Vertex Shaders and Transforms

摘要

In 1975, the artist Richard Haas painted the flat side of a building in the Soho district of Manhattan to resemble the facade of a classic cast-iron building, including such features as a cat in a window. Time hasn't been kind to this painting, but in its early days, it looked very real and fooled many people. Such paintings-called trompe-lbeil, meaning "deceive the eye"-use shadows and shading to bring out a third dimension on a flat two-dimensional surface. We tend to be tickled by such illusions, but at the same time eager to satisfy ourselves that we can discern the trick. One simple way is to try observing the painting from different perspectives to see if it looks the same.