Ray Tracing NPR-Style Feature Lines

Abstract

We present an algorithm for rendering constant-width line-like primitives within a ray tracing framework, which can render simple NPR-style feature lines, including silhouette edges, crease lines, and primitive intersection lines. The algorithm is based on ray differentials, which measure distances in screen space and are used to detect and render constant-width feature lines. This technique allows for a host of NPR-style raster algorithms to be ported to ray tracers.

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