test I default the pixel color to 'see through' basically (0,0f/0.0f/0.0f/0.0f), so you can see the bad pixels show through to the background.. here is a video:http://bh.polpo.org/simplify_badpixels.wmvIf you simply comment out lines 108-110 of the shader there, and uncomment line 106, the result SHOULD be identical.