I hope you know some games, where you´re able to switch between different Views.

In Batman Arkham Asylum, you can switch to a scanning mode, where the complete level is viewed in a blue/violet color. And you´re able to see the Enemy skelettons through walls. Weapons are shown red..etc

in Wolfenstein, there´s the veil-dimension.



What i need to know:
Switching through that views is not difficult. just different shaders and different layers, wich changes on switching.

BUT,
how do i make the fading? I don´t want a immidiatly switch from one frame to another. I want to change like in this video from Wolfenstein:
http://www.youtube.com/watch?v=QYrkaYSeNHM


Any idea how to do that?

thats not another view, just a change of shaders

It could be done with one shader that interpolates between two shaders. Basically, you pass a value to the shader that does the calculations for both normal shading and fancy-pants shading -- when passed "0" the final result is the normal shading, and when passed "1" the final result is the fancy-pants shading, and this is done by interpolation so that values in-between can be used for a gradual transition.

Of course, the immediate response is: "Are you trying to kill my computer?? Why have one shader that does two shaders' work when you only see one result most of the time! What a waste!", but that really depends on how you do it. The difference might be a very small calculation (depending on the effect you want), so there's almost no performance hit. If the two shaders are wildly different then it is a waste, but you could have the "transition shader" enabled just during the transition between styles, and use independent shaders otherwise.

Jibb

you just need to interpolate between the two different color styles based on a value you calculate in you script and pass them in the shader for a simple interpolation,
like:

final_color=lerp(standart_color,crazy_color,color_lerp_var);

where "color_lerp" is the var you send in the shader through the "_var" extention.

you could also remove the effect from the view while "color_lerp" is "0".