Combining Cubic Environment Mapping & Dot 3?

Blitz3D Forums/Blitz3D Programming/Combining Cubic Environment Mapping & Dot 3?

I'd like to use cubic mapping for the water in my game but without adding geometry (which I don't want to do) it looks like a flat mirror. Is there any way I can use a Dot 3 normal map to provide the necessary noise.

I had a quick go but it doesn't seem to work.

Or am I barking up the wrong tree?