GUI for render target

Questions
#1

I want to use gui for render target instead of quad because quad needs to update window size and maybe some thing else. How i can do this? I trying "grading tutorial "with gui rectangle, but see only gray screen.

#2

Why not just change the view and projection to identity before drawing the quad pred ?

This is how I add some post effects

        -- Change quat to screen space 
         render.set_view(IDENTITY) 
         render.set_projection(vmath.matrix4()) 
  
         render.enable_texture(0, self.horizantal_target, render.BUFFER_COLOR_BIT) 
         render.draw(self.blur_pred, vertical) 
         render.disable_texture(0)
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