A Simple Polygon counter for Unity

PolyCount.cs

using UnityEngine;
using UnityEditor;
using System.Collections;

public class PolyCount : EditorWindow {
	long numPolys = 0;
	bool deep = false;
	bool showList = false;
	Vector2 scroll = new Vector2();

	ArrayList childrenCounts = new ArrayList();

	[MenuItem ("Window/PolyCount")]
	static void Init () {
		// Get existing open window or if none, make a new one:
		PolyCount window = (PolyCount)EditorWindow.GetWindow (typeof (PolyCount));
		window.Show();
	}

	void OnSelectionChange() {
		Transform[] selected = Selection.transforms;
		numPolys = 0;

		foreach (Transform t in selected) {
			MeshFilter m = t.gameObject.GetComponent<MeshFilter>() as MeshFilter;

			if (m != null) {
				numPolys += m.sharedMesh.triangles.Length;
			}

			if (deep) {
				MeshFilter[] childrenFilters = t.gameObject.GetComponentsInChildren<MeshFilter>() as MeshFilter[];

				foreach(MeshFilter mf in childrenFilters) {
					numPolys += mf.sharedMesh.triangles.Length;
				}
			}
		}

		numPolys /= 3;

		Repaint();
	}

	void genList() {
		childrenCounts.Clear();

		Transform[] selected = Selection.transforms;
		GameObject current;

		foreach (Transform t in selected) {
			for (int i = 0; i < t.childCount; i++) {
				current = t.GetChild(i).gameObject;

				MeshFilter m = current.GetComponent<MeshFilter>() as MeshFilter;

				int currentPolys = 0;

				if (m != null) {
					currentPolys += m.sharedMesh.triangles.Length;
				}

				if (deep) {
					MeshFilter[] childrenFilters = current.GetComponentsInChildren<MeshFilter>() as MeshFilter[];
					
					foreach(MeshFilter mf in childrenFilters) {
						currentPolys += mf.sharedMesh.triangles.Length;
					}
				}

				currentPolys /= 3;

				childrenCounts.Add(new MyPolyCount(current, currentPolys));
			}
		}

		childrenCounts.Sort(new PolyCountCompare());

		showList = true;
	}

	void OnGUI () {
		deep = EditorGUILayout.Toggle("Include Children?", deep);
		EditorGUILayout.LabelField("Poly Count: " + numPolys);

		if (GUILayout.Button("List Children")) {
			genList();
		}


		showList = EditorGUILayout.Toggle("Show List?", showList);
		if (showList) {
			scroll = EditorGUILayout.BeginScrollView(scroll);

			for (int i = 0; i < childrenCounts.Count; i++) {
				MyPolyCount o = (MyPolyCount)childrenCounts[i];

				o.display();

				if (o.remove) {
					childrenCounts.RemoveAt(i);
				}
			}

			EditorGUILayout.EndScrollView();
		}
	}

	class MyPolyCount {
		public GameObject go;
		public int count = 0;
		public bool remove = false;

		public MyPolyCount(GameObject g, int c) {
			go = g;
			count = c;
		}

		public void display() {
			EditorGUILayout.BeginHorizontal();


			if (go == null) {
				remove = true;
				GUILayout.Label("(deleted)");
			} else if (GUILayout.Button(go.name)) {
				Selection.activeGameObject = go;
			}

			GUILayout.Label(count + "");

			EditorGUILayout.EndHorizontal();
		}

		public override string ToString() {
			return go.name + "\t\t" + count;
		}
	}

	class PolyCountCompare : IComparer {
		public int Compare(object a, object b) {
			MyPolyCount pcA = (MyPolyCount)a;
			MyPolyCount pcB = (MyPolyCount)b;
			
			return (pcB.count - pcA.count);
		}
	}
}