title: How to access the rendered screen pixels and manipulate them in unity? (3 gifs)
body: <p>I'm making a bullet hell shooter, and need to add effects of different types, and I wish I can access the screen pixels so I manipulate them, I have been able to do unique effects in texture 2D by shifting pixels and replacing them, but the camera pixels them selfs are not editable, </p>
  
  <p>type 1-
  <a href="https://i.stack.imgur.com/jfQCn.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jfQCn.gif" alt="effect2"></a>
  <a href="https://i.stack.imgur.com/TMUOe.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TMUOe.gif" alt="effect1"></a>
  <a href="https://i.stack.imgur.com/GOzOc.gif" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GOzOc.gif" alt="effect3"></a></p>
  
  <p>type 2-
  and being able to draw on screen lines between objects
  like this but in game not in editor, and make the lines zig zag, squiglly or dashed etc...
  <a href="https://i.stack.imgur.com/vpqb3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vpqb3.png" alt="lines"></a></p>
  
  <p>any hints ?</p>