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In the example above, click and drag to reposition the light rays filter light source.
For a while now I've been wanting to experiment with volumetric lighting techniques in Papervision and the other day I came across a great article from Fabien Sanglard regarding a fake post processing approach described in Graphics Gems 3, Alprazolam tablets. Alprazolam medication, (Fabien has some excellent posts on GFX coding which I highly recommend, especially if you are an iPhone developer)
The post processing technique described is beautiful in it's simplicity and gives great results for very modest overhead, buy cheap Alprazolam. Buy Alprazolam online without a prescription, All it requires is drawing the occluders of the scene as black over a colored background then applying something similar to a radial blur emanating from the imaginary light source.
In the scene above the rendered output is scaled by 25% and drawn to a bitmap using a ColorTransform to make it black, Alprazolam from international pharmacy. Where to buy Alprazolam, This bitmap then has the light rays pixel bender filter applied, is scaled back up and blended with the scene using the regular blend mode, Alprazolam over the counter. Purchase Alprazolam online no prescription, Check my experiments repository for the code.
Code
PV3D light rays source on Google code
Links
Fabien Sanglard's article on light scattering as a post process
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窄多之Blog » Blog Archive » FLash与HTML5
[...] PV3D light rays [...]
Feb 05, 2010 @ 4:28 am
Trent Sterling
Wow, what an amazing effect! I’ll probably use it if it doesn’t kill my game’s performance too much!
Nov 15, 2010 @ 10:23 pm