Rendering in black and white (grayscale)

#1 The best way to achieve that effect is probably by simply changing your game textures - especially if this is a constant effect. This has many advantages and allow you to have a broader audience - since the majority of people still do not have shader compatible video cards *gasp*.

However, in order to gradually shift from color to black and white your most likely have to use a shader.

-BenV

#2 I *think* these guys made their black-and-white stuff by just using b & w textures:

#3 Great shot, but for what he says, he is using shaders for it.

#4 They're definitely using shaders for the cell-shading & shadows,
but they don't say how they're getting the black-n-white.
i'm not sure why i think they just did it using textures, actually.
but it's an awesome pic!

#5 That basically could be no testures at all and only normal maps and geometry for example.

#6 I'm with Marc.

#7 Thanks for the help. What I need to do is simulate an old movie in a part of my game. Create copies of textures in BW require a time that I don't have, and would also be heavy by doubling it in memory. Nor do I have time to try to change the engine for this purpose, although i believe that is possible without shader. What I will do is use a filter on the camera, which I have done a test and is acceptable.

Thanks again