title: How generate planes parallel to the camera view plane?
body: <p>I am trying to do texture-based volume reneding with a 3D texture. I just mapped this texture to a stack of planes but I need to have these planes parallel to the camera to avoid bad visualization when the camera is moved. Basically I want to make a viewport-aligned slices. I have been trying but I don't know how to start. first of all I want just one parallel slice.</p>
  
  <p>Any suggestions will be greatly appreciated!</p>