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2013
Journal article
Restricted
Animation-aware quadrangulation
Marcias G., Pietroni N., Panozzo D., Puppo E., Sorkine O.
Geometric meshes that model animated characters must be designed while taking into account the deformations that the shape will undergo during animation. We analyze an input sequence of meshes with point-to-point correspondence, and we automatically produce a quadrangular mesh that fits well the input animation. We first analyze the local deformation that the surface undergoes at each point, and we initialize a cross field that remains as aligned as possible to the principal directions of deformation throughout the sequence. We then smooth this cross field based on an energy that uses a weighted combination of the initial field and the local amount of stretch. Finally, we compute a field-aligned quadrangulation with an off-the-shelf method. Our technique is fast and very simple to implement, and it significantly improves the quality of the output quad mesh and its suitability for character animation, compared to creating the quad mesh based on a single pose. We present experimental results and comparisons with a state-of-the-art quadrangulation method, on both sequences from 3D scanning and synthetic sequences obtained by a rough animation of a triangulated model.Source: Computer graphics forum (Online) 32 (2013): 167–175. doi:10.1111/cgf.12183
DOI: 10.1111/cgf.12183
Project(s): IMODEL
, V-MUST.NET
Metrics:
Marcias G., Pietroni N., Panozzo D., Puppo E., Sorkine O.
Geometric meshes that model animated characters must be designed while taking into account the deformations that the shape will undergo during animation. We analyze an input sequence of meshes with point-to-point correspondence, and we automatically produce a quadrangular mesh that fits well the input animation. We first analyze the local deformation that the surface undergoes at each point, and we initialize a cross field that remains as aligned as possible to the principal directions of deformation throughout the sequence. We then smooth this cross field based on an energy that uses a weighted combination of the initial field and the local amount of stretch. Finally, we compute a field-aligned quadrangulation with an off-the-shelf method. Our technique is fast and very simple to implement, and it significantly improves the quality of the output quad mesh and its suitability for character animation, compared to creating the quad mesh based on a single pose. We present experimental results and comparisons with a state-of-the-art quadrangulation method, on both sequences from 3D scanning and synthetic sequences obtained by a rough animation of a triangulated model.Source: Computer graphics forum (Online) 32 (2013): 167–175. doi:10.1111/cgf.12183
DOI: 10.1111/cgf.12183
Project(s): IMODEL
, V-MUST.NET Metrics:
See at:
Computer Graphics Forum 
| onlinelibrary.wiley.com | CNR ExploRA
2015
Journal article
Open Access
Data-Driven Interactive Quadrangulation
Marcias G., Takayama K., Pietroni N., Panozzo D., Sorkine-Hornung O., Puppo E., Cignoni P.
We propose an interactive quadrangulation method based on a large collection of patterns that are learned from models manually designed by artists. The patterns are distilled into compact quadrangulation rules and stored in a database. At run-time, the user draws strokes to define patches and desired edge flows, and the system queries the database to extract fitting patterns to tessellate the sketches' interiors. The quadrangulation patterns are general and can be applied to tessellate large regions while controlling the positions of the singularities and the edge flow. We demonstrate the effectiveness of our algorithm through a series of live retopology sessions and an informal user study with three professional artists.Source: ACM transactions on graphics 34 (2015). doi:10.1145/2766964
DOI: 10.1145/2766964
Project(s): HARVEST4D, IMODEL
Metrics:
Marcias G., Takayama K., Pietroni N., Panozzo D., Sorkine-Hornung O., Puppo E., Cignoni P.
We propose an interactive quadrangulation method based on a large collection of patterns that are learned from models manually designed by artists. The patterns are distilled into compact quadrangulation rules and stored in a database. At run-time, the user draws strokes to define patches and desired edge flows, and the system queries the database to extract fitting patterns to tessellate the sketches' interiors. The quadrangulation patterns are general and can be applied to tessellate large regions while controlling the positions of the singularities and the edge flow. We demonstrate the effectiveness of our algorithm through a series of live retopology sessions and an informal user study with three professional artists.Source: ACM transactions on graphics 34 (2015). doi:10.1145/2766964
DOI: 10.1145/2766964
Project(s): HARVEST4D
, IMODEL Metrics:
See at:
ISTI Repository 
| dl.acm.org | ACM Transactions on Graphics | CNR ExploRA
2016
Journal article
Open Access
Tracing Field-Coherent Quad Layouts
Pietroni N., Puppo E., Marcias G., Scopigno R., Cignoni P.
Given a cross field over a triangulated surface we present a practical and robust method to compute a field aligned coarse quad layout over the surface. The method works directly on a triangle mesh without requiring any parametrization and it is based on a new technique for tracing field-coherent geodesic paths directly on a triangle mesh, and on a new relaxed formulation of a binary LP problem, which allows us to extract both conforming quad layouts and coarser layouts containing t-junctions. Our method is easy to implement, very robust, and, being directly based on the input cross field, it is able to generate better aligned layouts, even with complicated fields containing many singularities. We show results on a number of datasets and comparisons with state-of-the-art methods.Source: Computer graphics forum (Print) 35 (2016): 485–496. doi:10.1111/cgf.13045
DOI: 10.1111/cgf.13045
Metrics:
Pietroni N., Puppo E., Marcias G., Scopigno R., Cignoni P.
Given a cross field over a triangulated surface we present a practical and robust method to compute a field aligned coarse quad layout over the surface. The method works directly on a triangle mesh without requiring any parametrization and it is based on a new technique for tracing field-coherent geodesic paths directly on a triangle mesh, and on a new relaxed formulation of a binary LP problem, which allows us to extract both conforming quad layouts and coarser layouts containing t-junctions. Our method is easy to implement, very robust, and, being directly based on the input cross field, it is able to generate better aligned layouts, even with complicated fields containing many singularities. We show results on a number of datasets and comparisons with state-of-the-art methods.Source: Computer graphics forum (Print) 35 (2016): 485–496. doi:10.1111/cgf.13045
DOI: 10.1111/cgf.13045
Metrics:
See at:
ISTI Repository | Computer Graphics Forum | www.scopus.com | CNR ExploRA