NPR Lenses: Interactive Tools for Non-Photorealistic Line Drawings

Abstract. NPR Lenses is an interactive technique for producing expressive non-photorealistic renderings. It provides an intuitive visual interaction tool for illustrators, allowing them to seamlessly apply a large variety of emphasis techniques. Advantages of 3D scene manipulation are combined with the capabilities of viewer-aligned lenses by inserting 2D lens controls into the 3D rendering pipeline. By using lenses that are spatially explicit and constrained we enable object-independent adjustments in 3D. Regions of emphasis can be easily created by adjusting lens parameters and any combination of line style, type, shape, and position of computer-generated lines. NPR Lenses support the creation of effects similar to those found in many existing hand-drawn illustrations and allow creative freedom through interactive control at the same time.

• Type: Conference
• Year: 2007
• Where: SG
• Authors: Petra Neumann, Tobias Isenberg, M. Sheelagh T. Carpendale
• Keywords: Expressive Non-photorealistic Renderings, Intuitive Visual Interaction, NPR Lenses, SG 2007