How would you make such a filter??
Normally I guess I would like to see a scene with only the green colour component, unless it is emissive then maybe a more whitish green would be nice.
Changing the colour of my sun/moon, ambient and all light sources in my scene plus Emissive colours seems cumbersome.
Is there some smarter way?
Draw a single quad that covers the screen. It must be drawn last. An OrderedGroup would do the job. The blending must be set so that only green is shown. Setting the blending to modulate and use a green color would do this.
Ok, I follow you, but would that not make a black and green image?
I mean emissive colours and in some cases specular reflections should if they are very bright be white not green.
But with your method the most brightest emissive white will be pure green, not white. Am I correct?
This is what your filter would produce, right: (black/green)
http://www.thearmygame.com/gamemedia/3d/images/nightvision.jpg
But this is how it should look: (black/green/white)
Is there any way to make this, in a similar way to what you suggested?