Can Depth Fade be made to work only on Z Axis (height), rather than on camera distance? Or is there another solution?

[Knobbynobbes]

Hey all, quick quesiton. Is it possible to make the depth fade node work based on the depth from the top of the water, rather than distance from the camera? I want the ability to display objects in the water just like depth fade is able to when plugged into the base color, but I want the color change to be based on Z axis height, so that you can see distant objects as well as close ones, rather than having them fade out when they get too distant. You can see what I am talking about in this image of the old spyro games:

[dillzilla]

there is another solution although it only works for flat surfaces. i don’t have access to the engine right now but you can find it in the lake material of the water planes project files. i’ll post it later if i can find it