In optics, a caustic is the envelope of light rays reflected or refracted by a curved surface or object, or the projection of that envelope of rays on another surface. The caustic is a curve or surface to which each of the light rays is tangent, defining a boundary of an envelope of rays as a curve of concentrated light.
A piece of milled plexiglass acting as a projecting lens; via the Computer Graphics and Geometry Lab at the École Polytechnique Fédérale de Lausanne
New milling techniques applied to glass and plexiglass panels could be used to “create windows that are also cryptic projectors, summoning ghostly images from sunlight.”
[Pauly and Bompas] hope that the technique will be used in architectural design, to create windows that mould sunlight and throw images or patterns onto walls or floors,” which, if timed, milled, and manipulated just right, could produce a slowly animated sequence of images being projected by an otherwise empty window during different times of day.
To control the shape of a caustic pattern generated by a specular or refractive surface, we need to solve the inverse problem: how can we change the surface geometry, such that incident light is redirected to produce a desired caustic image?
Another great dissertation from Mark Brown of Game Maker’s Toolkit: The Games that Designed Themselves. It’s the radical idea that designers should ignore their preconceived notions and look to the game itself to find out where the development should lead. How does something design itself? Well… the answer is: Prototypes.
A lot of great indie game masterpieces are the result of experimentation and early gameplay demos that changed the course of game’s development. As Brown points out, there’s a whole history of groundbreaking games that were developed “almost by accident” where bugs and glitches were turned into features.