Card Shadows and God Rays

[WAS]

I guess,  what Ulco means is the effect that you can see on underwater images that look somehow similar like chromatic aberration. Like white light refracted by a prism which shifts the base colors a bit.
Ulco did that before, but atm I don't know, how he did it.

Oh I see what you mean the rainbow prism like under a ripple, yeah. Not sure how to achieve that appropriately, especially subtly in areas it should.

Also having a issue with quality of reflections,  I remember this being discussed with GI settings but couldn't fix it, must be remembering wrong. Still can't get displacement to really show when doing transparency method though.

Also screenshot with my "arctic" light colour and displacement shaders.

[WAS]

I tried doing multiple cards to filter light that have been warped individually to create spots of color in the highlight regions, but for some reason multiple cards begin slowly masking out the shadow. In fact it seems to "brighten" light.