title: recommended way to make a 2d HUD in webgl
body: <p>For a game in webgl where fps performance is important, what is the most efficient way to make a 2D HUD? I can think of 3 options, but its unclear to me what is the performance cost of each and which would be recommended as most efficient.</p>
  
  <p>So what is the relative performance cost between the 3 following options:</p>
  
  <p>A: render the hud with polygons in 3D using an orthographic camera and blend over the original scene. Advantage is advanced opengl effects are possible, at cost of manual arangement of containers. </p>
  
  <p>B: build the HUD in html/css and let the browser do compositing. Inthis case is there a big perf hit with browser composition?</p>
  
  <p>C: draw on a 2D canvas over the 3D canvas and let browser do compositing. Is this even possible and would I have issues with event propagation between canvases such as mouse events and focus.</p>
  
  <p>Many thanks!</p>