VRMedic/Assets/Oculus/VR/Editor/PathHelper.cs

using System;
using System.IO;

public static class PathHelper
{
	public static string MakeRelativePath(string fromPath, string toPath)
	{
		var fromUri = new Uri(Path.GetFullPath(fromPath));
		var toUri = new Uri(Path.GetFullPath(toPath));

		if (fromUri.Scheme != toUri.Scheme)
		{
			return toPath;
		}

		var relativeUri = fromUri.MakeRelativeUri(toUri);
		var relativePath = Uri.UnescapeDataString(relativeUri.ToString());

		if (toUri.Scheme.Equals("file", StringComparison.InvariantCultureIgnoreCase))
		{
			relativePath = relativePath.Replace(Path.AltDirectorySeparatorChar, Path.DirectorySeparatorChar);
		}

		return relativePath;
	}
}