title: openGL fading background
body: <p>I'm trying to create a particular effect where I have a bunch of particles on the screen which leave trails that slowly fade. I was hoping that I could simply use glClear with a small alpha value to do  this but that doesn't seem to be working.
  My second idea was to draw a black face on the front of the screen but this doesn't seem to be giving me the right effect, the particles are faded but the background doesn't really fade. My next idea is to render to a texture and fade that texture but that's a lot of extra work and I'm not sure if it will solve my problem. Can anyone think of a way to do this? Am I missing something?</p>
  
  <p><strong>Edit</strong> Also I'm having trouble finding information about rendering to a texture on android. If anyone has some links to articles that would be great.</p>