RYAN: Rendering Your Animation Nonlinearly projected

Patrick Coleman and Karan Singh

NPAR 2004


Artistic rendering is an important research area in Computer Graphics, yet relatively little attention has been paid to the projective properties of computer generated scenes. Motivated by the surreal storyboard of an animation in production Ryan this paper describes interactive techniques to control and render scenes using nonlinear projections. The paper makes three contributions. First, we present a novel approach that distorts scene geometry such that when viewed through a standard linear perspective camera, the scene appears nonlinearly projected. Second, we describe a framework for the interactive authoring of nonlinear projections defined as a combination of scene constraints and a number of linear perspective cameras. Finally, we address the impact of nonlinear projection on rendering and explore various illumination effects. These techniques, implemented in Maya and used in the production of the animation Ryan, demonstrate how geometric and rendering effects resulting from nonlinear projections can be seamlessly introduced into current production pipelines.



Related Work:

Karan Singh "A Fresh Perspective"

Maneesh Agrawala, Denis Zorin, Tamara Munzner "Artistic Multiprojection Rendering"

Steve Seitz, Jinwon Kim The Space of All Stereo Images

Andrew Glassner Cubism and Cameras: Free-form Optics for Computer Graphics

Paul Rademacher and Gary Bishop Multiple-Center-of-Projection Images

Daniel Wood, Adam Finkelstein, John Hughes, Craig Thayer, David Salesin Multiperspective Panoramas


This research was supported by a software donation from Alias Systems.

patrick coleman dynamic graphics project university of toronto

patrick at dgp dot toronto dot edu