title: Is there any .NET structure or class for 3D Points which is compatible with mono?
body: <p>I'm writing a application which is cross-platform.<br>
  There is already a structure at namespace <code>System::Windows::Media::Media3D::Point3D</code>.<br>
  The problem is that mono doesn't support <code>System::Windows</code> as part of project.  </p>
  
  <p>So I thought there might be structure or class for this purpose.<br>
  No matter if it's built-in or not.<br>
  I can also attach extensions as part of my project if the extension is light-weight and portable.<br>
  The only important thing is to be cross-platform.</p>