Locally Controllable Stylized Shading (R&D)

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 unrealistic, shading effects is indispensable for many applications. We propose a set of simple stylized shading algorithms that allow the user to freely add localized light and shade to a model in a manner that is consistent and seamlessly integrated with conventional lighting techniques. The algorithms provide an intuitive, direct manipulation method based on a paint-brush metaphor, to control and edit the light and shade locally as desired. Our prototype system demonstrates how our method can enhance both the quality and range of applicability of conventional stylized shading for offline animation and interactive applications.

Figure: Comparison of conventional toon shading (up) with our result (below). Edits were made at the three key frames indicated

[DEMO Movie] (27MB, with sound)

More Examples

[Publication]　

(4.54MB)
Hideki Todo, Ken-ichi Anjyo, William Baxter, Takeo Igarashi, "Locally Controllable Stylized Shading", ACM Transactions on Graphics Volume 26, Issue 3, Article No.17 (SIGGRAPH2007, August 5-9 2007, San Diego, USA) 　　

[Example1] Editing shade and highlights (17MB, with sound)

The animation created using a standard cartoon shader was modified using our techniques. First the excessive highlight on the forehead was removed using the intensity brush, and then the boundary brush was used to create a light region around the chin, which was otherwise invisible.

[Example2] Modifying shading with gradations (15MB, with sound)

Here our prototype system has been used to make a directional lighting setup appear to be a more dramatic back-lit situation.

[Example3] Editing light and shade on a highly deforming object (27MB, with sound)

Using the intensity brush, we edited the light and/or dark areas on the deforming cape under rapidly changing lighting conditions.

Locally Controllable Stylized Shading

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