PP material distance to first translucent plane

A - camera

B - translucent plane

C - solid wall

A <==> B - postprocess for fog/mud water

B <==> C - clean air

Is there any way to get A-B distance instead of A-C?

you might be able to get it if you write the translucent plane/planes to a custom depth buffer. here is an example: Custom Depth in Unreal Engine 4 - Tom Looman
hope that helps :slight_smile: