title: How to display texture on the screen?
body: <p>I have a unity scene. I try to display a texture that changes dynamically. </p>
  
  <p>I draw some shape on this texture. How can I do it?</p>
  
  <p>If I use <code>onGUI</code> and  <code>Graphics.DrawTexture</code> method, it works too slow on mobile platform.</p>