2017
Other
Restricted
Enhancing digital fabrication with advanced modeling techniques
Malomo L
A few years ago there were only expensive machineries dedicated to rapid prototyping for professionals or industrial application, while nowadays very affordable solutions are on the market and have become useful tools for experimenting, providing access to final users. Given the digital nature of these machine-controlled manufacturing processes, a clear need exists for computational tools that support this new way of productional thinking. For this reason the ultimate target of this research is to improve the easiness of use of such technologies, providing novel supporting tools and methods to ultimately sustain the concept of democratized design ("fabrication for the masses"). In this thesis we present a novel set of methods to enable, with the available manufacturing devices, new cost-effective and powerful ways of producing objects. The contributions of the thesis are three. The first one is a technique that allows to automatically create a tangible illustrative representation of a 3D model by interlocking together a set of planar pieces. Given an input 3D model, this technique produces the design of flat planar pieces that can be fabricated using a 2D laser cutter, using very cheap material (e.g., cardboard, acrylic, etc.). The produced pieces can be then manually assembled using automatically generated instructions. The second method allows the automatic design of flexible reusable molds, which can be used to produce many copies of an input digital object. The designs produced by this method can be directly sent to a 3D printer and used to liquid-cast multiple replicas using a wide variety of materials. The last technique is a method to fabricate, using a single-material 3D printer, objects with custom elasticity. The base idea is to create a set of microstructures that can be 3D-printed and used to replicate desired mechanical properties (Young's modulus and Poisson's ratio). Such microstructures can be distributed inside voxelized objects to vary their mechanical behavior. We also designed an optimization strategy that, varying the elastic properties inside the object volume, is able to design printable objects with a prescribed mechanical behavior, i.e. they exhibit a target deformation given some input forces.
Malomo L
A few years ago there were only expensive machineries dedicated to rapid prototyping for professionals or industrial application, while nowadays very affordable solutions are on the market and have become useful tools for experimenting, providing access to final users. Given the digital nature of these machine-controlled manufacturing processes, a clear need exists for computational tools that support this new way of productional thinking. For this reason the ultimate target of this research is to improve the easiness of use of such technologies, providing novel supporting tools and methods to ultimately sustain the concept of democratized design ("fabrication for the masses"). In this thesis we present a novel set of methods to enable, with the available manufacturing devices, new cost-effective and powerful ways of producing objects. The contributions of the thesis are three. The first one is a technique that allows to automatically create a tangible illustrative representation of a 3D model by interlocking together a set of planar pieces. Given an input 3D model, this technique produces the design of flat planar pieces that can be fabricated using a 2D laser cutter, using very cheap material (e.g., cardboard, acrylic, etc.). The produced pieces can be then manually assembled using automatically generated instructions. The second method allows the automatic design of flexible reusable molds, which can be used to produce many copies of an input digital object. The designs produced by this method can be directly sent to a 3D printer and used to liquid-cast multiple replicas using a wide variety of materials. The last technique is a method to fabricate, using a single-material 3D printer, objects with custom elasticity. The base idea is to create a set of microstructures that can be 3D-printed and used to replicate desired mechanical properties (Young's modulus and Poisson's ratio). Such microstructures can be distributed inside voxelized objects to vary their mechanical behavior. We also designed an optimization strategy that, varying the elastic properties inside the object volume, is able to design printable objects with a prescribed mechanical behavior, i.e. they exhibit a target deformation given some input forces.
See at:
etd.adm.unipi.it 
| CNR IRIS | CNR IRIS
2019
Journal article
Open Access
Mill and fold: shape simplification for fabrication
Muntoni A, Nuvoli S, Scalas A, Tola A, Malomo L, Scateni R
We introduce a pipeline for simplifying digital 3D shapes and fabricate them using 2D polygonal flat parts. Our method generates shapes that, once unfolded, can be fabricated with CNC milling machines using special tools called V-Grooves. These tools create V-shaped furrows at given angles depending on the shape of the used tool. Milling the edges of each flat facet simplifies the manual assembly, which consists only in folding adjacent facets at a constrained angle. Our method generates simplified shapes where every dihedral angle between adjacent facets belongs to a restricted set, thus making the assembly process quicker and more straightforward. Firstly, our method automatically computes a simplified version of the input model, using the marching cubes algorithm on the original mesh and iteratively performing local changes on the resulting triangle mesh. The user can then perform an additional manual simplification to remove unwanted facets. Finally, an unfolding algorithm, which takes into account the thickness of the material, flattens the polygonal facets onto the 2D plane, so that a CNC milling machine can fabricate it from a sheet of rigid material.Source: COMPUTERS & GRAPHICS, vol. 80, pp. 17-28
Muntoni A, Nuvoli S, Scalas A, Tola A, Malomo L, Scateni R
We introduce a pipeline for simplifying digital 3D shapes and fabricate them using 2D polygonal flat parts. Our method generates shapes that, once unfolded, can be fabricated with CNC milling machines using special tools called V-Grooves. These tools create V-shaped furrows at given angles depending on the shape of the used tool. Milling the edges of each flat facet simplifies the manual assembly, which consists only in folding adjacent facets at a constrained angle. Our method generates simplified shapes where every dihedral angle between adjacent facets belongs to a restricted set, thus making the assembly process quicker and more straightforward. Firstly, our method automatically computes a simplified version of the input model, using the marching cubes algorithm on the original mesh and iteratively performing local changes on the resulting triangle mesh. The user can then perform an additional manual simplification to remove unwanted facets. Finally, an unfolding algorithm, which takes into account the thickness of the material, flattens the polygonal facets onto the 2D plane, so that a CNC milling machine can fabricate it from a sheet of rigid material.Source: COMPUTERS & GRAPHICS, vol. 80, pp. 17-28
See at:
CNR IRIS 
| ISTI Repository | www.sciencedirect.com | CNR IRIS | CNR IRIS
2019
Other
Restricted
A survey on 3D shape segmentation with focus on digital fabrication
Filoscia I, Alderighi T Cignoni P, Giorgi D, Malomo L
Segmenting 3D objects into parts is fundamental to a number of applications in computer graphics, including parametrization, texture mapping, shape matching, morphing, multi-resolution modeling, mesh editing, compression and animation [22]. Broadly speaking, shape segmentation techniques can be divided into geometry-based and semantics-based techniques. Geometry-based segmentations aim to partition the object into parts which have well-defined geometric properties such as size, curvature, or distance to a fitting primitive like a plane. Semantics-based segmentations, in turn, aim at identifying parts which are either visually relevant or meaningful in a given context, such as functional parts on mechanical objects or body parts on human models. Recently, 3D segmentation also drawn attention as a tool for efficient fabrication. The decomposition of objects into parts, indeed, helps solving different issues related to fabrication, such as height field constraints, volume constraints and need for supporting structures. In this work we present a complete survey of segmentation techniques, also highlighting their strengths and weaknesses. Our aim is to produce a handy overview to people who want to approach the problem of segmentation, especially if they want to apply it to digital fabrication.
Filoscia I, Alderighi T Cignoni P, Giorgi D, Malomo L
Segmenting 3D objects into parts is fundamental to a number of applications in computer graphics, including parametrization, texture mapping, shape matching, morphing, multi-resolution modeling, mesh editing, compression and animation [22]. Broadly speaking, shape segmentation techniques can be divided into geometry-based and semantics-based techniques. Geometry-based segmentations aim to partition the object into parts which have well-defined geometric properties such as size, curvature, or distance to a fitting primitive like a plane. Semantics-based segmentations, in turn, aim at identifying parts which are either visually relevant or meaningful in a given context, such as functional parts on mechanical objects or body parts on human models. Recently, 3D segmentation also drawn attention as a tool for efficient fabrication. The decomposition of objects into parts, indeed, helps solving different issues related to fabrication, such as height field constraints, volume constraints and need for supporting structures. In this work we present a complete survey of segmentation techniques, also highlighting their strengths and weaknesses. Our aim is to produce a handy overview to people who want to approach the problem of segmentation, especially if they want to apply it to digital fabrication.
2019
Conference article
Open Access
State of the art on stylized fabrication
Pietroni N, Bickel B, Malomo L, Cignoni P
Digital fabrication devices are powerful tools for creating tangible reproductions of 3D digital models. Most available printing technologies aim at producing an accurate copy of a tridimensional shape. However, fabrication technologies can also be used to create a stylistic representation of a digital shape. We refer to this class of methods as stylized fabrication methods. These methods abstract geometric and physical features of a given shape to create an unconventional representation, to produce an optical illusion, or to devise a particular interaction with the fabricated model. In this course, we classify and overview this broad and emerging class of approaches and also propose possible directions for future research.
Pietroni N, Bickel B, Malomo L, Cignoni P
Digital fabrication devices are powerful tools for creating tangible reproductions of 3D digital models. Most available printing technologies aim at producing an accurate copy of a tridimensional shape. However, fabrication technologies can also be used to create a stylistic representation of a digital shape. We refer to this class of methods as stylized fabrication methods. These methods abstract geometric and physical features of a given shape to create an unconventional representation, to produce an optical illusion, or to devise a particular interaction with the fabricated model. In this course, we classify and overview this broad and emerging class of approaches and also propose possible directions for future research.
See at:
dl.acm.org | CNR IRIS | ISTI Repository | CNR IRIS | CNR IRIS
2021
Conference article
Open Access
A high quality 3D controller for mobile and desktop web applications
Fornari D, Malomo L, Cignoni P
The interaction between a 2D input device (like a mouse or a touchscreen) and a 3D object on the screen with the purpose of examining it in detail is a well-studied interaction problem. The inherent difference in degrees of freedom between input devices and possible 3D transformations makes it difficult to intuitively map inputs to operations to be performed on 3D objects. Although, over the years, studies led to a wide variety of solutions to overcome this problem, most of them are not actually available in real-world applications. In particular, for 3D web applications, only basic solutions are often implemented, and even the most used web framework for 3D still lacks state of the art implementations. We will face the problem of 3D interaction through touch and mouse input, and we propose our implementation of a 3D view manipulator for web applications, which offers a natural control, advanced functionalities, and provides an easy-to-use interface for both desktop and mobile environments.
Fornari D, Malomo L, Cignoni P
The interaction between a 2D input device (like a mouse or a touchscreen) and a 3D object on the screen with the purpose of examining it in detail is a well-studied interaction problem. The inherent difference in degrees of freedom between input devices and possible 3D transformations makes it difficult to intuitively map inputs to operations to be performed on 3D objects. Although, over the years, studies led to a wide variety of solutions to overcome this problem, most of them are not actually available in real-world applications. In particular, for 3D web applications, only basic solutions are often implemented, and even the most used web framework for 3D still lacks state of the art implementations. We will face the problem of 3D interaction through touch and mouse input, and we propose our implementation of a 3D view manipulator for web applications, which offers a natural control, advanced functionalities, and provides an easy-to-use interface for both desktop and mobile environments.
See at:
diglib.eg.org | CNR IRIS | ISTI Repository | CNR IRIS
2015
Journal article
Open Access
Mesh joinery: a method for building fabricable structures
Cignoni P, Pietroni N, Malomo L, Scopigno R
Mesh joinery is an innovative method to produce illustrative shape approximations suitable for fabrication. Mesh joinery is capable of producing complex fabricable structures in an efficient and visually pleasing manner. We represent an input geometry as a set of planar pieces arranged to compose a rigid structure by exploiting an efficient slit mechanism. Since slices are planar, a standard 2D cutting system is sufficient to fabricate them.Source: ERCIM NEWS, vol. 101, pp. 44-45
Project(s): HARVEST4D
Cignoni P, Pietroni N, Malomo L, Scopigno R
Mesh joinery is an innovative method to produce illustrative shape approximations suitable for fabrication. Mesh joinery is capable of producing complex fabricable structures in an efficient and visually pleasing manner. We represent an input geometry as a set of planar pieces arranged to compose a rigid structure by exploiting an efficient slit mechanism. Since slices are planar, a standard 2D cutting system is sufficient to fabricate them.Source: ERCIM NEWS, vol. 101, pp. 44-45
Project(s): HARVEST4D
See at:
ercim-news.ercim.eu | CNR IRIS | CNR IRIS
2013
Patent
Open Access
Mesh joinery: method for converting a 3D model into a set of planar shapes that can be interlocked to compose a self-supporting structure
Cignoni P, Pietroni N, Malomo L, Scopigno R
Cignoni P, Pietroni N, Malomo L, Scopigno R
See at:
CNR IRIS | ISTI Repository | CNR IRIS
2014
Other
Restricted
Generalized trackball for surfing over surfaces
Malomo L, Cignoni P, Scopigno R
We present a friendly, efficient 3D interaction technique that, generalizing the well known trackball approach, unifies and blends the two common interaction mechanisms known as panning and orbiting. The approach allows to inspect a virtual object by navigating over its surrounding space, remaining at a chosen distance and performing a sort of automatic panning over its surface. This generalized trackball allows an intuitive navigation of topologically complex shapes, by enabling unexperienced users to visit hard-to-be-reached parts better and faster than with standard GUI components. The approach is based on the construction of multiple smooth approximations of the model under inspection and, at rendering time, it constrains the camera to stay at a given distance to these approximations. The approach is designed to require negligible preprocessing and memory overhead and works well for both mouse-based and touch interfaces. A user study confirms the impact of the proposed technique.Project(s): HARVEST4D
Malomo L, Cignoni P, Scopigno R
We present a friendly, efficient 3D interaction technique that, generalizing the well known trackball approach, unifies and blends the two common interaction mechanisms known as panning and orbiting. The approach allows to inspect a virtual object by navigating over its surrounding space, remaining at a chosen distance and performing a sort of automatic panning over its surface. This generalized trackball allows an intuitive navigation of topologically complex shapes, by enabling unexperienced users to visit hard-to-be-reached parts better and faster than with standard GUI components. The approach is based on the construction of multiple smooth approximations of the model under inspection and, at rendering time, it constrains the camera to stay at a given distance to these approximations. The approach is designed to require negligible preprocessing and memory overhead and works well for both mouse-based and touch interfaces. A user study confirms the impact of the proposed technique.Project(s): HARVEST4D
2014
Journal article
Open Access
Field-aligned mesh joinery
Cignoni P, Pietroni N, Malomo L
We have proposed a novel method for the automatic fabrication of an illustrative representation of a given geometry made up of interlocked planar slices. We have shown the effectiveness of our method both in terms of illustrative quality and physical stability. To the best of our knowledge, no existing fabrication paradigms are able to represent such complex objects. Our method is particularly efficient in terms of production costs. In fact, the production costs scalewith the surface of the object since slices are sampled almost uniformly over the surface. In addition, due to the slice decomposition, mesh joinery is also suitable for the production of medium-scale objects. A useful extension of our framework would be to automatically generate effective instructions to simplify the manual assembly procedure, for example, a packing strategy that could preserve the partial ordering of the model to facilitate the search for the next piece. © 2014 ACM 0730-0301/2014/01-ART3 15.00.Source: ACM TRANSACTIONS ON GRAPHICS (ONLINE), vol. 33 (issue 1)
Cignoni P, Pietroni N, Malomo L
We have proposed a novel method for the automatic fabrication of an illustrative representation of a given geometry made up of interlocked planar slices. We have shown the effectiveness of our method both in terms of illustrative quality and physical stability. To the best of our knowledge, no existing fabrication paradigms are able to represent such complex objects. Our method is particularly efficient in terms of production costs. In fact, the production costs scalewith the surface of the object since slices are sampled almost uniformly over the surface. In addition, due to the slice decomposition, mesh joinery is also suitable for the production of medium-scale objects. A useful extension of our framework would be to automatically generate effective instructions to simplify the manual assembly procedure, for example, a packing strategy that could preserve the partial ordering of the model to facilitate the search for the next piece. © 2014 ACM 0730-0301/2014/01-ART3 15.00.Source: ACM TRANSACTIONS ON GRAPHICS (ONLINE), vol. 33 (issue 1)
See at:
CNR IRIS | www.scopus.com | CNR IRIS | CNR IRIS
2015
Journal article
Open Access
LecceAR: an augmented reality App for cultural heritage
Banterle F, Cardillo F A, Malomo L
Augmented Reality (AR) - the augmentation of a physical world's view with digital media - has recently gained popularity thanks to the increasing computational power and diffusion of mobile devices such as tablets, and smartphones. These developments allow many practical applications of AR technology, especially in the cultural heritage domain. LecceAR is an advanced app that allows tourists to view rich 3D reconstructions of cultural heritage sites within the city of Lecce in Italy. LecceAR is an iOS app for markerless AR that will be exhibited at the MUST museum in Lecce, Italy. The app shows a rich 3D reconstruction of the Lecce Roman amphitheatre, which is only partially unearthed (see Figure 1). The use of state-of-the-art algorithms in computer graphics and computer vision allows an ancient theatre to be viewed and explored in real-time.Source: ERCIM NEWS, vol. 103, pp. 16-17
Banterle F, Cardillo F A, Malomo L
Augmented Reality (AR) - the augmentation of a physical world's view with digital media - has recently gained popularity thanks to the increasing computational power and diffusion of mobile devices such as tablets, and smartphones. These developments allow many practical applications of AR technology, especially in the cultural heritage domain. LecceAR is an advanced app that allows tourists to view rich 3D reconstructions of cultural heritage sites within the city of Lecce in Italy. LecceAR is an iOS app for markerless AR that will be exhibited at the MUST museum in Lecce, Italy. The app shows a rich 3D reconstruction of the Lecce Roman amphitheatre, which is only partially unearthed (see Figure 1). The use of state-of-the-art algorithms in computer graphics and computer vision allows an ancient theatre to be viewed and explored in real-time.Source: ERCIM NEWS, vol. 103, pp. 16-17
See at:
ercim-news.ercim.eu | CNR IRIS | CNR IRIS
2015
Journal article
Open Access
Elastic textures for additive fabrication
Panetta J, Zhou Q, Malomo L, Pietroni N, Cignoni P, Zorin D
We introduce elastic textures: a set of parametric, tileable, printable, cubic patterns achieving a broad range of isotropic elastic material properties: the softest pattern is over a thousand times softer than the stiffest, and the Poisson's ratios range from below zero to nearly 0.5. Using a combinatorial search over topologies followed by shape optimization, we explore a wide space of truss-like, symmetric 3D patterns to obtain a small family. This pattern family can be printed without internal support structure on a single-material 3D printer and can be used to fabricate objects with prescribed mechanical behavior. The family can be extended easily to create anisotropic patterns with target orthotropic properties. We demonstrate that our elastic textures are able to achieve a user-supplied varying material property distribution. We also present a material optimization algorithm to choose material properties at each point within an object to best fit a target deformation under a prescribed scenario. We show that, by fabricating these spatially varying materials with elastic textures, the desired behavior is achieved. Copyright is held by the owner/author(s).Source: ACM TRANSACTIONS ON GRAPHICS, vol. 34 (issue 4)
Panetta J, Zhou Q, Malomo L, Pietroni N, Cignoni P, Zorin D
We introduce elastic textures: a set of parametric, tileable, printable, cubic patterns achieving a broad range of isotropic elastic material properties: the softest pattern is over a thousand times softer than the stiffest, and the Poisson's ratios range from below zero to nearly 0.5. Using a combinatorial search over topologies followed by shape optimization, we explore a wide space of truss-like, symmetric 3D patterns to obtain a small family. This pattern family can be printed without internal support structure on a single-material 3D printer and can be used to fabricate objects with prescribed mechanical behavior. The family can be extended easily to create anisotropic patterns with target orthotropic properties. We demonstrate that our elastic textures are able to achieve a user-supplied varying material property distribution. We also present a material optimization algorithm to choose material properties at each point within an object to best fit a target deformation under a prescribed scenario. We show that, by fabricating these spatially varying materials with elastic textures, the desired behavior is achieved. Copyright is held by the owner/author(s).Source: ACM TRANSACTIONS ON GRAPHICS, vol. 34 (issue 4)
See at:
dl.acm.org | CNR IRIS | ISTI Repository | CNR IRIS | CNR IRIS
2015
Conference article
Open Access
VirtualTour: a system for exploring cultural heritage sites in an immersive way
Malomo L, Banterle F, Pingi P, Gabellone F, Scopigno R
In the last few years, mobile or wearable virtual reality has gained new interest amongst the industry and researchers. The rapid development of new technologies such as high quality head mounted displays, accurate and cheap motion sensors (e.g. accelerometers, gyroscopes, depth cameras, etc.), localization sensors (e.g. GPS, compass, etc.) etc. have led to new opportunities that just a few years ago were not possible to achieve with off-the-shelf components. This renaissance of virtual reality is happening in both research and practical applications, such as computer games, movies, documentaries, learning, urban planning, etc. In this work we propose a system, VirtualTour, offering virtual exploration of Cultural Heritage (CH) sites on mobile devices based on a natural interaction approach; a few easy to understand (and to be tracked) actions performed by the user in the real world are translated into navigation instructions in the virtual world. To achieve this goal, we have exploited embedded sensors and the fast hardware of modern mobile devices.
Malomo L, Banterle F, Pingi P, Gabellone F, Scopigno R
In the last few years, mobile or wearable virtual reality has gained new interest amongst the industry and researchers. The rapid development of new technologies such as high quality head mounted displays, accurate and cheap motion sensors (e.g. accelerometers, gyroscopes, depth cameras, etc.), localization sensors (e.g. GPS, compass, etc.) etc. have led to new opportunities that just a few years ago were not possible to achieve with off-the-shelf components. This renaissance of virtual reality is happening in both research and practical applications, such as computer games, movies, documentaries, learning, urban planning, etc. In this work we propose a system, VirtualTour, offering virtual exploration of Cultural Heritage (CH) sites on mobile devices based on a natural interaction approach; a few easy to understand (and to be tracked) actions performed by the user in the real world are translated into navigation instructions in the virtual world. To achieve this goal, we have exploited embedded sensors and the fast hardware of modern mobile devices.
See at:
CNR IRIS | ieeexplore.ieee.org | CNR IRIS
2016
Conference article
Restricted
Generalized trackball for surfing over surfaces
Malomo L, Cignoni P, Scopigno R
We present an efficient 3D interaction technique: generalizing the well known trackball approach, this technique unifies and blends the two common interaction mechanisms known as panning and orbiting. The approach allows to inspect a virtual object by navigating over its surrounding space, remaining at a chosen distance and performing an automatic panning over its surface. This generalized trackball allows an intuitive navigation of topologically complex shapes, enabling unexperienced users to visit hard-to-reach parts better and faster than with standard GUI components. The approach is based on the construction of multiple smooth approximations of the model under inspection; at rendering time, it constrains the camera to stay at a given distance to these approximations. The approach requires negligible preprocessing and memory overhead and works well for both mouse-based and touch interfaces. An informal user study confirms the impact of the proposed technique.Project(s): HARVEST4D
Malomo L, Cignoni P, Scopigno R
We present an efficient 3D interaction technique: generalizing the well known trackball approach, this technique unifies and blends the two common interaction mechanisms known as panning and orbiting. The approach allows to inspect a virtual object by navigating over its surrounding space, remaining at a chosen distance and performing an automatic panning over its surface. This generalized trackball allows an intuitive navigation of topologically complex shapes, enabling unexperienced users to visit hard-to-reach parts better and faster than with standard GUI components. The approach is based on the construction of multiple smooth approximations of the model under inspection; at rendering time, it constrains the camera to stay at a given distance to these approximations. The approach requires negligible preprocessing and memory overhead and works well for both mouse-based and touch interfaces. An informal user study confirms the impact of the proposed technique.Project(s): HARVEST4D
See at:
diglib.eg.org | CNR IRIS | CNR IRIS
2016
Journal article
Open Access
FlexMolds: Automatic Design of Flexible Shells for Molding
Malomo L, Pietroni N, Bickel B, Cignoni P
We present FlexMolds, a novel computational approach to automatically design flexible, reusable molds that, once 3D printed, allow us to physically fabricate, by means of liquid casting, multiple copies of complex shapes with rich surface details and complex topology. The approach to design such flexible molds is based on a greedy bottom-up search of possible cuts over an object, evaluating for each possible cut the feasibility of the resulting mold. We use a dynamic simulation approach to evaluate candidate molds, providing a heuristic to generate forces that are able to open, detach, and remove a complex mold from the object it surrounds. We have tested the approach with a number of objects with nontrivial shapes and topologies.Source: ACM TRANSACTIONS ON GRAPHICS, vol. 35 (issue 6)
Malomo L, Pietroni N, Bickel B, Cignoni P
We present FlexMolds, a novel computational approach to automatically design flexible, reusable molds that, once 3D printed, allow us to physically fabricate, by means of liquid casting, multiple copies of complex shapes with rich surface details and complex topology. The approach to design such flexible molds is based on a greedy bottom-up search of possible cuts over an object, evaluating for each possible cut the feasibility of the resulting mold. We use a dynamic simulation approach to evaluate candidate molds, providing a heuristic to generate forces that are able to open, detach, and remove a complex mold from the object it surrounds. We have tested the approach with a number of objects with nontrivial shapes and topologies.Source: ACM TRANSACTIONS ON GRAPHICS, vol. 35 (issue 6)
See at:
dl.acm.org | CNR IRIS | ISTI Repository | CNR IRIS | CNR IRIS
2018
Journal article
Open Access
State of the art on stylized fabrication
Bickel B, Cignoni P, Malomo L, Pietroni N
Digital fabrication devices are powerful tools for creating tangible reproductions of 3D digital models. Most available printing technologies aim at producing an accurate copy of a tridimensional shape. However, fabrication technologies can also be used to create a stylistic representation of a digital shape. We refer to this class of methods as 'stylized fabrication methods'. These methods abstract geometric and physical features of a given shape to create an unconventional representation, to produce an optical illusion or to devise a particular interaction with the fabricated model. In this state-of-the-art report, we classify and overview this broad and emerging class of approaches and also propose possible directions for future research.Source: COMPUTER GRAPHICS FORUM (PRINT), vol. 37 (issue 6), pp. 325-342
Project(s): EMOTIVE
Bickel B, Cignoni P, Malomo L, Pietroni N
Digital fabrication devices are powerful tools for creating tangible reproductions of 3D digital models. Most available printing technologies aim at producing an accurate copy of a tridimensional shape. However, fabrication technologies can also be used to create a stylistic representation of a digital shape. We refer to this class of methods as 'stylized fabrication methods'. These methods abstract geometric and physical features of a given shape to create an unconventional representation, to produce an optical illusion or to devise a particular interaction with the fabricated model. In this state-of-the-art report, we classify and overview this broad and emerging class of approaches and also propose possible directions for future research.Source: COMPUTER GRAPHICS FORUM (PRINT), vol. 37 (issue 6), pp. 325-342
Project(s): EMOTIVE
See at:
CNR IRIS | onlinelibrary.wiley.com | ISTI Repository | CNR IRIS | CNR IRIS
2018
Other
Metadata Only Access
Metamolds: Computational design of silicone molds
Alderighi T, Malomo L, Giorgi D, Pietroni N, Bickel B, Cignoni P
We propose a new method for fabricating digital objects through reusable silicone molds. Molds are generated by casting liquid silicone into custom 3D printed containers called metamolds. Metamolds automatically define the cuts that are needed to extract the cast object from the silicone mold. The shape of metamolds is designed through a novel segmentation technique, which takes into account both geometric and topological constraints involved in the process of mold casting. Our technique is simple, does not require to change the shape or topology of the input objects, and only requires off-the-shelf materials and technologies. We successfully tested our method on a set of challenging examples with complex shapes and rich geometric detail.Project(s): EMOTIVE
Alderighi T, Malomo L, Giorgi D, Pietroni N, Bickel B, Cignoni P
We propose a new method for fabricating digital objects through reusable silicone molds. Molds are generated by casting liquid silicone into custom 3D printed containers called metamolds. Metamolds automatically define the cuts that are needed to extract the cast object from the silicone mold. The shape of metamolds is designed through a novel segmentation technique, which takes into account both geometric and topological constraints involved in the process of mold casting. Our technique is simple, does not require to change the shape or topology of the input objects, and only requires off-the-shelf materials and technologies. We successfully tested our method on a set of challenging examples with complex shapes and rich geometric detail.Project(s): EMOTIVE
See at:
CNR IRIS
2018
Journal article
Open Access
FlexMaps: computational design of flat flexible shells for shaping 3D objects
Malomo L, Pérez J, Iarussi E, Pietroni N, Miguel E, Cignoni P, Bickel B
We propose FlexMaps, a novel framework for fabricating smooth shapes out of flat, flexible panels with tailored mechanical properties. We start by mapping the 3D surface onto a 2D domain as in traditional UV mapping to design a set of deformable flat panels called FlexMaps. For these panels, we design and obtain specific mechanical properties such that, once they are assembled, the static equilibrium configuration matches the desired 3D shape. FlexMaps can be fabricated from an almost rigid material, such as wood or plastic, and are made flexible in a controlled way by using computationally designed spiraling microstructures.Source: ACM TRANSACTIONS ON GRAPHICS, vol. 37 (issue 6)
Project(s): EMOTIVE, MATERIALIZABLE
Malomo L, Pérez J, Iarussi E, Pietroni N, Miguel E, Cignoni P, Bickel B
We propose FlexMaps, a novel framework for fabricating smooth shapes out of flat, flexible panels with tailored mechanical properties. We start by mapping the 3D surface onto a 2D domain as in traditional UV mapping to design a set of deformable flat panels called FlexMaps. For these panels, we design and obtain specific mechanical properties such that, once they are assembled, the static equilibrium configuration matches the desired 3D shape. FlexMaps can be fabricated from an almost rigid material, such as wood or plastic, and are made flexible in a controlled way by using computationally designed spiraling microstructures.Source: ACM TRANSACTIONS ON GRAPHICS, vol. 37 (issue 6)
Project(s): EMOTIVE
, MATERIALIZABLE
See at:
dl.acm.org | CNR IRIS | ISTI Repository | CNR IRIS | CNR IRIS
2018
Conference article
Open Access
Reconstructing power lines from images
Ganovelli F, Malomo L, Scopigno R
We present a method for reconstructing overhead power lines from images. The solution to this problem has a deep impact over the strategies adopted to monitor the many thousand of kilometers of power lines where nowadays the only effective solution requires a high-end laser scanner. The difficulty with image based algorithms is that images of wires of the power lines typically do not have point features to match among different images. We use a Structure from Motion algorithm to retrieve the approximate camera poses and then formulate a minimization problem aimed to refine the camera poses so that the image of the wires project consistently on a 3D hypothesis.
Ganovelli F, Malomo L, Scopigno R
We present a method for reconstructing overhead power lines from images. The solution to this problem has a deep impact over the strategies adopted to monitor the many thousand of kilometers of power lines where nowadays the only effective solution requires a high-end laser scanner. The difficulty with image based algorithms is that images of wires of the power lines typically do not have point features to match among different images. We use a Structure from Motion algorithm to retrieve the approximate camera poses and then formulate a minimization problem aimed to refine the camera poses so that the image of the wires project consistently on a 3D hypothesis.
See at:
CNR IRIS | ieeexplore.ieee.org | ISTI Repository | CNR IRIS | CNR IRIS
2018
Conference article
Open Access
The EMOTIVE Project - Emotive virtual cultural experiences through personalized storytelling
Katifori A, Roussou M, Perry S, Cignoni P, Malomo L, Palma G, Dretakis G, Vizcay S
This work presents an overview of the EU-funded project EMOTIVE (Emotive virtual cultural experiences through personalized storytelling). EMOTIVE works from the premise that cultural sites are, in fact, highly emo- tional places, seedbeds not just of knowledge, but of emotional resonance and human connection. From 2016-2019, the EMOTIVE consortium will research, design, develop and evaluate methods and tools that can support the cultural and creative industries in creating narratives and experiences which draw on the power of 'emotive storytelling', both on site and virtually. This work focuses on the project objectives and results so far and presents identified challenges.Source: CEUR WORKSHOP PROCEEDINGS, pp. 11-20. Nicosia, Cyprus, November 3, 2018
Project(s): EMOTIVE
Katifori A, Roussou M, Perry S, Cignoni P, Malomo L, Palma G, Dretakis G, Vizcay S
This work presents an overview of the EU-funded project EMOTIVE (Emotive virtual cultural experiences through personalized storytelling). EMOTIVE works from the premise that cultural sites are, in fact, highly emo- tional places, seedbeds not just of knowledge, but of emotional resonance and human connection. From 2016-2019, the EMOTIVE consortium will research, design, develop and evaluate methods and tools that can support the cultural and creative industries in creating narratives and experiences which draw on the power of 'emotive storytelling', both on site and virtually. This work focuses on the project objectives and results so far and presents identified challenges.Source: CEUR WORKSHOP PROCEEDINGS, pp. 11-20. Nicosia, Cyprus, November 3, 2018
Project(s): EMOTIVE
See at:
ceur-ws.org | CNR IRIS | ISTI Repository | CNR IRIS
2019
Other
Open Access
SOROS: Sciadro online reconstruction by odometry and stereo-matching
Ganovelli F, Malomo L, Scopigno R
In this report we show how to interactively create 3D models for scenes seen by a common off-the-shelf smartphone. Our approach combines Visual Odometry with IMU sensors in order to achieve interactive 3D reconstruction of the scene as seen from the camera.
Ganovelli F, Malomo L, Scopigno R
In this report we show how to interactively create 3D models for scenes seen by a common off-the-shelf smartphone. Our approach combines Visual Odometry with IMU sensors in order to achieve interactive 3D reconstruction of the scene as seen from the camera.
See at:
CNR IRIS | ISTI Repository | CNR IRIS