Hello there
I've been playing arround with the heightField node, and even though i can connect a ramp/noise texture or anything else, i can not connect a 2d fluid texture to it. Tryed a few ways now, tried to connect either R colour or R transparancy, but with no luck, also tried connecting through either ramp, or RGB - luminance noide, but no luck, so any help would be very apreciatet.
Btw. it all works fine when just connecting to displacement of a shader and render out.
Thank you
Karsten
Please any one?
Would be happy with just a possible or impossible 
just to know if its possible.
Thank you
Maybe you can simply render the fluids to image sequence and read it back.
As a side note i suggest you to dump the highFielfd thing and use instead the outline feature of the pfxToon system. Much-much better and robust.
The fluid nodes generally cannot be previewed with heightfield nodes( the exception is the fluid wake setup for oceans ).
However you can enable the fluid's "use heightfield" and "surface render" attributes, in which case the output opacity of the fluid is used for a height displacement (without needing a heightfield node).
Duncan