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Preserving Form-Features in Interactive Mesh Deformation [chapter]

Hiroshi Masuda, Yasuhiro Yoshioka, Yoshiyuki Furukawa
2006 Lecture Notes in Computer Science  
We also show how to constrain the motion of a form feature on a plane or a straight line using linear constraints. The implemented system achieves a real-time response for constrained deformation.  ...  Geometric shapes are interactively deformed so that mean curvature normals are approximately preserved in a least-squares sense and positional constraints and form-feature constraints are precisely satisfied  ...  However, it is not effective for form-feature constraints, because a large number of hard constraints with two or more variables make equality-constrained least-squares systems less sparse.  ... 
doi:10.1007/11802914_15 fatcat:knnkipt3yfdvjp5aygiptbyccy

Preserving form features in interactive mesh deformation

Hiroshi Masuda, Yasuhiro Yoshioka, Yoshiyuki Furukawa
2007 Computer-Aided Design  
We also show how to constrain the motion of a form feature on a plane or a straight line using linear constraints. The implemented system achieves a real-time response for constrained deformation.  ...  Geometric shapes are interactively deformed so that mean curvature normals are approximately preserved in a least-squares sense and positional constraints and form-feature constraints are precisely satisfied  ...  However, it is not effective for form-feature constraints, because a large number of hard constraints with two or more variables make equality-constrained least-squares systems less sparse.  ... 
doi:10.1016/j.cad.2007.02.010 fatcat:qv4mfbwnprbwdpa4idzcq67g5i

An online composite graphics recognition approach based on matching of spatial relation graphs

Xu Xiaogang, Sun Zhengxing, Peng Binbin, Jin Xiangyu, Liu Wenyin
2004 International Journal on Document Analysis and Recognition  
Experimental results show that our proposed SRG-based approach is both efficient and effective for online composite graphics recognition in our sketchbased graphics input system -SmartSketchpad.  ...  A constrained partial permutation strategy is also proposed to reduce the computational cost of matching two SRGs, which is originally an NP-complete problem as is graph isomorphism.  ...  The work described in this paper was partially supported by a grant from the National Natural Science Foundation of China (Project No. 69903006, 60373065) and by a grant from the Research Grants Council  ... 
doi:10.1007/s10032-004-0126-3 fatcat:oklmtfos4rfzjh6vtmsbk4lo4u

Responsive Interaction Based on Sketch in Concept Styling [chapter]

Li Han, Giuseppe Conti, Raffaele De Amicis
2005 Lecture Notes in Computer Science  
We illustrate the implementation of the algorithm and we highlight its efficiency and feasibility for its adoption within Sketch-Based Modeling Systems (SBMS).  ...  This paper presents a responsive interaction technique which adopts a sketch-based interface capable of exploiting the stepwise refinement process typical of conceptual designing.  ...  The systems developed range from those pursuing a constraint-based or feature-based approach [1-3, 12, 13] , to those providing different forms of suggestive feedback and VR rendering [4] [5] [14] [15  ... 
doi:10.1007/11555261_11 fatcat:zaxnfso2g5gffktdj77lxdr6ya

Interactive mesh deformation using equality-constrained least squares

H. Masuda, Y. Yoshioka, Y. Furukawa
2006 Computers & graphics  
In this paper, we propose an equality-constrained least squares approach for stably deforming mesh models while approximately preserving mean curvature normals and strictly satisfying other constraints  ...  We solve the combination of hard and soft constraints by constructing a typical least squares systems using QR decomposition. A well-known problem of hard constraints is over-constraints.  ...  Acknowledgements The Armadillo, Bunny and Dragon models are courtesy of Stanford University, and the Mannequin model is courtesy of the Graphics and Imaging Laboratory, University of Washington.  ... 
doi:10.1016/j.cag.2006.08.012 fatcat:j2hw6fhq3vbhnanvubd7rvsxty

Freeform vector graphics with controlled thin-plate splines

Mark Finch, John Snyder, Hugues Hoppe
2011 ACM Transactions on Graphics  
The vector constraints are discretized over an image grid, and satisfied using a hierarchical solver. We demonstrate interactive authoring on a desktop CPU.  ...  We refine the representation with novel contour and slope curves, which anisotropically constrain interpolation derivatives.  ...  The solution is smooth only away from constrained points. Value constraints yield tent-like responses at isolated points and form creases along curves.  ... 
doi:10.1145/2070781.2024200 fatcat:7ureenchkjfhveioopjrwnxvze

Camera Control in Computer Graphics

Marc Christie, Patrick Olivier, Jean-Marie Normand
2008 Computer graphics forum (Print)  
We review the full range of solution techniques from constraint-based to optimization-based approaches, and conclude with an examination of occlusion management and expressiveness in the context of declarative  ...  Recent progress in modelling, animation and rendering means that rich, high fidelity virtual worlds are found in many interactive graphics applications.  ...  In addition, pure constraint-based systems cannot yield approximate solutions for over-constrained problems.  ... 
doi:10.1111/j.1467-8659.2008.01181.x fatcat:kz7l5crjgzfj3nb4soz356whdi

Camera control in computer graphics

Marc Christie, Patrick Olivier
2009 ACM SIGGRAPH ASIA 2009 Courses on - SIGGRAPH ASIA '09  
We review the full range of solution techniques from constraint-based to optimization-based approaches, and conclude with an examination of occlusion management and expressiveness in the context of declarative  ...  Recent progress in modelling, animation and rendering means that rich, high fidelity virtual worlds are found in many interactive graphics applications.  ...  In addition, pure constraint-based systems cannot yield approximate solutions for over-constrained problems.  ... 
doi:10.1145/1665817.1665820 dblp:conf/siggraph/ChristieO09 fatcat:yyatbnaei5crblefcafdkhx54e

3D Scene Manipulation with Constraints [chapter]

Graham Smith, Tim Salzman, Wolfgang Stuerzlinger
2001 Virtual and Augmented Architecture (VAA'01)  
In this paper, we introduce a new system that uses constraints to restrict object motion in a 3D scene, making interaction much simpler and more intuitive.  ...  To our knowledge, this is the first evaluation of 3D manipulation techniques with 2D devices and constraints.  ...  We have implemented such a constraint system in MIVE and call it the Partially Constrained (PC) mode.  ... 
doi:10.1007/978-1-4471-0337-0_4 fatcat:evrqviz6mzc2xaj4drnju43354

Freeform vector graphics with controlled thin-plate splines

Mark Finch, John Snyder, Hugues Hoppe
2011 Proceedings of the 2011 SIGGRAPH Asia Conference on - SA '11  
The vector constraints are discretized over an image grid, and satisfied using a hierarchical solver. We demonstrate interactive authoring on a desktop CPU.  ...  We refine the representation with novel contour and slope curves, which anisotropically constrain interpolation derivatives.  ...  The solution is smooth only away from constrained points. Value constraints yield tent-like responses at isolated points and form creases along curves.  ... 
doi:10.1145/2070752.2024200 fatcat:6o32dlsq4nhfromj4wkwugii2u

Freeform vector graphics with controlled thin-plate splines

Mark Finch, John Snyder, Hugues Hoppe
2011 Proceedings of the 2011 SIGGRAPH Asia Conference on - SA '11  
The vector constraints are discretized over an image grid, and satisfied using a hierarchical solver. We demonstrate interactive authoring on a desktop CPU.  ...  We refine the representation with novel contour and slope curves, which anisotropically constrain interpolation derivatives.  ...  The solution is smooth only away from constrained points. Value constraints yield tent-like responses at isolated points and form creases along curves.  ... 
doi:10.1145/2024156.2024200 fatcat:eaq563b3fjgvfhx56mum3v4zei

Exhibiting Mutator VR: Procedural Art Evolves to Virtual Reality

William Latham, Stephen Todd, Peter Todd, Lance Putnam
2019 Leonardo: Journal of the International Society for the Arts, Sciences and Technology  
We describe the graphics and audio systems, particularly the procedural generation and visual effects, and their creative exploitation as an art installation.  ...  Interface simplicity and discoverability is critical for VR exhibitions; as is the balance between an experience constrained by artist's choices and a freer (but riskier) one with greater public choice  ...  Acknowledgments This work was partially conducted in the Digital Creativity Labs, with support from the Engineering and Physical Sciences Research Council, the Arts and Humanities Research Council and  ... 
doi:10.1162/leon_a_01857 fatcat:fwmolsayp5dsbgfmjcbn5zlzl4

A Preference-Aware Interactive System for Online Shopping

Eisa Alanazi, Malek Mouhoub, Bandar Mohammed
2012 Computer and Information Science  
The branch and bound method is applied in order to provide the user with a list of best outcomes.  ...  These constraints and preferences represent a constraint optimization problem where optimal solutions (best outcomes) are those satisfying the hard constraints and maximizing the user's preferences.  ...  Table 1 lists some interactive systems along with their expressiveness in handling constraints and different forms of preferences.  ... 
doi:10.5539/cis.v5n6p33 fatcat:7ekxph5tebg4zjmppupboqcbaq

A classification and comparison framework for software architecture description languages

N. Medvidovic, R.N. Taylor
2000 IEEE Transactions on Software Engineering  
Architecture description languages (ADLs) have been proposed as modeling notations to support architecture-based development.  ...  There is, however, little consensus in the research community on what is an ADL, what aspects of an architecture should be modeled in an ADL, and which of several possible ADLs is best suited for a particular  ...  Constraints All ADLs constrain the usage of a component by specifying its interface as the only legal means of interaction.  ... 
doi:10.1109/32.825767 fatcat:pi3e2it2hbcqbcfbrpxtvwftpm

Interaction testing of highly-configurable systems in the presence of constraints

Myra B. Cohen, Matthew B. Dwyer, Jiangfan Shi
2007 Proceedings of the 2007 international symposium on Software testing and analysis - ISSTA '07  
Combinatorial interaction testing (CIT) is a method to sample configurations of a software system systematically for testing.  ...  We examine two highlyconfigurable software systems to quantify the nature of constraints in real systems.  ...  This work was supported in part by an EPSCoR FIRST award and by the Army Research Office through DURIP award W91NF-04-1-0104, and by the National Science Foundation through awards 0429149, 0444167, 0454203  ... 
doi:10.1145/1273463.1273482 dblp:conf/issta/CohenDS07 fatcat:2vshgkqazreevdxq72pwquzrpy
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