_5_6_OR_NEWER
+			r.positionCount = vertices.Count;
+#else
+			r.SetVertexCount(vertices.Count);
+#endif
+			for (int i = 0; i < vertices.Count; i++) r.SetPosition(i, vertices[i]);
+		}
+
+		public override void Reset() {
+			base.Reset();
+			vertices.Clear();
+		}
+	}
+}