Recent progress in non-photorealistic rendering (NPR) has led to many stylized shading techniques that efficiently convey visual information about the objects depicted. Another crucial goal of NPR is to give artists simple and direct ways to express the abstract ideas born of their imaginations. In particular, the ability to add intentional, but often… (More)
The Lit-Sphere model proposed by Sloan et al. (Proceedings of Graphics Interface 2001, pp. 143–150, 2001) is a method for emulating expressive artistic shading styles for 3D scenes. Assuming that artistic shading styles are described by view space normals, this model produces a variety of stylized shading scenes beyond traditional 3D lighting control.… (More)
Realistic image synthesis is an important research goal in computer graphics. One important factor to achieve this goal is a bidirectional reflectance distribution function (BRDF) that mainly governs an appearance of an object. Many BRDF models have therefore been developed. A physically-based BRDF based on microfacet theory [Cook and Torrance 1982] is… (More)
Existing texture projection methods are capable to produce irregular gradation shading, but still can not provide region control for acquiring artistic styles such as multiple lights effects and more detailed shading by painting. We improved the capability of light space normal notion from [Todo et al. 2013] by adjusting the <i>z</i> component so that… (More)
classroom use is granted without fee provided that copies are not made or distributed for commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored. For all other uses, contact the Owner/Author. Figure 1. (a)-(c)View-dependent highlights with the view… (More)
Stylized shading in 3D rendering can boost the appeal of appearance and feeling to the viewer. In order to mimic stylized shading in artwork, much research focuses on remodelling illumination and texture functions.