Rheotomic surface / flowline relationship

Using the same tool as shown in the previous video
(http://vimeo.com/37060860)
This shows how rheotomic surfaces are made from the imaginary part of a complex function. Contours of this surface are streamlines of a potential flow.
If we take the real part of the same complex function, we get a surface whose contours are the corresponding orthogonal equipotentials.
The 2 parts can be combined to give a surface with spiralling contours, and if a linear flow is added, it makes the entire surface slope in a particular direction.
More details and download here:
http://www.grasshopper3d.com/profiles/blogs/rheotomic-surfaces-and-flowline-generation-tool

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