Soap bubbles. 2 [Computer graphics]

For pt.1 see ibid., previous issue. Soap bubbles are fragile, beautiful phenomena. They´re fun to make and play with, and their geometry is as clean and elegant as anything in nature, which makes them particularly suited to computer graphics. In pt.1 I discussed the nature of soap films. These thin sheets of soapy water have less surface tension than water itself, so they can billow out into curved surfaces like bubbles. In this part I talk about where a bubble´s beautiful colors come from, the geometry of bubble clusters, and how to make bubbles in a 3D modeler