title: Can I use orthographic projection and perspective projection matrix both at once in DirectX. How can I?
body: <p>So, I want to start to make a game engine and I realized that I would have to draw 3D Objects and GUI(Immediate Mode) at the same time.</p>
  
  <p>3D objects will use the perspective projection matrix and as GUI is in 2D space I will have to use Orthographic projection matrix.</p>
  
  <p>So how can I implement that please anyone guide me. I'm not one of the professional Graphics programmers.</p>
  
  <p>Also I'm using DirectX 11 so keep it that way.</p>