title: How to create a trail effect in a rendertexture?
body: <p>I'm trying to create a cumulative trail effect in a render texture. By cumulative I mean that the render texture would show the last few frames overlaid on each other. Currently, when my camera outputs to a render texture it completely overwrites whatever was there previously. </p>
  
  <p>Let me know if I can clarify anything. </p>
  
  <p>Thanks!</p>