Rain drops on screen

Posted by user1075940 on Game Development See other posts from Game Development or by user1075940
Published on 2012-11-20T20:51:52Z Indexed on 2012/11/20 23:23 UTC
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XNA

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glsl

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hlsl

I am trying to make simple rain drop effect on screen.Something like this
http://fc00.deviantart.net/fs20/f/2007/302/5/6/Rain_drops_by_rockraikar.png

My idea is to:

Create small drop shaped normal textures,randomly put few on screen,apply texture perturbation and mix with current frame pixels.

Here are my questions:

-Does this idea even have sense?How professionals do this effect?Everything from text to code will be appreciated

-How to pass pixels to shader of already rendered frame?

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