The Virtual Fabric Texture Perception Research

With the development of human-computer interaction in virtual reality, limited to the fabricdeformation and texture information of visual perception, which has been difficult to meet theincreasing demand, this paper improves the Mass-Spring model, and proposes an innovativefabric deformation model. In addition, combined with the fabric texture images, the tactilesensing algorithm with fabric texture is proposed, make the haptic rendering of texture image nolonger restricted to the rigid body. Most of the virtual fabric haptic sensing algorithm uses asingle HIP(Haptic Interaction Point), and it can’t simulate two fingers perception of fabricbehavior in real life, so we developed a virtual fabric haptic interactive prototype system ofdouble HIPs, it can realize the interaction of two fingers and perceive the virtual fabric of thesurface with texture, enable people to observe the deformation of the fabric, simultaneously withthe help of haptic interaction equipment, you can feel the virtual fabric elasticity and friction,concavo convex of texture, feel, etc. which enhances the interactive immersive.This paper first introduces the research meaning and purpose of the fabric texture and thevisual and haptic perception, analyses the current research status of fabric deformation, textureimage tactile rendering and virtual fabric interactive mode, and determines the researchobjectives and research contents. According to the scalability, bending and shear resistance andother physical properties of fabric, aiming at the existence of classical mass-spring model superelastic deformation and anisotropic problems, we improve the classical mass-spring model, andconsidering the fabric scalability, shear, bending and surface roughness, effectivelysolve anisotropy and super elasticity problems in the fabric simulation, and improve the realismof fabric deformation. Based on model, we carry out the mechanical analysis of proton, establishkinematics equation, and solve the proton position. On the proton position solution, we use theVerlet numerical method, Effectively balancing between speed and accuracy, and meet thereal-time demand of fabric deformation.Texture is an important attribute of fabric, gives people the unique visual and tactile feelingwith recognition. Use the SFS algorithm to extract the texture of3D information, and through theimage division algorithm based on color and spatial texture images, which can obtain different areas of texture images. According to the3D reconstruction and region partition based onthe texture images, we propose a3D texture mapping algorithm based on fabric deformation, add3D texture for fabric, and give a3D concavo-convex on the surface of the fabric and differentfeel based on the division. The result improve the consistency of the authenticity andvisual tactile about the virtual fabric tactile perception.This paper develops an interaction algorithm of double HIPs. This algorithm breakthroughthe limitation of single HIP interaction and makes the interaction of virtual fabric more close tothe actual. It is based on two HIPs and virtual interaction characteristics of the fabric, this paperused AABB axial bounding box tree collision detection methods of the fabric. This algorithm canimprove the efficiency of collision detection effectively and reduce collision detection time. Forthe existence of double HIPs interaction with a variety of contact states, developed thecorresponding tactile feedback force model, make the users experience more realistic texturefabric touching.Based on the above models and algorithms, this paper develops an fabric interaction systemwith double HIPs fabric. The simulation experiment is implemented. We simulate the behaviorof the two finger tips touch the fabric, it makes users observe the fabric deformation in theprocess of interaction, and feel elasticity, concave-convex and the regional frictional of thetexture of fabric. The experimental results certified that this paper can realize that using twoHIPS the fabric contact operation like two fingers. Also, this paper proved that the improvedspring proton model embodies the anisotropy of fabric and inhibition of the super elasticdeformation of the fabric and the surface texture of reduction of3D fabric not only with aconcave-convex of3D geometry but also can set up the corresponding frictional and elasticcoefficient of fabrics in different regions. Finally we can enrich the tactile experience of the userand more close to the actual.Based on the experiment results, compared with the present papers about some insufficient.To summarize the paper, we also need to improve some aspects we need a further study.