Boat on the ocean renders i Rhino 6 and Flamingo

rendering boats on the water worked great in rhino 5. When i try to render boats on the water in Rhino 6 they dont look very good. Is there any tutorials for how to do it in rhino 6, or a sample model I can use?

can you post some files and examples of where you are with your rendering project so we can start to see what can be improved?