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    <p>You can use <a href="http://www.opengl.org/registry/specs/EXT/transform_feedback.txt" rel="nofollow">transform feedback</a> to calculate the particle physics in the vertex shader and <a href="http://www.opengl.org/registry/specs/EXT/draw_instanced.txt" rel="nofollow">instancing</a> if you want to use 3D snowflakes. <a href="http://www.opengl.org/registry/specs/ARB/point_sprite.txt" rel="nofollow">Point sprites</a> should make billboards faster and use less memory for storing vertices. (You only need one per snowflake.)</p> <p>Running the particle system in the vertex shader will make it a few times faster while the math essentially stays the same.</p> <p>You could also use a 3D texture to offset the damping calculation so you can have visible turbulences.<br> If you use a heightmap for the ground, you can use that data to reset snowflakes that aren't visible anymore.</p> <p>Transform feedback and instancing are explained in <a href="http://rads.stackoverflow.com/amzn/click/0321712617" rel="nofollow">OpenGL SuperBible (Fifth Edition)</a> in chapter 12, point sprites are in chapter 7. <a href="http://www.starstonesoftware.com/OpenGL/" rel="nofollow">The source code for all examples is available online.</a> The example code for Mac OS X only goes up to chapter 7, <a href="http://www.starstonesoftware.com/OpenGL/mac.htm" rel="nofollow">but it should be possible to make most of it work.</a></p> <p>I couldn't find any good online tutorials, but the code well commented. The transform feedback example is called "flocking". For a snowflake simulation, one vertex shader should be enough for both updating and redering the particles in one pass.</p> <p>If you want lots of fast moving snow, the <a href="http://www.slideshare.net/icastano/cascades-demo-secrets" rel="nofollow">water particles from Nvidia's Cascades Demo</a> (starting at page 114) show an interesting approach to faking a large amount of particles.</p>
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