So, for background, I’m trying to mod Xcom 2. It comes with a cut-down version of UE3, it seems. I’ve got pretty far, and now I’m trying to make an effect which greyscales everything except the reds in the scene.
The PostProcessing Chain is exposed, so I’ve dropped a material effect in there. I’ve more or less got it working, but some elements are ignored.
You can see that (some of) the reds are still in place (lights), but some things aren’t (windscreens, icon on the back barrier).
I’m guessing this has to do with emissive colours vs base colours, and translucency, but I don’t really understand enough about how materials work to take it to the next step.
So, I’m hoping one of you kind fellows can help me out. I can post my current material pipeline(?) to show what you I’ve done so far if that’s helpful, but essentially, I’m taking a scenecapture, deleting the green and blue channels, putting it through a cheapcontrast, for the alpha channel on a lerp between greyscale and the red-only channel. The subtraction prevents whites being painted as bright red, which was previously a problem.
But, I suspect there’s a much easier way to do this. Basically, I was to overlay the original reds (not including purples, whites, etc) over a greyscale of the image.
Thank you in advance.