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Rendering optimisations for stylised sketching

conference contribution
posted on 2003-01-01, 00:00 authored by H Winnemoller, Shaun BangayShaun Bangay
We present work that specifically pertains to the rendering stage of stylised, non-photorealistic sketching. While a substantial body of work has been published on geometric optimisations, surface topologies, space-algorithms and natural media simulation, rendering-specific issues are rarely discussed in-depth even though they are often acknowledged. We investigate the most common stylised sketching approaches and identify possible rendering optimisations. In particular, we define uncertainty-functions, which are used to describe a human-error component, discuss how these pertain to geometric perturbation and textured silhouette sketching and explain how they can be cached to improve performance. Temporal coherence, which poses a problem for textured silhouette sketching, is addressed by means of an easily computed visibility-function. Lastly, we produce an effective yet surprisingly simple solution to seamless hatching, which commonly presents a large computational overhead, by using 3-D textures in a novel fashion. All our optimisations are cost-effective, easy to implement and work in conjunction with most existing algorithms.

History

Event

International conference on Computer graphics, virtual reality, visualisation and interaction in Africa (2nd : 2003 : Cape Town, South Africa)

Pagination

117 - 122

Publisher

ACM

Location

Cape Town, South Africa

Place of publication

New York, N. Y.

Start date

2003-02-03

End date

2003-02-05

ISBN-10

1581136439

Language

eng

Publication classification

E1.1 Full written paper - refereed

Title of proceedings

Afrigraph '03: Proceedings of the 2nd international conference on computer graphics, virtual reality, visualisation and interaction in Africa

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