Stylized Rendering in the Style of Copperplate Engravings

Since their invention during the renaissance, copperplate engravings have been an important art form and a useful tool to create reproducible images. They appear stylistically similar to pen-and-ink drawings, but are cut into copper plates and printed instead of drawn directly onto the paper. This cutting process requires much effort and a high degree of skill, but results in pictures with extremely clean, precise lines. These long, smoothly curved lines are used to fill the page with many shades of hatching and set engravings apart from other line-based art forms. Stylized Rendering is a field of computer graphics that aims to render 3D scenes in a variety of non-photorealistic styles. While there are a number of works about creating images with line drawing and hatching, the specifics of the engravings style pose a unique challenge to stylized rendering. This is because the very long, smooth, and locally parallel hatching lines that define the engraving style are a poor match for previous methods. These have often been focused on the types of hatching found in pen-and-ink or pencil drawings, where lines are much shorter and have less variation. With this thesis, I present a novel approach to recreate the style of copperplate engravings in 3D rendering. It is especially focused on faithfully recreating the specific hatching style of engravings and applying it to dynamic scenes in a temporally coherent manner. This is achieved by creating and rendering individual hatching strokes that are continually updated to conform to the motion of the scene. My contribution lies in a new scheme for updating the shape and connectivity of hatching lines to ensure temporal coherence. This scheme adapts a number of steps from a previous approach for temporal continuity of contour lines and changes them to be applied to hatching.