NPR Lenses: Interactive Tools for Non-photorealistic Line Drawings

  • Petra Neumann
  • Tobias Isenberg
  • Sheelagh Carpendale
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4569)


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.


Interactive Tool Spatial Distortion Creative Freedom Lens Parameter View Frustum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Petra Neumann
    • 1
  • Tobias Isenberg
    • 1
  • Sheelagh Carpendale
    • 1
  1. 1.Department of Computer Science, University of CalgaryCanada

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