Seoul National University

Other

Fxgear Inc.

Physan, Inc.

Hyeong-Seok Ko

Oh-Young Song

Doyub Kim

Kwang-Jin Choi

Ilhoe Jung

Ig-Jae Kim

Byoungwon Choe

Moonhwan Jeong

Dongwook Yoon

Hyuncheol Shin

An automatic 3D garment construction is provided using steps for: providing a plurality of panels of a garment so as to be processed in an information processing device, wherein each of the plurality of panels comprises seam lines; positioning the plurality of panels at corresponding locations around a virtual body provided in the information processing device; finding matching seam lines for the plurality of panels and creating seams; and producing the garment in which the plurality of panels are positioned, seamed, and draped on the virtual body. The step for positioning may comprise a step for panel tagging, a step for seam line tagging, and a step for panel packing, in which related panels are grouped and packed, such that relative positions are fixed among the packed panels, and the packed panels move as a group.

Automatic 3D garment construction from tagged cloth panels

An automatic garment grading is provided. A retargeting technique is used with the mediator and the correspondence function. The mediator is a parameterized draft. Local coordinates systems are used for making correspondence. The mean value coordinates system (MVC) are improved so that the weights would have positive values, which is omitted mean value coordinates (OMVC). The mediator is parameterized draft, and correspondence function is the OMVC in the method. Smart grading can minimize designer's specialized know-how and save performing time for the grading of real garment and virtual garment.

Method of smart grading based on parameterized draft

A simple and efficient method for simulating dispersed bubble flow is provided. Instead of modeling the complex hydrodynamics of numerous small bubbles explicitly, the method approximates the average motion of these bubbles using a continuum multiphase solver. The subgrid interactions among bubbles are computed using a new stochastic solver. Using the proposed scheme, complex scenes with millions of bubbles can be simulated efficiently.

Method for simulating dispersed bubble flow

A new method for the identification of body landmarks from three-dimensional (3D) human body scans without human intervention is provided. The method is based on a population in whom landmarks were identified and from whom 3D geometries were obtained. An unmarked body (subject) is landmarked if there is a landmarked body in the population whose geometry is similar to that of the subject. The similarity between the surface geometry of the subject and that of each individual in the population can be determined. A search is performed using the mesh registration technique to find a part-mesh with the least registration error; the landmarks of the best-matched result are then used for the subject.

Method for population-driven identification of body landmarks

A method for simulating the stretching and wiggling of liquids is provided. The complex phase-interface dynamics is effectively simulated by introducing the Eulerian vortex sheet method, which focuses on the vorticity at the interface and is extended to provide user control for the production of visual effects. The generated fluid flow creates complex surface details, such as thin and wiggling fluid sheets. To capture such high-frequency features efficiently, a denser grid is used for surface tracking in addition to coarser simulation grid. A filter, called the liquid-biased filter, is used to downsample the surface in the high-resolution grid into the coarse grid without unrealistic volume loss resulting from aliasing error.

Method for simulating stretching and wiggling liquids

Deformations occurring in cloth can be decomposed into two components: the in-plane and the out-of-plane deformations. Stretch and shear are in-plane deformation, and bending is out-of-plane deformation. In the method, the numerical simulation can be done in real-time, and the models fix some flaws that existed in previous real-time models, leading to conspicuous reduction of artifacts. The (|x|&#x2212;C)in the energy function is replaced with |x&#x2212;x*|for some constant vector x*, such that the force Jacobian becomes a constant, which obviates solving the large system of linear equations at every time step. The method uses simplified physical models for both edge-based and triangle-based systems.

Method of cloth simulation using linear stretch/shear model

A new constrained interpolation profile method, which is stable and accurate but requires less amount of computation, is provided. CIP is a high-order fluid advection solver that can reproduce rich details of fluids. It has third-order accuracy but its computation is performed over a compact stencil. A novel modification of the original CIP method that fixes all of the above problems without increasing the computational load or reducing the accuracy is provided. The proposed method brings significant improvements in both accuracy and speed.

Semi-Lagrangian CIP fluid solver without dimensional splitting

A method for graphically simulating stable but non-dissipative water in real-time includes steps for modeling multiphase materials with grid of nodes, suppressing numerical dissipation for getting rid of loss of mass of material, and suppressing numerical diffusion for reducing dampening of the fluid motion of materials in liquid phase. The step of modeling multiphase materials includes steps of describing liquid and gas with a set of nonlinear partial differential equations, representing the liquid-gas interface as an implicit surface, and determining properties of the materials, from the information about the liquid-gas interface, including the surface curvature and the surface tension. The set of nonlinear partial differential equations includes multiphase incompressible Navier-Stokes equations. The step of representing the liquid-gas interface includes a level set method.

Method for simulating stable but non-dissipative water

The method provides a new fluid simulation technique that significantly reduces the non-physical dissipation of velocity using particles and derivative information. In solving the conventional Navier-Stokes equations, the method replace the advection part with a particle simulation. When swapping between the grid-based and particle-based simulators, the physical quantities such as the level set and velocity must be converted. A novel dissipation-suppressing conversion procedure that utilizes the derivative information stored in the particles as well as in the grid points is developed. Through several experiments, the proposed technique can reproduce the detailed movements of high-Reynolds-number fluids, such as droplets/bubbles, thin water sheets, and whirlpools. The increased accuracy in the advection, which forms the basis of the proposed technique, can also be used to produce better results in larger scale fluid simulations.

Method of simulating detailed movements of fluids using derivative particles

In blendshape-based facial animation, two main approaches are used to create the key expressions: manual sculpting and statistically-based techniques. Hand-generated expressions have the advantage of being intuitively recognizable, thus allowing animators to use conventional keyframe control. However, they may cover only a fraction of the expression space, resulting in large reproduction animation errors. On the other hand, statistically-based techniques produce eigenfaces that give minimal reproduction errors but are visually non-intuitive. In the invention the applicants propose a technique to convert a given set of hand-generated key expressions into another set of so-called quasi-eigen faces. The resulting expressions resemble the original hand-generated expressions, but have expression space coverages more like those of statistically generated expression bases. The effectiveness of the proposed technique is demonstrated by applying it to hand-generated expressions.

Method for generating intuitive quasi-eigen faces

A method of simulating the movement of cloth and a computer-readable medium storing a program which executes the method of simulating the movement of cloth, wherein cloth deformation by compressive force is simulated by an immediate buckling model when the compressive force is applied to two extremities of a deformation unit which models the cloth, cloth deformation by stretching is simulated by a spring model, and hysteresis phenomenon of cloth is simulated by using spring-slips for modeling. The immediate buckling model is based on a model of the present invention in which a deformation unit is not contracted by compressive force and generates an immediate bending deformation. As for the compressive force and stretching, simulation is implemented by separate models, hysteresis phenomenon of cloth is simulated by use of spring-clips for modeling, whereby cloth characteristics can be well reflected and the buckling instability of cloth caused by compressive force can be solved, thereby increasing the simulation speed.

Method of simulating movement of cloth and computer readable media for the same

A method for graphical hairstyle generation presents an interactive technique that produces static hairstyles by generating individual hair strands of the desired shape and color, subject to the presence of gravity and collisions. A variety of hairstyles can be generated by adjusting the wisp parameters while the deformation is solved efficiently accounting for the effects of gravity and collisions. Wisps are generated employing statistical approaches. As for hair deformation, a method is used based on physical simulation concepts but is simplified to efficiently solve the static shape of hair. On top of the statistical wisp model and the deformation solver, a constraint-based styler models artificial features that oppose the natural flow of hair under gravity and hair elasticity, such as a hairpin. Our technique spans a wider range of human hairstyles than previously proposed methods, and the styles generated by this technique are pretty realistic.

Growing community of inventors

Seoul, South Korea

Hyeong-Seok Ko