End-to-End Paired Ambisonic-Binaural Audio Rendering

Binaural rendering is of great interest to virtual reality and immersive media. Although humans can naturally use their two ears to perceive the spatial information contained in sounds, it is a challenging task for machines to achieve binaural rendering since the description of a sound field often requires multiple channels and even the metadata of the sound sources. In addition, the perceived sound varies from person to person even in the same sound field. Previous methods generally rely on individual-dependent head-related transferred function(HRTF)datasets and optimization algorithms that act on HRTFs. In practical applications, there are two major drawbacks to existing methods. The first is a high personalization cost, as traditional methods achieve personalized needs by measuring HRTFs. The second is insufficient accuracy because the optimization goal of traditional methods is to retain another part of information that is more important in perception at the cost of discarding a part of the information. Therefore, it is desirable to develop novel techniques to achieve personalization and accuracy at a low cost. To this end, we focus on the binaural rendering of ambisonic and propose 1) channel-shared encoder and channel-compared attention integrated into neural networks and 2) a loss function quantifying interaural level differences to deal with spatial information. To verify the proposed method, we collect and release the first paired ambisonic-binaural dataset and introduce three metrics to evaluate the content information and spatial information accuracy of the end-to-end methods. Extensive experimental results on the collected dataset demonstrate the superior performance of the proposed method and the shortcomings of previous methods.

A Fast and Memory-Efficient Direct Rendering Method for Polynomial-Based Implicit Surfaces

Three-dimensional surfaces are typically modeled as implicit surfaces.However,direct rendering of implicit surfaces is not simple,especially when such surfaces contain finely detailed shapes.One approach is ray-casting,where the field of the implicit surface is assumed to be piecewise polynomials defined on the grid of a rectangular domain.A critical issue for direct rendering based on ray-casting is the computational cost of finding intersections between surfaces and rays.In particular,ray-casting requires many function evaluations along each ray,severely slowing the rendering speed.In this paper,a method is proposed to achieve direct rendering of polynomial-based implicit surfaces in real-time by strategically narrowing the search range and designing the shader to exploit the structure of piecewise polynomials.In experiments,the proposed method achieved a high framerate performance for different test cases,with a speed-up factor ranging from 1.1 to 218.2.In addition,the proposed method demonstrated better efficiency with high cell resolution.In terms of memory consumption,the proposed method saved between 90.94%and 99.64%in different test cases.Generally,the proposed method became more memory-efficient as the cell resolution increased.

经阴道超声联合3D-TVS Render成像诊断子宫内膜病变的临床价值分析

目的分析经阴道超声联合三维超声(3D-TVS)Render成像诊断子宫内膜病变的临床价值。方法回顾性分析2019年11月至2022年11月我院收治的123例子宫内膜病变患者的临床资料,术前或诊刮前均行经阴道超声、3D-TVS Render成像检查,以病理检查结果作为“金标准”,分析经阴道超声联合3D-TVS Render成像对子宫内膜病变的诊断价值。结果经病理检查结果显示,123例患者中子宫内膜癌24例,子宫内膜良性病变99例;子宫内膜癌患者经阴道超声检查的子宫内膜厚度(ET)高于良性病变患者,经3D-TVS Render成像检查的子宫内膜血管指数(VI)、血流指数(FI)、血管血流指数(VFI)高于良性病变患者(P<0.05);绘制ROC曲线结果显示,ET、VI、FI、VFI联合诊断子宫内膜病变的AUC为0.968,高于各指标单独诊断。结论经阴道超声联合3D-TVS Render成像对子宫内膜病变的诊断价值较高,值得临床推广应用。

Research and Application of Caideng Model Rendering Technology for Virtual Reality

With the development of virtual reality (VR) technology, more and more industries are beginning to integrate with VR technology. In response to the problem of not being able to directly render the lighting effect of Caideng in digital Caideng scenes, this article analyzes the lighting model. It combines it with the lighting effect of Caideng scenes to design an optimized lighting model algorithm that fuses the bidirectional transmission distribution function (BTDF) model. This algorithm can efficiently render the lighting effect of Caideng models in a virtual environment. And using image optimization processing methods, the immersive experience effect on the VR is enhanced. Finally, a Caideng roaming interactive system was designed based on this method. The results show that the frame rate of the system is stable during operation, maintained above 60 fps, and has a good immersive experience.

Cinema 4D中Team Render的构建与实现

渲染是一种计算机图形图像生成技术,它以存储在计算机中的几何场景模型为基础,经过附加色彩、纹理及材质,并根据设定的光照条件及场景光照关系,计算生成具有高真实度的视景图像。实现3D动画渲染十分消耗计算机的性能,为了减少3D动画渲染所花费的时间,利用德国maxon公司Cinema 4D软件的Cinema 4D Team Render对3D动画进行分布式渲染测试。结果表明,此种方法确实可以成倍地减少3D动画渲染所花费的时间。

解析制图渲染软件lightscape和v-ray

随着计算机科技的迅猛发展,电脑效果图制作的真实性已成为现实.lightscape和v-ray以其出色的渲染性能和质量,大大提高了电脑效果图制作的品质.本篇文章着重介绍制图渲染软件lightscape和v-ray的技术特点和相关方法.

三维图形生成软件POV-RAY的原理及应用

本文介绍了一种国际上广泛采用的三维图形生成软件 POV- RAY。该软件是为学术研究和教学研制的 ,它是免费、公开原代码的基于光线跟踪原理软件包。本文介绍了该软件的特点、各项功能及与其他三维图形软件的区别。着重描述了场景描述语言的各部分结构 :头文件、照相机定义、光照定义、物体描述等。根据我们的使用认为 POV- RAY的功能齐全、使用方便。不但可以用于生成各种三维图形 。

V-Ray渲染器辅助下的建筑摄影教学

在以往建筑摄影教学中由于器材、场地等原因的限制,在初次讲授光圈、快门速度、景深、I S O值、曝光补偿等问题时无法将相关技术理论以形象、直观化的途径传达。借助虚拟数字环境下的V-Ray渲染器技术,借助软件内的虚拟相机对建筑数字模型场景的灯光渲染,能够有针对性的对摄影基本概念以形象直观的形式传递,使得学习过程趣味性增强,有助于学生与对特定技术问题的理解,促进建筑摄影教学活动的开展。

V-Ray 3.40 for Sketch Up对优化建筑设计阶段表达的意义探究

计算机辅助设计在建筑行业的普及,给建筑设计从业人员带来了史无前例的便捷性。建筑效果图作为建筑在设计表达阶段的一个重要组成部分,往往也给许多设计师带来了绘制上的困扰。V-Ray for Sketch Up的诞生在很大程度上方便了设计师的工作,它的存在使制作建筑效果图变得简单,让每一个设计师都能够自己参与进来。文章将从实际出发来探讨V-Ray 3.40 for Sketch Up在建筑设计中的应用,得出此软件会在一定程度上提高建筑设计工作者的工作效率的结论,具有一定的推广应用意义。

SPEEDING-UP RE-SAMPLED ALGORITHM IN RAY CASTING VOLUME RENDERING OF MEDICAL IMAGES

Ray casting algorithm can obtain a better quality image in volume rendering, however, it exists some problems, such as powerful computing capacity and slow rendering speed. How to improve the re-sampled speed is a key to speed up the ray casting algorithm. An algorithm is introduced to reduce matrix computation by matrix transformation characteristics of re-sampling points in a two coordinate system. The projection of 3-D datasets on image plane is adopted to reduce the number of rays. Utilizing boundary box technique avoids the sampling in empty voxel. By extending the Bresenham algorithm to three dimensions, each re-sampling point is calculated. Experimental results show that a two to three-fold improvement in rendering speed using the optimized algorithm, and the similar image quality to traditional algorithm can be achieved. The optimized algorithm can produce the required quality images, thus reducing the total operations and speeding up the volume rendering.

JSF中自定义分页呈现器(Render)的实现和应用

针对使用JSF构建的系统中经常遇到的大量的分页查询问题,结合JSF自定义呈现器组件技术实现分页查询呈现器,从而达到显示逻辑和业务逻辑的分离、代码重用以及易于维护的目的。

V-Ray与Iumion在效果图表现中的优劣分析

长期以来,V-Ray一直在效果图表现类软件中占据了主导地位。而Iumion近年来则在众多竞争软件中脱颖而出。本文从效果图制作的角度出发,从软件的学习成本、效果表现、渲染速度、硬件需求和发展潜力等多方面对比与分析了V-Ray与Iumion之间的异同与优劣。

基于V-Ray渲染器的玻璃材质的调节

介绍V-Ray渲染器的基本特点，分析玻璃的属性，在3Ds-Max建模的基础上，基于V—Rav渲染器探讨玻璃材质的调节，

这里的动词render用得对吗?

【问】[437]在《大学英语四级考试王长喜英语预测卷》(第六版)p．107上，参考作文范文Positive and Negative Efforts of Short Message Service(SMS)中，有以下一句：

Very-High Color Rendering Index Hybrid White Organic Light-Emitting Diodes with Double Emitting Nanolayers

A very-high color rendering index white organic light-emitting diode(WOLED) based on a simple structure was successfully fabricated. The optimized device exhibits a maximum total efficiency of 13.1 and 5.4 lm/W at 1,000 cd/m2. A peak color rendering index of 90 and a relatively stable color during a wide range of luminance were obtained. In addition, it was demonstrated that the 4,40,400-tri(9-carbazoyl) triphenylamine host influenced strongly the performance of this WOLED.These results may be beneficial to the design of both material and device architecture for high-performance WOLED.

A Mixed-Depth Visual Rendering Method for Bleeding Simulation

The visual fidelity of bleeding simulation in a surgical simulator is critical since it will affect not only the degree of visual realism,but also the user’s medical judgment and treatment in real-life settings.The conventional marching cubes surface rendering algorithm provides excellent visual effect in rendering gushing blood,however,it is insufficient for blood flow,which is very common in surgical procedures,since in this case the rendered surface and depth textures of blood are rough.In this paper,we propose a new method called the mixed depth rendering for rendering blood flow in surgical simulation.A smooth height field is created to minimize the height difference between neighboring particles on the bleeding surface.The color and transparency of each bleeding area are determined by the number of bleeding particles,which is consistent with the real visual effect.In addition,there is no much extra computational cost.The rendering of blood flow in a variety of surgical scenarios shows that visual feedback is much improved.The proposed mixed depth rendering method is also used in a neurosurgery simulator that we developed.

Cluster parallel rendering based on encoded mesh

Use of compressed mesh in parallel rendering architecture is still an unexplored area, the main challenge of which is to partition and sort the encoded mesh in compression-domain. This paper presents a mesh compression scheme PRMC (Parallel Rendering based Mesh Compression) supplying encoded meshes that can be partitioned and sorted in parallel rendering system even in encoded-domain. First, we segment the mesh into submeshes and clip the submeshes’ boundary into Runs, and then piecewise compress the submeshes and Runs respectively. With the help of several auxiliary index tables, compressed submeshes and Runs can serve as rendering primitives in parallel rendering system. Based on PRMC, we design and implement a parallel rendering architecture. Compared with uncompressed representation, experimental results showed that PRMC meshes applied in cluster parallel rendering system can dramatically reduce the communication requirement.

现代远程教育起重机械虚拟实验中V-Ray渲染器的应用探索

V-Ray渲染器是一款专业的3D渲染引擎,运用它可以生成质量高真实感强的图象。它由Chaos Group和Asgvis公司出品,在虚拟现实领域三维模型和后期材质的处理上得到了广泛的应用和认可。在场景中使用该渲染器能够获得更加准确的光能分布,获得更快的渲染速度,模拟光线的反射和折射更加逼真。在对V-Ray渲染器的特征及功能分析的基础上,从V-Ray渲染器应用于起重机械实验教学的基本原则及新技术对传统教学模式的影响等方面,探讨了V-Ray渲染器在起重机械实验课程教学中运用的技术路径及设计框架。

使用Light Field Rendering实现森林的实时渲染及光照算法

森林的实时渲染及光照是视景系统中的一个难题.基于图像的渲染方法(IBR)由于渲染速度与模型复杂度无关,被广泛应用于场景重建.基于光流场(Light Field Rendering)的IBR技术,提出一种迭代投射算法来进行外形重建,实现了具有实时光影特征的森林效果.实验表明该算法结合了传统迭代、投射算法各自的优点,在质量和效率方面取得了平衡.

Introducing Cinematic Rendering: A Novel Technique for Post-Processing Medical Imaging Data

Since the 1980s, various techniques have been used in the field of medicine for the post-processing of medical imaging data from computed tomography (CT) and magnetic resonance (MR). They include multiplanar reformations (MPR), maximum intensity projection (MIP) and Volume Rendering (VR). This paper presents the prototype of a new means of post-processing radiological examinations such as CT and MR, a technique that, for the first time, provides photorealistic visualizations of the human body. This new procedure was inspired by the quality of images achieved by animation software such as programs used in the entertainment industry, particularly to produce animated films. Thus, the name: Cinematic Rendering. It is already foreseeable that this new method of depiction will quickly be incorporated into the set of instruments employed in socalled virtual anatomy (teaching anatomy through the use of radiological depictions of the human body via X-ray, CT and MR in addition to the use of computer animation programs designed especially for human anatomy). Its potential for medical applications will have to be evaluated by future scientific investigations.