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.
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Neumann, P., Isenberg, T., Carpendale, S. (2007). NPR Lenses: Interactive Tools for Non-photorealistic Line Drawings. In: Butz, A., Fisher, B., Krüger, A., Olivier, P., Owada, S. (eds) Smart Graphics. SG 2007. Lecture Notes in Computer Science, vol 4569. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-73214-3_2
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