Printing-on-Fabric Meta-Material for Self-Shaping Architectural Models

International audienceWe describe a new meta-material for fabricating lightweight architectural models, consisting of a tiled plastic star pattern layered over pre-stretched fabric, and an interactive system for computer-aided design of doubly-curved forms using this meta-material. 3D-printing plastic rods over pre-stretched fabric recently gained popularity as a low-cost fabrication technique for complex free-form shapes that automatically lift in space. Our key insight is to focus on rods arranged into repeating star patterns, with the dimensions (and hence physical properties) of the individual pattern elements varying over space. Our star-based meta-material on the one hand allows effective form-finding due to its low-dimensional design space, while on the other is flexible and powerful enough to express large-scale curvature variations. Users of our system design free-form shapes by adjusting the star pattern; our system then automatically simulates the complex physical coupling between the fabric and stars to translate the design edits into shape variations. We experimentally validate our system and demonstrate strong agreement between the simulated results and the final fabricated prototypes

Star-Shaped Metrics for Mechanical Metamaterial Design

Special issue, SIGGRAPH 2019International audienceWe present a method for designing mechanical metamaterials based on the novel concept of Voronoi diagrams induced by star-shaped metrics. As one of its central advantages, our approach supports interpolation between arbitrary metrics. This capability opens up a rich space of structures with interesting aesthetics and a wide range of mechanical properties, including isotropic, tetragonal, orthotropic, as well as smoothly graded materials. We evaluate our method by creating large sets of example structures, provided as accompanying material. We validate the mechanical properties predicted by simulation through tensile tests on a set of physical prototypes

Elastic Rods for Fluid Dance Movements Modeling

National audienceWe present a new abstract representation of choreographic motion that conveys the typical fluidity of modern dances, such as those by Isadora Duncan, better than traditional human-like or skeleton-based representations. Our model is formed by five flexible ribbons joining at the solar plexus and is animated from motion capture data using a optimization-based algorithm

3D Design Of Ancient Garments

International audienc

Elastic Rods for Fluid Dance Movements Modeling

National audienceWe present a new abstract representation of choreographic motion that conveys the typical fluidity of modern dances, such as those by Isadora Duncan, better than traditional human-like or skeleton-based representations. Our model is formed by five flexible ribbons joining at the solar plexus and is animated from motion capture data using a optimization-based algorithm

3D Design Of Ancient Garments

International audience3D Modeling of this kind of draped clothes worn by a virtual human body is a particularly challenging task in computer graphics primarily due to the combined difficulty of creating layers of numerous fine folds and draping a person with a procedure quite different from dressing modern clothes. We propose a procedural approach for synthesizing a toga draped around a virtual body by starting from a flat fabric. We recreate visible and invisible folds as well as layers of the garment. This approach is composed into different stages inspired by movements made by roman people as they put on their toga. To adjust the toga to the morphology of the 3D model, we present a technique to create the mesh of the toga that adapts to certain parameters of the human body. Using a physical-based simulator allows us to reach our final goal: A 3D model wearing a realistic toga

Printing-on-Fabric Meta-Material for Self-Shaping Architectural Models

International audienceWe describe a new meta-material for fabricating lightweight architectural models, consisting of a tiled plastic star pattern layered over pre-stretched fabric, and an interactive system for computer-aided design of doubly-curved forms using this meta-material. 3D-printing plastic rods over pre-stretched fabric recently gained popularity as a low-cost fabrication technique for complex free-form shapes that automatically lift in space. Our key insight is to focus on rods arranged into repeating star patterns, with the dimensions (and hence physical properties) of the individual pattern elements varying over space. Our star-based meta-material on the one hand allows effective form-finding due to its low-dimensional design space, while on the other is flexible and powerful enough to express large-scale curvature variations. Users of our system design free-form shapes by adjusting the star pattern; our system then automatically simulates the complex physical coupling between the fabric and stars to translate the design edits into shape variations. We experimentally validate our system and demonstrate strong agreement between the simulated results and the final fabricated prototypes

Computational Design of Self-Actuated Surfaces by Printing Plastic Ribbons on Stretched Fabric

International audienceWe introduce a new mechanism for self-actuating deployable structures, based on printing a dense pattern of closely-spaced plastic ribbons on sheets of pre-stretched elastic fabric. We leverage two shape-changing effects that occur when such an assembly is printed and allowed to relax: first, the incompressible plastic ribbons frustrate the contraction of the fabric back to its rest state, forcing residual strain in the fabric and creating intrinsic curvature. Second, the differential compression at the interface between the plastic and fabric layers yields a bilayer effect in the direction of the ribbons, making each ribbon buckle into an arc at equilibrium state and creating extrinsic curvature. We describe an inverse design tool to fabricate low-cost, lightweight prototypes of freeform surfaces using the controllable directional distortion and curvature offered by this mechanism. The core of our method is a parameterization algorithm that bounds surface distortions along and across principal curvature directions, along with a pattern synthesis algorithm that covers a surface with ribbons to match the target distortions and curvature given by the aforementioned parameterization. We demonstrate the flexibility and accuracy of our method by fabricating and measuring a variety of surfaces, including nearly-developable surfaces as well as surfaces with positive and negative mean curvature, which we achieve thanks to a simple hardware setup that allows printing on both sides of the fabric

Computational Design of Laser-Cut Bending-Active Structures

Best Paper Award at Solid and Physical Modeling 2022International audienceWe propose a method to automatically design bending-active structures, made of wood, whose silhouettes at equilibrium match desired target curves. Our approach is based on the use of a parametric pattern that is regularly laser-cut on the structure and that allows us to locally modulate the bending stiffness of the material. To make the problem tractable, we rely on a two-scale approach where we first compute the mapping between the average mechanical properties of periodically laser-cut samples of mdf wood, treated here as metamaterials, and the stiffness parameters of a reduced 2D model; then, given an input target shape, we automatically select the parameters of this reduced model that give us the desired silhouette profile. We validate our method both numerically and experimentally by fabricating a number of full scale structures of varied target shapes