Stitch meshes for modeling knitted clothing with yarn-level detail

Abstract

Figure 1: Stages of our knitted garment modeling system: (a) We begin our interactive modeling process with a polygonal mesh that specifies the global shape of the cloth model; (b) using this polygonal mesh we produce a high-resolution stitch mesh that serves as a canvas-like abstraction of the yarn model; (c) then, we specify the desired knitting pattern over the stitch mesh's surface. (d) Following the interactive modeling process, the model goes through offline relaxation, beginning with a mesh-based relaxation that moves the stitch mesh to the subdivision surface of the input model and slides its vertices over this surface based on the topology of the knitting pattern; finally, (e) we generate the yarn curves and (f) use a physically based relaxation process at the yarn level to compute the final realistic shape. AbstractRecent yarn-based simulation techniques permit realistic and efficient dynamic simulation of knitted clothing, but producing the required yarn-level models remains a challenge. The lack of practical modeling techniques significantly limits the diversity and complexity of knitted garments that can be simulated. We propose a new modeling technique that builds yarn-level models of complex knitted garments for virtual characters. We start with a polygonal model that represents the large-scale surface of the knitted cloth. Using this mesh as an input, our interactive modeling tool produces a finer mesh representing the layout of stitches in the garment, which we call the stitch mesh. By manipulating this mesh and assigning stitch types to its faces, the user can replicate a variety of complicated knitting patterns. The curve model representing the yarn is generated from the stitch mesh, then the final shape is computed by a yarn-level physical simulation that locally relaxes the yarn into realistic shape while preserving global shape of the garment and avoiding "yarn pull-through," thereby producing valid yarn geometry suitable for dynamic simulation. Using our system, we can efficiently create yarn-level models of knitted clothing with a rich variety of patterns that would be completely impractical to model using traditional techniques. We show a variety of example knitting patterns and full-scale garments produced using our system.

Anisotropic elastoplasticity for cloth, knit and hair frictional contact

“…We can even simulate multiple threads per yarn. We use the mesh models from Cirio et al [2014] and Yuksel et al [2012] and simulate different examples including dropping a sweater (Figure 7), a jumping character wearing a poncho ( Figure 17), twisting a knitted cloth with a cylinder ( Figure 5), and hitting a knitted cloth curtain with a ball (Figure 14). By accurately capturing frictional contact between yarns, our method naturally reproduces anisotropic stretching behaviors governed by knit patterns ( Figure 15).…”

Knitting for heart valve tissue engineering

“…Another important consideration is that to develop challenging geometries, the equipment needs to be controlled by cutting edge software. Important breakthrough research on modeling knitted clothing with yarn-level detail was presented by Yuksel and colleagues in 2012 49 .…”

Knittable Stitch Meshes

“…This is particularly important for knitted cloth, as it often exhibits complex yarn-level deformations. The challenging problem of designing yarn-level knitted cloth models is solved by the stitch mesh modeling framework (Yuksel et al 2012). Stitch meshes provide a full 3D modeling interface for knits with a collection of high-level and low-level modeling operations that allow designing arbitrary knitting patterns, including complex constructs like knitted cables.…”

“…• Knittable Mismatched Directions: four different (including two novel) types of mismatched knitting directions that are needed for designing complex 3D forms and the corresponding automated modifications to the stitch mesh structure for ensuring that they are knittable • Short Rows: a novel structure required for representing short rows within the stitch mesh modeling framework • An algorithm for generating step-by-step knitting instructions from a given knittable stitch mesh Thus, we extend the concept of stitch mesh modeling for designing more complex 3D models and for producing knittable structures that can be fabricated via knitting. As long as the input mesh can be completely labeled (using the labeling process of the stitch mesh modeling framework (Yuksel et al 2012)) and thus can be converted to a stitch mesh, we guarantee that it can be converted to a knittable stitch mesh using our approach. To verify that our results are knittable, we also developed a graphics interface for aiding a knitter by providing step-by-step instructions.…”