title: HLSL multiple passes to blur (RTT?)
body: <p>I try to build up a complex water shader ( i got the water shader from an example in the internet ).
  Now i want to add some features, blend a pattern grid into the water which is blured.
  Atm the water and the blur works, but when i try to build up the blur effekt with some randomization ... i use to many instruction for the shader ... :(</p>
  
  <p>I searched for topics like "hlsl multiple passes", "hlsl render to texture", "hlsl multiple passes without texture", cause i dont have an existing "ground" texture.</p>
  
  <p>I build up the water from a normal map and a enviroment map, now ... is it possible to get this "whole map / texture / shader data" from the first pass into the second ?
  Cause when i only execute the both passes, the color from the first pass get completely overwritten :(</p>
  
  <p>I hope you guys can understand my problem and have all the information you need.</p>
  
  <p>Would be nice if you would help me.</p>
  
  <p>Thanks...</p>