Optimize GC for group frame.

Assets/Cryville/Crtr/GroupHandler.cs

@@ -1,7 +1,6 @@
 using Cryville.Common.Math;
 using Cryville.Crtr.Event;
 using System;
-using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
 
@@ -10,7 +9,7 @@ namespace Cryville.Crtr {
 		public ChartHandler ch;
 
 		SquareMatrix matFrame;
-		List<ContainerState> tracks;
+		ContainerState[] tracks;
 
 		public GroupHandler(Chart.Group tg, ChartHandler ch) : base() {
 			this.ch = ch;
@@ -28,20 +27,22 @@ namespace Cryville.Crtr {
 				from c in cs.Children
 				where c.Value.Container is Chart.Track
 				select c.Value
-			).ToList();
-			matFrame = SquareMatrix.WithPolynomialCoefficients(tracks.Count);
+			).ToArray();
+			matFrame = SquareMatrix.WithPolynomialCoefficients(tracks.Length);
+			frame = new ColumnVector<Vector3>(tracks.Length);
 		}
 
+		ColumnVector<Vector3> frame;
 		public ColumnVector<Vector3> GetCurrentFrame(Func<ContainerState, Vector3> func) {
-			var vl = from t in tracks select func(t);
-			return matFrame.Eliminate(
-				new ColumnVector<Vector3>(vl.ToArray()),
-				new Vector3Operator()
-			);
+			for (int i = 0; i < tracks.Length; i++)
+				frame[i] = func(tracks[i]);
+			return matFrame.Eliminate(frame, Vector3Operator.Instance);
 		}
 	}
 
 	class Vector3Operator : IVectorOperator<Vector3> {
+		public static Vector3Operator Instance = new Vector3Operator();
+
 		public Vector3 Add(Vector3 lhs, Vector3 rhs) {
 			return lhs + rhs;
 		}