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?
I adore a long, unwieldy sentence from time to time but this bad boy is simply a monster. Why is that though? Well, the writer overwhelms us with smart-sounding nonsense in an attempt to prove how intelligent they are. Yet if you keep your wits about you and look closely you’ll notice how imprecise and waffling the writing truly is. There’s just so much opportunity for revision!
Although most writing is like this, the problem is often hard to spot. That’s because sentences like those above make us feel dumb. We tend to think “yikes I don’t understand any of this so this chap must be smarter than me!” And that’s just what this obfuscatory language is designed to do.