NEED HELP for position field function!!
Hey guys, I am currently working on a project about the oil spill tank. I am wondering if there is a field function which is relatively corresponding to the global coordinate?
That means, if I have known X and Y in the Cartesian coordinate, is it possible to create a field function to obtain the Z? Thank you so much in advance!! 
Maybe. What exactly do you want to achieve? How should your result look like?

You can generate easily a field function by right clicking on Tools/ Field functions and select New. Then open the Definition node. But, how does Z variable depend on the value of X and Y theoretically? Do you have some equation that gives you the value of Z according to X and Y?

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Ok, I assume that you know what is the equation for the surface according to the viscosity of surface. Then you can put X and Y to get the Z value.
You can show scalar variables by $ and vectors by $$. to find more about programming, search in the help "field function programming reference" 
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When the top surface is just inclined but flat, I would create a coordinate system parallel to the plane. Than you can reference the Zcoordinate directly. Something like $$Position("Coordinate System 1")[2]. Not fully sure about the syntax, I don't have the user guide open right now, but I'm pretty sure you'll find it. When the top surface is corrugated, it's much more complicated, so I'm too lazy to explain it when it's not necessary ;) 
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