Obi Fluid Setup - Beginner Question

[hmhmhm]

Once again thank you. I didn't even realize that I had a negative figure there. Now it all works perfectly. This is for a maiden Unity/C# project, so your details on what to do when extending the class are invaluable and will save me (and anyone else reading this and in the same situation as me) many hours of researching and trial and error. Once again thank you for taking the time!