Photonic Rendering for Hair Cuticles using High Accuracy NS-FDTD method
Photonic Rendering for Hair Cuticles using High Accuracy NS-FDTD method
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DOI：
10.1145/3450623.3464678
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Zhuo Hou;DongSheng Cai;Ran Dong
中科院分区：
文献类型：
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作者：
Zhuo Hou;DongSheng Cai;Ran Dong
头发的内部结构由三层组成：角质层、皮质和髓质，角质层内部有多个膜结构。入射到这些亚波长结构上的光受到散射和干涉现象的影响，并且反射的高光根据视角而变化。这种由微结构引起的光着色现象称为结构着色或光子着色。它显示了一个独特的镜面高光，并确定了镜面高光的大小，这是在CG的线性光学中不可观察的。在毛发的情况下，除了简单的表面反射和反向散射光之外，还发生这种结构着色或光子着色，其穿透毛发并被黑色素吸收。在本报告中，我们主要讨论的结构着色首先引起的角质层区域的头发表面的多层结构，模拟电磁场使用NS-FDTD（非标准时域有限差分）方法。此外，我们还讨论了头发纤维内部的后向散射现象。
The internal structure of hair consists of three layers: the cuticle, the cortex, and the medulla, and there are multiple membrane structures inside the cuticle. Light incident on these subwavelength structures is subject to scattering and interference phenomena, and the reflected highlights vary depending on the viewing angle. This phenomenon of light coloration due to the microstructure is called structural coloring or photonic coloration. It shows a unique specular highlight and determines the magnitude of the specular highlight, which is not observable in the linear optics of CG. In the case of hairs, this structural coloring or photonic coloration occurs in addition to the simple surface reflections and the backscattering lights, which penetrate the hair and are absorbed by the melanin pigment. In the present report, we mainly discuss the effects of the structural coloring first caused by the multi-layered structure in the cuticle region on the hair surface, simulating the electromagnetic field using the NS-FDTD (Non-Standard Finite Difference in Time Domain) method. In addition, we also discuss the backscattering phenomena inside the hair fibers.