Efficient simulation of knitted cloth using persistent contacts

Abstract

Figure 1: Yarn-level simulation of a knitted sweater with 56K loops (220K contact nodes, 1.1M DoFs), computed at 1.5 minutes per frame. Our model captures robustly and efficiently both the fine-and large-scale mechanics of knitted cloth. AbstractKnitted cloth is made of yarns that are stitched in regular patterns, and its macroscopic behavior is dictated by the contact interactions between such yarns. We propose an efficient representation of knitted cloth at the yarn level that treats yarn-yarn contacts as persistent, thereby avoiding expensive contact handling altogether. We introduce a compact representation of yarn geometry and kinematics, capturing the essential deformation modes of yarn loops and stitches with a minimum cost. Based on this representation, we design force models that reproduce the characteristic macroscopic behavior of knitted fabrics. We demonstrate the efficiency of our method on simulations with millions of degrees of freedom (hundreds of thousands of yarn loops), almost one order of magnitude faster than previous techniques.

Sparse GPU Voxelization of Yarn‐Level Cloth

“…Our algorithm has been successfully used to generate all the renderings in the cloth simulation work by Cirio et al [CLMMO14, CLMO15],. and from this experience we believe that it has a great potential to simulate complex visual aspects of the cloth under deformations.…”

“…Our volumetric textures are translated into an offline format with one byte for density and two bytes for orientation (discrete polar coordinates θ and φ). The animations and videos of our cloth simulation works [CLMMO14,CLMO15] were also generated in the same fashion, demonstrating that our method is suitable for the generation of temporally coherent results.…”

“…We use single byte images, while atomic math for images is limited to GL_R32I and GL_R32UI integer types. Our policy for the composition of orientations might introduce some temporal or inter‐frame incoherence, but we have shown the feasibility of our approach in animations [CLMMO14, CLMO15].…”

“…Cloth simulation and rendering is an active research field. In the last two decades, we have witnessed how simulation models have evolved from mass‐spring networks on triangle meshes [BHW94, Pro95] or finite‐element discretizations of continuum models [EKS03], to the computation of highly detailed physical interactions at the yarn level [KJM08, MBCN09, KJM10, CLMMO14, CLMO15].…”

Cloth Simulation with Adaptive Force Model in Three-Dimensional Space

“…Table II, the desired blocks of the clothing can be computed and illustrated, as shown in Figure 4. From Figure 4, it is obvious that the shapes of different blocks vary accordingly Compared to the conventional methods like triangulated surfaces in [2], the proposed scheme forms different and irregular shapes since the block is a continuous area expressed in Eq. (1) constrained by the lower and upper range values in Table II.…”