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Surface Simulation
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Surface Simulation
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===Vapor Flow=== The movement of water vapor across the surface of the object is simulated with a method similar to the one used to simulate [[Temperature Calculation#Surface Temperature|heat diffusion]]. Vapor flows from areas of high pressure to areas of low pressure, so the vapor in a single point on the surface map of an object may spread or [https://en.wikipedia.org/wiki/Diffusion diffuse] into nearby points, and the vapor in those points may spread to the first point. Universe Sandbox calculates this diffusion by using the [https://en.wikipedia.org/wiki/FTCS_scheme FTCS method]. The water vapor pressure of each point on the surface map due to the water vapor present in that point is then updated based on the results of this diffusion calculation. [[File:EquatorWater.png|left|thumb|In this screenshot from Update 30, the Earth's rotation speed is fast enough that all the surface water has been pushed into a band at the equator.]]
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