This article presents a novel nonreflective boundary condition for the free surface incompressible Euler and Navier-Stokes equations. Boundaries of this type are very useful when, for example, simulating water flow around a ship moving over a wide ocean. Normally waves…
Continue Reading→To alleviate the laborious task of generating volumetric fracture pieces by hand while preserving the integrity of the artistically modeled shape, we develop a practical, robust, and effective solution for artistically directed volumetric fracture. Unlike previous approaches our procedural fracture…
Continue Reading→This document describes the basic compositing operations possible for deep image data format. We explain the idea of continuous alpha blending, and present formulas for computing cutout images that can be accurately composited by an ADD operation in the post-process…
Continue Reading→We have developed a novel approach to open-boundaries for fluid animations. More specifically we present a highly efficient energy absorbing boundary condition for the incompressible Navier-Stokes equations in the presence of a free surface. Our work extends and adapts a…
Continue Reading→Lighting models used in the production of computer generated feature animation have to be flexible, easy to control, and efficient to compute. Global illumination techniques do not lend themselves easily to flexibility, ease of use, or speed, and have remained…
Continue Reading→As computer-animated feature films divert from realism, the creative demands of directors and films change. A stylized or cartoon approach to motion blur in 3D animation is needed to support the exaggerated animation and visual style. Existing methods such as…
Continue Reading→One of the most common effects in the animated feature film Flushed Away are the splashes that result from a character’s interaction with a body of water. The quantity of shots that required this effect warranted the development of a…
Continue Reading→Trees have earned a reputation among lighting artists for being difficult to light in an appealing way. A tree canopy is composed of a myriad of leaves facing random directions. Without shadows, standard diffuse lighting of a canopy yields unappealing…
Continue Reading→For Shrek 2, a shader was required to render elegant fabrics such as taffeta and silk. Rather than designing a specific shader for each type of fabric, we decided to design one that was both general and extendable to many…
Continue Reading→Once again, we had the opportunity to launch fireballs in the CG animated feature film Shrek 2. After a day of nursing cloth simulations, there is nothing more gratifying than launching huge flames of fiery goo into the air. The…
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