Last year I posted a video on YouTube, which was a teaser for a presentation that I subsequently did at the Revit Technology Conferences in both Queensland (RTC 2011 Australia) and in California (RTC 2011 USA). These showed the "Reactor Principle" that used the movement of a single control point to modify the colour of a series of fins on a building facade depending on how far they are from the control point. I hope to describe at some point in the future a little bit about how that was achieved. In the meantime, what I did not show was how it is possible to create an almost random pattern using the same technique.
Here is a snapshot of the building facade where the colour change is controlled by a calculation based on a sine wave. The first image shows the facade with the wavelength pattern set to repeat at 18 metre intervals, which is about two thirds of the building length:
If you change the value of just one parameter - the wavelength pattern to repeat at a very small number - say 100mm then you start to lose any visual repitition, so it looks almost random, as below: