GAMES Webinar 2023 – 303期(Hair and Scratch Rendering) | 沈鹏飞(中国科学技术大学)，夏梦琪(洛桑联邦理工大学)
【GAMES Webinar 2023-303期】(绘制专题-Hair and Scratch Rendering)
报告题目：Scratch-based Reflection Art via Differentiable Rendering
The 3D visual optical arts create fascinating special effects by carefully designing interactions between objects and light sources. One of the essential types is 3D reflection art, which aims to create reflectors that can display different images when viewed from different directions. Existing works produce impressive visual effects. In this paper, we introduce a new type of 3D reflection art — scratch-based reflection art, which allows for a more compact parameter space, easier fabrication, and computationally efficient optimization. To design a 3D reflection art with scratches, we formulate it as a multi-view optimization problem and introduce differentiable rendering to enable efficient gradient-based optimizers. For that, we propose an analytical scratch rendering approach, together with a high-performance rendering pipeline, allowing efficient differentiable rendering. As a consequence, we could display multiple images on a single metallic board with only several minutes for optimization. We demonstrate our work by showing virtual objects and manufacturing our designed reflectors with a carving machine.
报告嘉宾：夏梦琪(洛桑联邦理工大学École Polytechnique Fédérale de Lausanne (EPFL))
报告题目：A Practical Wave Optics Reflection Model for Hair and Fur
In this work, we take an important step to study wave effects from rough fibers with arbitrary 3D microgeometry. We developed a 3D wave optics simulator based on a physical optics approximation, using a GPU-based hierarchical algorithm to greatly accelerate the calculation. It simulates surface reflection and diffractive scattering, which are present in all fibers and typically dominate for darkly pigmented fibers. To practically handle geometry variations in the scene, we propose a model based on wavelet noise, capturing the important statistical features in the simulation results that are relevant for rendering. Our compact noise model can be easily combined with existing scattering models to render hair and fur of various colors, introducing visually important colorful glints that were missing from all previous models.
Mengqi (Mandy) Xia is a Postdoc at the Realistic Graphics Lab at École Polytechnique Fédérale de Lausanne (EPFL), where she works with Prof. Wenzel Jakob on physically-based rendering and differentiable rendering. She received her Ph.D in Computer Science in 2022 from Cornell University, advised by Prof. Steve Marschner. Prior to this, she earned her bachelor’s degree in Applied Mathematics from the University of California, Los Angeles (UCLA). She is currently part of the WiGRAPH Rising Stars in Computer Graphics program. She also took part in 2020 Rising Stars in EECS, organized virtually by UC Berkeley.
王贝贝, 研究方向为计算机图形学渲染方向，研究主题聚焦于材质建模和高效渲染方法等。分别于2009年和2014年在山东大学获得学士和博士学位，曾在INRIA从事博士后研究。在计算机图形学领域期刊和会议上发表学术论文多篇。主持国家自然科学基金、科技创新2030—“新一代人工智能”重大项目子课题、省部级科研项目和公司的研发项目。作为骨干参与Disney游戏Infinity 3的研发，亮片材质实时渲染应用于该游戏中。担任SIGGRAPH 2023-2024、EG、EGSR、HPG程序委员会委员，中国图象图形学报青年编委。个人主页：https://wangningbei.github.io
GAMES主页的“使用教程”中有 “如何观看GAMES Webinar直播？”及“如何加入GAMES微信群？”的信息；