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This is a LENS shader that is used to remove the black squares due to a pixel that is not a number (floating point problems)
*** Especially usefull when using final gathering ***
How to know if you are in that case : if you increase the filter size
and your black squares increase too so you are in that case !
These pixels are replaced during rendering by the color in the parameters.
David Lanier 3D Plugins and shaders development company www.dl3d.com
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