传统图形中共生现象的探究

传统设计元素与现代设计手法如何消除对峙,促进相互融合,一直是艺术设计界值得研究的问题。两者虽在表现形式上存在着一些差异,但它们的审美目的和创造性价值所传达出来的艺术信息是具有共性的,文章将传统图形中共生现象定为研究对象,探究其成因、特点、继承及影响,这将对于如何进一步尊重传统、发掘传统;如何继续深层次研究促使中国传统图形的在当代视觉传达中的应用,起到抛砖引玉的作用。     

视觉传达设计艺术中的怪诞图形

怪诞图形是西方现代艺术现代视觉传达的一个重要表现形式,它为现代视觉传达设计注入了新的血液,使现代视觉传达设计在形式上发生了根本改变。     

一种面向计算机辅助设计机房的建设与维护模式

计算机辅助设计机房作为艺术设计教学的重要实践基地,是学生应用各种图形软件完成设计构想的主要场所。建设一个以图形工作站为主体设备的机群并加以科学的维护,可以更好地让计算机科技服务于艺术设计,更直观和准确的完成艺术创想,同时提供一个良好的学习环境,保证机房的正常运行,提高计算机辅助设计教学的质量和效率。这种面向计算机辅助设计机房的建设与维护就变得尤为重要。     

线程级并行计算在图形渲染引擎中的研究

针对并行计算技术在当前图形渲染系统中应用层面较浅的问题,为提高多核平台下图形应用程序CPU利用率,提出了一种新的Fork-Join多线程渲染方案。对当前流行的开源图形渲染引擎——OGRE引擎的渲染框架进行了多线程优化,用OpenMP方法对图形引擎的逻辑帧实现并行化,根据Win32线程库和DirectX11的多线程支持提出了一种渲染帧并行化方法,并将其应用于图形引擎。在多核平台上的实验结果表明,该方案能有效提高渲染速率和CPU利用率,改善CPU负载均衡。     

Accelerating geoscience and engineering system simulations on graphics hardware

Many complex natural systems studied in the geosciences are characterized by simple local-scale interactions that result in complex emergent behavior. Simulations of these systems, often implemented in parallel using standard central processing unit (CPU) clusters, may be better suited to parallel processing environments with large numbers of simple processors. Such an environment is found in graphics processing units (GPUs) on graphics cards.This paper discusses GPU implementations of three example applications from computational fluid dynamics, seismic wave propagation, and rock magnetism. These candidate applications involve important numerical modeling techniques, widely employed in physical system simulations, that are themselves examples of distinct computing classes identified as fundamental to scientific and engineering computing. The presented numerical methods (and respective computing classes they belong to) are: (1) a lattice-Boltzmann code for geofluid dynamics (structured grid class); (2) a spectral-finite-element code for seismic wave propagation simulations (sparse linear algebra class); and (3) a least-squares minimization code for interpreting magnetic force microscopy data (dense linear algebra class). Significant performance increases (between 10× and 30× in most cases) are seen in all three applications, demonstrating the power of GPU implementations for these types of simulations and, more generally, their associated computing classes.     

Fast Isosurface Rendering on a GPU by Cell Rasterization

This paper presents a fast, high‐quality, GPU‐based isosurface rendering pipeline for implicit surfaces defined by a regular volumetric grid. GPUs are designed primarily for use with polygonal primitives, rather than volume primitives, but here we directly treat each volume cell as a single rendering primitive by designing a vertex program and fragment program on a commodity GPU. Compared with previous raycasting methods, ours has a more effective memory footprint (cache locality) and better coherence between multiple parallel SIMD processors. Furthermore, we extend and speed up our approach by introducing a new view‐dependent sorting algorithm to take advantage of the early‐z‐culling feature of the GPU to gain significant performance speed‐up. As another advantage, this sorting algorithm makes multiple transparent isosurfaces rendering available almost for free. Finally, we demonstrate the effectiveness and quality of our techniques in several real‐time rendering scenarios and include analysis and comparisons with previous work.     

基于SOPC及图形加速引擎的座舱显示系统

提出一种基于可编程片上系统和图形加速引擎的飞机座舱综合显示系统设计方案。为避免图形加速引擎直接对帧存储器进行零碎操作导致的存储器操作瓶颈,引入图形缓存机制。根据图形像素的存储特点提出“远区域优先”图形缓存页面淘汰算法。对汉字及自定义位图等操作采取软硬件结合的方式达到系统性能和资源利用的平衡,利用硬件锁保证帧存储器一致性。通过对模块进行波形仿真实现系统级仿真结果的可视化验证。     

基于SiPESC平台的卫星编队飞行视景仿真系统设计和实现

针对卫星编队飞行视景仿真的需求,基于SiPESC平台设计并实现视景仿真系统SiPESC.SatFly.在架构设计层,基于SiPESC平台,采用插件式体系结构,将功能需求易于变化的部分设计为独立插件;在系统实现层,结合OGRE(Object-Oriented Graphics Rendering Engine)渲染引擎和XML,实现预设方案的灵活配置;在仿真应用层,实现近地轨道卫星编队飞行和卫星轨道转移过程仿真.该系统通用性强,配置灵活,场景渲染逼真,并且提供多窗口、多视角的观察模式,方便数据分析和概念理解.     

基于H.264的视频编码标准的关键技术分析

H.261是ITU-T于1990年制定的一个视频编码标准,设计目的是能够在带宽为64kbps的倍数的综合业务数字网上传输质量可接受的视频信号,是最早的运动图像压缩标准,本文对H.261的视频编码标准关键技术研究。     

As‐Killing‐As‐Possible Vector Fields for Planar Deformation

Cartoon animation, image warping, and several other tasks in two‐dimensional computer graphics reduce to the formulation of a reasonable model for planar deformation. A deformation is a map from a given shape to a new one, and its quality is determined by the type of distortion it introduces. In many applications, a desirable map is as isometric as possible. Finding such deformations, however, is a nonlinear problem, and most of the existing solutions approach it by minimizing a nonlinear energy. Such methods are not guaranteed to converge to a global optimum and often suffer from robustness issues. We propose a new approach based on approximate Killing vector fields (AKVFs), first introduced in shape processing. AKVFs generate near‐isometric deformations, which can be motivated as direction fields minimizing an “as‐rigid‐as‐possible” (ARAP) energy to first order. We first solve for an AKVF on the domain given user constraints via a linear optimization problem and then use this AKVF as the initial velocity field of the deformation. In this way, we transfer the inherent nonlinearity of the deformation problem to finding trajectories for each point of the domain having the given initial velocities. We show that a specific class of trajectories — the set of logarithmic spirals — is especially suited for this task both in practice and through its relationship to linear holomorphic vector fields. We demonstrate the effectiveness of our method for planar deformation by comparing it with existing state‐of‐the‐art deformation methods.