title: How can I subtract one Model3D object from another using HelixToolkit or 3D WPF?
body: <p>I am using the HelixToolkit.Wpf library to create some graphics for my application. I know that Helix provides a CuttingPlanesGroup that gives you the ability to create images like this one:
  <a href="https://imgur.com/0NUorOF" rel="nofollow noreferrer">https://imgur.com/0NUorOF</a></p>
  
  <p>But, the issue I am running into is that the CuttingPlanesGroup is a ModelVisual3D object, and I can't use that since I am already setting the content of my control to another ModelVisual3D.</p>
  
  <p>So, is there a way, either with Helix or with general 3D WPF to subtract one 3D shape from another one? That way, I could just make a cylinder and a 3D rectangle, and subtract one from the other.</p>