title: How to render a cross section in opengl
body: <p>I was trying to get the cross section of a model, using OpenGL. Specifically, I wanted to project the cross-section view onto a 2D plane. (for example, if I were to cut a pipe with zero-thickness and some finite length, perpendicular from top down, my output should be a circle in 2D view).</p>
  
  <p>I understand that <code>glClipPlane()</code> works, but my understanding is that the function slices the model along the plane, rather than projecting the slice. Is there a way to achieve what I want inside OpenGL?</p>