Research

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The computer graphics field of non-photorealistic rendering (NPR) aims at expanding the expressive power of computer graphics with alternate visual abstractions founded on knowledge and techniques long used by artists and scientific illustrators. NPR emphasizes specific features of a model, exposing subtle attributes, and omitting extraneous information.

(a) Costa Sousa & Buchanan '99b; (b) Costa Sousa & Prusinkiewicz '03; (c) Buchin et al. '04;
(d)
Kim et al. '09; (e) Costa Sousa et al. '03; (f) Maciejewski et al. ´08.

Over the years, the algorithms and methods from our NPR research have been applied in commercial and in-house computer graphics systems to compute shape analysis of scientific subjects, to extract shape features in 3D models, and to approximate the appearance of natural media (e.g., graphite pencil and pen-and-ink). These systems have been applied in various disciplines and domains of art, industrial design, 3D content creation (in the film, games, and animation industries), medicine, botanical sciences, geomatics & cartography, zoology, and archeology.

To date, NPR projects in our group are organized into six categories:

  1. Silhouette extraction (Brosz et al. '04, Buchanan & Costa Sousa '00, Foster et al. ['04, '07 ]);
  2. Automatic capture + reuse of artistic styles in 3D objects and images (Brunn et al. '07, dos Passos et al. '10, Kim et al. '09, Lapides et al. '10, Luo et al. '06);
  3. NPR for modeling representations (beyond meshes), including implicit surfaces (Foster et al. '05, Jepp et al. ['06, '08, '09], Proença et al. '08, Vital Brazil et al. ['10a, '11 ]) and vector graphics (Isenberg et al. '05);
  4. NPR algorithms encoding artistic composition principles (Costa Sousa & Gooch '03, Gooch & Costa Sousa '03, Rivotti et al. ´07), including alternate camera projections (Brosz et al. '07a);

  5. Pen-and-ink rendering of 3D models, inspired by and in collaboration with traditional scientific illustration techniques for depicting shape features, including two sub-categories: (5.1) Suggestive drawing, with demonstration examples in botany (Costa Sousa & Prusinkiewicz '03); and (5.2) Precise drawing (e.g., stippling and hatching), with demonstration examples in cartography (Buchin et al. '04), zoology (Kim et al. '09) , archeology and/or medicine (Costa Sousa et al. ['03, '04, '05c], Medeiros et al. '09, Paiva et al. '09), and mathematics (Paiva et al. '09).

  6. Comparative analysis of hand-drawn and computer-generated stippling rendering technique, in collaboration with scientific and medical illustrators (Isenberg et al. '06, Maciejewski et al. [07, 08]).


NPR Publications

Theses (6)
Journal Articles (10)
Conference Papers (20)

Brunn M.

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MSc

--

'06

Foster K.

MSc

'05

Jepp P.

PhD

'07

Medeiros J.

MSc

'07

Proença J.

MSc

'07

Rivotti V.

MSc

'07

Brunn et al. '07 (also, RT-4: M&S)
Costa Sousa et al. '03
Costa Sousa & Prusinkiewicz '03
Costa Sousa & Buchanan '00
Costa Sousa & Buchanan '99a
Foster et al. [
'05, '07]
Maciejewski et al. ´08
Paiva et al. '09
Vital Brazil et al. '11

Brosz et al. ['04, '07a]
Buchanan & Costa Sousa '00
Buchin et al. '04
Costa Sousa et al. '04
Costa Sousa & Buchanan '99b
dos Passos et al. '10
Foster et al. '04
Isenberg et al. [
'05, '06]
Jepp et al. [
'06, '08, '09]
Kim et al. '09 (also, RT-4: M&S)
Luo et al. '06
Maciejewski et al. ´07
Medeiros et al. '09
Proença et al. '08
Rivotti et al. ´07
Vital Brazil et al. '10a


Ext Abst. / Posters (1)
Repts / Course Notes (8)

Lapides et al. '10

Costa Sousa ['03 (a, b), '05c, '06 (c, d)]
Costa Sousa '07a - also RT-2 (counted in RT-2)
Costa Sousa et al. '05c
Costa Sousa & Gooch '03
Gooch & Costa Sousa '03


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