We consider the simulation of dense foams composed microscopic bubbles, such as shaving cream and whipped cream. represent foam not a collection discrete but instead continuum. employ material point method (MPM) to discretize hyperelastic constitutive relation augmented with Herschel-Bulkley model non-Newtonian viscoplastic flow, which is known closely approximate behavior. Since large shearing flows in can produce poor distributions points, typical MPM implementation non-physical internal...

Robotic manipulation of deformable objects remains a challenging task. One such task is folding garment autonomously. Given start and end positions, what an optimal trajectory to move the robotic arm fold garment? Certain trajectories will cause move, creating wrinkles, gaps, other fail altogether. We present novel solution find that avoids problematic scenarios. The optimized by minimizing quadratic objective function in off-line simulator, which includes material properties frictional...

We present a computational approach for designing wire meshes , i.e., freeform surfaces composed of woven wires arranged in regular grid. To facilitate shape exploration, we map material properties to the geometric model Chebyshev nets . This abstraction is exploited build an efficient optimization scheme. While theory suggests highly constrained design space, show that allowing controlled deviations from underlying surface provides rich space exploration. Our algorithm balances globally...

We propose a technique to simulate granular materials that exploits the dual strengths of discrete and continuum treatments. Discrete element simulations provide unmatched levels detail generality, but prove excessively costly when applied large scale systems. Continuum approaches are computationally tractable, limited in applicability due built-in modeling assumptions; e.g., models suitable for flows typically fail capture clogging, bouncing ballistic motion. In our hybrid approach, an...

Deformable objects such as garments are highly unstructured, making them difficult to recognize and manipulate. In this paper, we propose a novel method teach two-arm robot efficiently track the states of garment from an unknown state known by iterative regrasping. The problem is formulated constrained weighted evaluation metric for evaluating two desired grasping points during regrasping, which can also be used convergence criterion result then adopted estimation initialize considered new...

Building LEGO sculptures requires accounting for the target object's shape, colors, and stability. In particular, finding a good layout of bricks that prevents sculpture from collapsing (due to its own weight) is usually challenging, it becomes increasingly difficult as object larger or more complex. We devise force-based analysis estimating physical stability given sculpture. Unlike previous techniques Legolization, which typically use heuristic-based metrics estimation, our metric gives 1)...

Robotic manipulation of deformable objects is a difficult problem especially because the complexity many different ways an object can deform. Searching such high-dimensional state space makes it to recognize, track, and manipulate objects. In this paper, we introduce predictive, model-driven approach address challenge, using precomputed, simulated database models. Mesh models common garments are with picked up in multiple poses under gravity, stored for fast efficient retrieval. To validate...

Robotic manipulation of deformable objects remains a challenging task. One such task is to iron piece cloth autonomously. Given roughly flattened cloth, the goal have an ironing plan that can iteratively apply regular remove all major wrinkles by robot. We present novel solution analyze surface fusing two scan techniques: curvature and discontinuity scan. The estimate height deviation surface, while effectively detect sharp features, as wrinkles. use this information regions need be pulled...

The materials around us usually exist as mixtures of constituents, each constituent with possibly a different elasto-viscoplastic property. How can we describe the material property such mixture is core question this paper. We propose nonlinear blending model that capture intriguing flowing behaviors differ from individual constituents (Fig. 1). used laboratory device, rheometer , to measure properties various fluid-like foods, and found an elastic Herschel-Bulkley has nice agreements...

Generative models based on deep neural networks often have a high-dimensional latent space, ranging sometimes to few hundred dimensions or even higher, which typically makes them hard for user explore directly. We propose differential subspace search allow efficient iterative exploration in such without relying domain- data-specific assumptions. develop general framework extract low-dimensional subspaces local analysis of the generative model, that small change would provide enough resulting...

Realistic rendering of participating media is one the major subjects in computer graphics. Monte Carlo techniques are widely used for realistic because they provide unbiased solutions, which converge to exact solutions. Methods based on generate a number light paths, each consists set randomly selected scattering events. Finding new event requires free path sampling determine distance from previous event, and usually time-consuming process inhomogeneous media. To address this problem, we...

Clouds play an important role in creating realistic images of outdoor scenes. Many methods have therefore been proposed for displaying clouds. However, the realism resulting depends on many parameters used to render them and it is often difficult adjust those manually. This paper proposes a method addressing this problem by solving inverse rendering problem: given non-uniform synthetic cloud density distribution, clouds are estimated using photographs real The objective function defined as...

Realistic rendering of participating media is one the major subjects in computer graphics. Monte Carlo techniques are widely used for realistic because they provide unbiased solutions, which converge to exact solutions. Methods based on generate a number light paths, each consists set randomly selected scattering events. Finding new event requires free path sampling determine distance from previous event, and usually time-consuming process inhomogeneous media. To address this problem, we...

Abstract Pixel art is a kind of digital that through per‐pixel manipulation enables production diverse array artistic images. In this paper, we present new way for people to experience and express pixel art. Our consists set sticks made acrylate resin, each which refracts light from parallel source, in certain directions. Artistic users are able easily rearrange these view their the refracted projection on any planar surface. As demonstrate user can generate various images using only single...

Abstract Photo‐realistic rendering of inhomogeneous participating media with light scattering in consideration is important computer graphics, and typically computed using Monte Carlo based methods. The key technique such methods the free path sampling, which used for determining distance (free path) between successive events. Recently, it has been shown that efficient unbiased sampling can be constructed on Woodcock tracking. concept improving efficiency to utilize space partitioning (e.g.,...

Robotic manipulation of deformable objects remains a challenging task. One such task is folding garment autonomously. Given start and end positions, what an optimal trajectory to move the robotic arm fold garment? Certain trajectories will cause move, creating wrinkles, gaps, other fail altogether. We present novel solution find that avoids problematic scenarios. The optimized by minimizing quadratic objective function in off-line simulator, which includes material properties frictional...

Clouds play an important role when synthesizing realistic images of outdoor scenes. The display clouds is therefore one the research topics in computer graphics. In order to clouds, we need methods for modeling, rendering, and animating realistically. It also control shapes appearances create certain visual effects. this paper, explain our efforts results meet such requirements, together with related researches on simulation clouds.

In this paper, we propose a fast global illumination solution for interactive lighting design. Using our method, light sources and the viewpoint are movable, characteristics of materials can be modified (assuming low-frequency BRDF) during rendering. Our is based on particle tracing (a variation photon mapping) final gathering. We assume that objects in input scene static, pre-compute potential paths To perform gathering fast, an efficient technique called Hierarchical Histogram Estimation...