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Sketch-based modeling with few strokes

Joseph Jacob Cherlin, Faramarz Samavati, Mario Costa Sousa, Joaquim A. Jorge
2005 Proceedings of the 21st spring conference on Computer graphics - SCCG '05  
We present a novel sketch-based system for the interactive modeling of a variety of free-form 3D objects using just a few strokes.  ...  We also describe orthogonal deformation and cross sectional oversketching as editing tools to complement our modeling techniques.  ...  This research was supported by Discovery Grants from the Natural Sciences and Engineering Research Council of Canada and by the Portuguese Science Foundation (FCT) BSAB-458-2004.  ... 
doi:10.1145/1090122.1090145 dblp:conf/sccg/CherlinSSJ05 fatcat:cspb6pf6pzfshbgprtnbqu3iom

CONSTRAINT MODELING FOR CURVES AND SURFACES IN CAGD: A SURVEY

VINCENT CHEUTET, MARC DANIEL, STEFANIE HAHMANN, RAPHAEL LA GRECA, JEAN-CLAUDE LEON, ROBERT MACULET, DAVID MENEGAUX, BASILE SAUVAGE
2007 International journal of shape modeling  
Designing product shapes using geometric operations on free-form curves and surfaces is still a tedious task.  ...  A synthesis of these techniques and our current studies allows us to suggest a classification of the different constraints which ought to be taken into account in a constraint based modeling CAGD software  ...  Acknowledgments All the authors are members of the french research group "Geometric Modeling", part of the GDR CNRS ALP.  ... 
doi:10.1142/s0218654307000993 fatcat:ut24ngjdjrb7tp2isy7f4d5vsu

Geometric Modelling and Deformation for Shape Optimization of Ship Hulls and Appendages

Elisa Berrini, Bernard Mourrain, Yann Roux, Mathieu Durand, Guillaume Fontaine
2017 Journal of Ship Research  
The precise control of geometric models plays an important role in many domains such as Computer Aided geometric Design and numerical simulation.  ...  Finally, a surface reconstruction method is proposed to evaluate the shape's performances with CFD solvers.  ...  Acknowledgements: The project was achieved with the financial support of ANRT (Association Nationale de la Recherche et de la Technologie).  ... 
doi:10.5957/josr.61.2.160059 fatcat:hagfadn4fbevfibtxsqiupsfyu

Modeling Inlay/Onlay Prostheses with Mesh Deformation Techniques [chapter]

Kwan-Hee Yoo, Jong-Sung Ha, Jae-Soo Yoo
2007 Lecture Notes in Computer Science  
We exploit 3D mesh deformation techniques: direct manipulation free-form deformation (DMFFD) [9] and multiple wires deformation (MWD) [10] with three kinds of information: standard teeth models, scanned  ...  This paper presents a method for effectively modeling the outer surfaces of inlay/onlay prostheses restoring teeth that are partially destroyed.  ...  A wired curve is represented as a tuple > < f r s R W , , , , , where W and R are the free-form parametric curves that are the same in an initial state, s is a scalar for adjusting the radial size in the  ... 
doi:10.1007/978-3-540-72586-2_21 fatcat:monn3dq3kbc6fit2kuviffoqay

NURBS-Based Parametric Design for Ship Hull Form

Hui Zhou, Baiwei Feng, Zuyuan Liu, Haichao Chang, Xide Cheng
2022 Journal of Marine Science and Engineering  
to the parametric geometric modeling of hull curves and surfaces, and finally achieve the parametric deformation of hull surfaces driven by geometric feature parameters and develop the parametric deformation  ...  However, in most research, the NURBS technique is only applied to the mathematical representation of hull curves and surfaces, and the parametric deformation of hull surfaces based on geometric feature  ...  [11] proposed a combined approach for hull shape modeling and variation, which is based on a combination of the Subdivision Surface technique for hull surface modeling and Free Form Deformation for  ... 
doi:10.3390/jmse10050686 fatcat:tr44lw4rbfbotongbkfqtslgaq

A Comprehensive Numerical Study on Building-Excavation Interaction

Arman Maddah, Abbas Soroush
2020 Civil Engineering Journal  
Prior to the parametric study, the numerical modeling was verified by modeling a recorded case study, which is an anchored deep excavation adjacent to a 12-story building.  ...  The results of the parametric analyses suggest that for the given soil and excavation, (1) the position of the developing potential failure surface, PFS, in the soil behind the excavation is almost independent  ...  Conflicts of Interest The authors declare no conflict of interest. References  ... 
doi:10.28991/cej-2020-03091474 fatcat:6gutunc42nbzvk66x2akhgcsi4

Design Optimization of the Lines of the Bulbous Bow of a Hull Based on Parametric Modeling and Computational Fluid Dynamics Calculation

Weilin Luo, Linqiang Lan
2017 Mathematical and Computational Applications  
Parametric modeling was applied to the hull by using non-uniform rational basis spline (NURBS). The Rankine-source panel method was used to calculate the wave-making resistance.  ...  A Ro-Ro ship was taken as an example to illustrate the optimization method adopted, with the objective to minimize the wave-making resistance.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/mca22010004 fatcat:3nh4tyx3k5hdhiaadclvw3yuxa

Modeling for Deformable Body and Motion Analysis: A Review

Hailang Pan, Hongwen Huo, Guoqin Cui, Shengyong Chen
2013 Mathematical Problems in Engineering  
This paper surveys the modeling methods for deformable human body and motion analysis in the recent 30 years. First, elementary knowledge of human expression and modeling is introduced.  ...  Then, typical human modeling technologies, including 2D model, 3D surface model, and geometry-based, physics-based, and anatomy-based approaches, and model-based motion analysis are summarized.  ...  Geometry-based approach such as free form deformation (FFD) provides flexibility for the users to control deformations of models.  ... 
doi:10.1155/2013/786749 fatcat:ggek74i34jdzfhf7jay7gspldy

Constrained modifications of non-manifold B-reps

Guillaume Caumon, Charles H. Sword, Jean-Laurent Mallet
2003 Proceedings of the eighth ACM symposium on Solid modeling and applications - SM '03  
We present a method to deform locally a surface in a triangulated b-rep while maintaining a constant number of spatial regions in the model.  ...  This parametric space is used to 1) constrain the displacement of the deformed surface border and, 2) re-triangulate in the plane the neighboring surfaces around the modified contacts.  ...  The authors want to thank the members of this consortium, and especially ChevronTexaco for funding the PhD. of Guillaume Caumon.  ... 
doi:10.1145/781650.781657 fatcat:hliuz5q3ejfxfgbksznjqjxjwa

ShapeFlow: Learnable Deformation Flows Among 3D Shapes

Chiyu Max Jiang, Jingwei Huang, Andrea Tagliasacchi, Leonidas J. Guibas
2020 Neural Information Processing Systems  
We present ShapeFlow, a flow-based model for learning a deformation space for entire classes of 3D shapes with large intra-class variations.  ...  We parametrize the deformation between geometries as a learned continuous flow field via a neural network and show that such deformations can be guaranteed to have desirable properties, such as bijectivity  ...  The authors acknowledge the support of a Vannevar Bush Faculty fellowship, a grant form the Samsung GRO program, and gifts from Amazon AWS, Autodesk and Snap.  ... 
dblp:conf/nips/JiangHTG20 fatcat:zcwfznu4ovgy7kehawmp5axhem

Constrained modifications of non-manifold B-reps

Guillaume Caumon, Charles H. Sword, Jean-Laurent Mallet
2003 Proceedings of the eighth ACM symposium on Solid modeling and applications - SM '03  
We present a method to deform locally a surface in a triangulated b-rep while maintaining a constant number of spatial regions in the model.  ...  This parametric space is used to 1) constrain the displacement of the deformed surface border and, 2) re-triangulate in the plane the neighboring surfaces around the modified contacts.  ...  The authors want to thank the members of this consortium, and especially ChevronTexaco for funding the PhD. of Guillaume Caumon.  ... 
doi:10.1145/781606.781657 dblp:conf/sma/CaumonSM03 fatcat:5f4dx5vkebcvvnglhjgquym5bi

Volume-preserving free-form solid

Ari Rappoport, Alla Sheffer, Michel Bercovier
1995 Proceedings of the third ACM symposium on Solid modeling and applications - SMA '95  
In this paper we integrate all of these requirements in a single geometric primitive by endowing the tri-variate tensor product free-form solid with several important physical properties, including volume  ...  Some important trends in geometric modeling are the reliance on solid models rather than surfaceba.swd models and the enhancement of the expressive power of models, by using free-form objects in addition  ...  Acknowledgments Daniel Youlus participated in an early part of this work. I thank Naftali 'rishby for a fruitful comment and the reviewers for their detailed comments.  ... 
doi:10.1145/218013.218086 dblp:conf/sma/RappoportSB95 fatcat:tda4oijmw5bh7mklsyejoaxwni

The embedded isogeometric Kirchhoff–Love shell: From design to shape optimization of non-conforming stiffened multipatch structures

T. Hirschler, R. Bouclier, A. Duval, T. Elguedj, J. Morlier
2019 Computer Methods in Applied Mechanics and Engineering  
The model is built by employing the Free-Form Deformation principle.  ...  The NURBS composition defines the geometry of the shell while the displacement field is approximated using the same spline functions as for the embedded surface.  ...  This way, analytical sensitivity of the compliance is achieved in this work. Moreover, the Free-Form Deformation techniques offer a smooth and an effective way to impose complex shape variations.  ... 
doi:10.1016/j.cma.2019.02.042 fatcat:fks23atvzzfc7ejvbuxuamzlge

Volume-preserving free-form solids

A. Rappoport, A. Sheffer, M. Bercovier
1996 IEEE Transactions on Visualization and Computer Graphics  
In this paper we integrate all of these requirements in a single geometric primitive by endowing the tri-variate tensor product free-form solid with several important physical properties, including volume  ...  Some important trends in geometric modeling are the reliance on solid models rather than surfaceba.swd models and the enhancement of the expressive power of models, by using free-form objects in addition  ...  Acknowledgments Daniel Youlus participated in an early part of this work. I thank Naftali 'rishby for a fruitful comment and the reviewers for their detailed comments.  ... 
doi:10.1109/2945.489383 fatcat:5m54w634gjdmtbdmxy4jrg2jcq

A survey of parametric modelling methods for designing the head of a high-speed train

Ruibin Wang, Jianjun Zhang, Shaojun Bian, Lihuan You
2018 Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit  
Therefore, the ability of describing more local shape details with fewer design variables could serve as a main specification to assess the performance of various parametric modelling methods.  ...  This paper reviews these parametric modelling methods and classifies them into four categories: 2D, 3D, CATIA-based, and mesh deformation-based parametric modelling methods.  ...  Applying the free-form deformation (FFD) 34 to deform the meshes of high-speed strain heads can replace the remodeling and re-meshing step since it modifies part of grids and keeps the remaining grids  ... 
doi:10.1177/0954409718756558 fatcat:meai4xtifbbefcku7r4g44juda
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