BOYÉ, Simon; BARLA, Pascal; GUENNEBAUD, Gael

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BOYÉ, Simon
Melting the frontiers between Light, Shape and Matter [MANAO]
Laboratoire Bordelais de Recherche en Informatique [LaBRI]
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

BARLA, Pascal
Melting the frontiers between Light, Shape and Matter [MANAO]
Laboratoire Bordelais de Recherche en Informatique [LaBRI]
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

GUENNEBAUD, Gael
Laboratoire Bordelais de Recherche en Informatique [LaBRI]
Laboratoire Photonique, Numérique et Nanosciences [LP2N]
Melting the frontiers between Light, Shape and Matter [MANAO]

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ACM Transactions on Graphics. 2012-11-01p. p.

Association for Computing Machinery

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The creation of free-form vector drawings as been greatly improved in recent years with techniques based on harmonic or bi-harmonic interpolation. Such methods offer the best trade-off between spar- sity (keeping the number of control points small) and expressivity (achieving complex shapes and gradients). Unfortunately, the lack of a robust and versatile method to compute such images still lim- its their use in real-world applications. In this paper, we introduce a vectorial solver for the computation of free-form vector gradi- ents. Based on Finite Element Methods (FEM), its key feature is to output a low-level vector representation suitable for very fast GPU accelerated rasterization and close-form evaluation. This interme- diate representation is hidden from the user: it is dynamically up- dated using FEM during drawing when control points are edited. Since it is output-insensitive, our approach enables novel possibili- ties for (bi)-harmonic vector drawings such as instancing, layering, deformation, texture and environment mapping. Finally, in this pa- per we also generalize and extend the set of drawing possibilities. In particular, we show how to locally control vector gradients.< Réduire

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A Vectorial Solver for Free-form Vector Gradient

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Résumé en anglais

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