Over the centuries, visual artists developed a wide variety of valuable techniques for making expressive, pleasing, and communicative imagery -- this includes ways of painting, drawing, sculpting, and so forth. However, 3D computer graphics tools are typically designed as approximations to a realistic photographic model. Our goal is to expand the range of rendering styles available to artists and designers for creating images, animations, and interactive environments; in effect, to combine the expressivity of natural media with the flexibility of computer graphics. Furthermore, digital tools can make possible animated art forms that would be impossible with traditional media.
Benefits of non-photorealistic rendering include:
- Communication: Line art and cartoon illustration can efficiently convey the shape of a 3D surface; line art is often used for technical illustration, even when photographs are available.
- Expression: Cartoons and paintings have an expressive quality that allows an artist to convey mood and emotion; the universal qualities of cartoons allow viewers to immediately relate to the subject
- Aesthetics: Images created with traditional media can be beatiful, simply by the nature of the choices of stroke placement and the mixing of paint.
Our work includes research in the following areas:
Painterly rendering methods can process images and video to make them look hand-painted.
Multiperspective Rendering images to be rendered with non-linear perspective, freeing artists to combine images of objects with different viewpoints.
Smooth surface illustration creates pen-and-ink illustrations from 3D models.
Image analogies can automatically ``learn'' non-photorealistic rendering styles from examples.
A. Hertzmann, C. Jacobs, N. Oliver, B. Curless, D. Salesin.
SIGGRAPH 2001 Conference Proceedings.
Paint by Relaxation
Proc. CGI 2001: Computer Graphics International.
(Also NYU CS Technical Report 2000-801)
Algorithms for Rendering
in Artistic Styles
A. Hertzmann. Ph.D thesis. New York University. May, 2001.
A. Hertzmann, D. Zorin.
SIGGRAPH 2000 Conference Proceedings. New Orleans, Louisiana. July 23-28, 2000. pp. 517-526.
M. Agrawala, D. Zorin, T. Munzner.
11th Eurographics Workshop on Rendering. Brno, Czech Republic, 26-28 June 2000. pp. 125-136.
for Video and Interaction
A. Hertzmann, K. Perlin.
NPAR 2000: First International Symposium on Non-Photorealistic Animation andRendering. Annecy, France. June 5-7, 2000. pp. 7-12.
Painterly Rendering with Curved Brush
Strokes of Multiple Sizes
SIGGRAPH 98 Conference Proceedings. pp. 453-460. Orlando, Florida. July, 1998.