Поиск внешних точек для текстуры в Unity 3D

gistfile1.cs

ArrayList GetOutlinePoints (Texture2D tex)
  {
		ArrayList outlinePoints = new ArrayList (tex.width * tex.height);	
	
		for (int x = 0; x < tex.width; x++) {
			for (int y = 0; y < tex.height; y++) {
				
				var alpha = tex.GetPixel (x, y).a;

				if (alpha != 0) {
					var p = new Vector2 (x, y);

					if (!ContainsPoint (outlinePoints, p))
						outlinePoints.Add (p);

					break;
				}
			}
		}
		
		for (int y = 0; y < tex.height; y++) {
			for (int x = tex.width - 1; x >= 0; x--) {
				
				var alpha = tex.GetPixel (x, y).a;
				if (alpha != 0) {
					var p = new Vector2 (x, y);

					if (!ContainsPoint (outlinePoints, p))
						outlinePoints.Add (p);

					break;
				}
			}
		}

		for (int x = tex.width - 1; x >= 0; x--) {
			for (int y = tex.height - 1; y >= 0; y--) {
				var alpha = tex.GetPixel (x, y).a;
				if (alpha != 0) {
					var p = new Vector2 (x, y);

					if (!ContainsPoint (outlinePoints, p))
						outlinePoints.Add (p);

					break;
				}
			}
		}

		for (int y = tex.height - 1; y >= 0; y--) {
			for (int x = 0; x < tex.width; x++) {
				var alpha = tex.GetPixel (x, y).a;
				if (alpha != 0) {
					var p = new Vector2 (x, y);

					if (!ContainsPoint (outlinePoints, p))
						outlinePoints.Add (p);

					break;
				}
			}
		}
		if (outlinePoints[0]) outlinePoints.Add (outlinePoints [0]);
			
		return outlinePoints;
	}
	
	bool ContainsPoint (ArrayList points, Vector2 value)
	{
		foreach (Vector2 p in points) {
			if (p == value)
				return true;
		}
		return false;
	}