实时虚拟服装渲染系统

发布时间：2018-12-13 23:05

【摘要】：随着电子商务的发展,服装在线销售量快速增长。然而服装的退货率却居高不下,尺码问题、色差以及用户预期等问题催生了虚拟试衣技术。近年来GPU通用计算能力的不断加强给虚拟试衣技术的发展带来了前所未有的机遇。为了获取更真实的虚拟服装视觉体验,渲染提供的光学特性尤为重要。本文研发了一个实时的虚拟服装渲染系统。本系统充分利用GPU的并行计算能力,在光线跟踪的基础框架上,使用基于微圆柱体的表面模型来渲染布料。该模型通过分别建模不同方向纱线的双向反射分布函数(BSDF)以及布料纱线的编织模式,产生布料各向异性的光学特性,能模拟如尼龙、丝绸、涤纶、绒等不同材质。由于此模型使用较少而直观的参数,所以速度上也可以满足实时渲染的需求。本系统基于实际需求对此模型做了阴影衰减和掠射角高光的修正。然后再结合通用的渲染技术,包括使用法向贴图和浮雕贴图丰富服装表面褶皱细节,使用环境光遮蔽、颜色渗透模拟全局光照,使用双向投射分布函数(BTDF)表现蕾丝、雪纺等半透明材质。在服装渲染的基础上,创新性地将真实的人体照片与虚拟的服装完美地结合在一起,实现了逼真的模特试穿虚拟服装的效果。实验结果表明,本文的渲染系统能够快速得到模特试穿虚拟服装效果,达到以假乱真的目的,以满足在商业环境下的实时服装渲染需求。
[Abstract]:With the development of e-commerce, the online sales of clothing is increasing rapidly. However, the return rate of clothing is high, size problems, color aberration and user expectations have led to virtual fitting technology. In recent years, the development of virtual fitting technology has brought unprecedented opportunities with the continuous enhancement of GPU's general computing power. In order to obtain a more realistic visual experience of virtual clothing, the optical properties provided by rendering are particularly important. A real-time virtual garment rendering system is developed in this paper. This system makes full use of the parallel computing ability of GPU and uses the surface model based on microcylinder to render cloth on the basic frame of ray tracing. By modeling the bidirectional reflectance distribution function (BSDF) of yarns in different directions and the braiding mode of fabric yarns respectively, the model can produce anisotropic optical properties of cloth, and can simulate different materials such as nylon, silk, polyester, velvet and so on. Because this model uses fewer and more visual parameters, it can also meet the need of real-time rendering. The model is modified by shadow attenuation and glare angle based on actual requirements. Then combined with the general rendering technology, including the use of normal mapping and relief map rich clothing surface fold details, using ambient light masking, color penetration simulation global lighting, using the bidirectional projection distribution function (BTDF) to represent lace, Translucent material such as chiffon. On the basis of clothing rendering, the real human body photos are innovatively combined with the virtual clothes to realize the effect of the realistic models trying on the virtual clothes. The experimental results show that the rendering system in this paper can quickly get the model to try on the effect of virtual clothing, achieve the purpose of false and true, in order to meet the needs of real-time clothing rendering in the commercial environment.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TS941

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