DirectJ: Java APIs for optimized 2D graphics

The ever more widespread diffusion of Java interfaces and animations has highlighted the performance problems of the Java graphics environment. We have analysed the bottleneck and created a set of APIs that support direct access to platform specific hardware resources for graphics acceleration. We have also re‐implemented standard APIs in order to allow transparent direct access also by programs using standard JFC. The improvement in performance of about one order of magnitude encourages the utilization of Java for realizing fluid animations on large windows. Copyright © 2001 John Wiley & Sons, Ltd.     

The Panda3D graphics engine

Disney's VR Studio developed Panda3D, a graphics engine and programming environment, to be flexible enough to support everything from real-time graphics applications to the development of high-end virtual reality theme park attractions or video games. The acronym itself lists Panda's primary features as platform-agnostic, networked, display architecture. As a result of its powerful and flexible design, much of the Panda system's architecture reflects the occasionally opposing goals of performance and versatility.     

3D graphics processor chip set

Increasingly, 3D graphics is becoming the rule rather than the exception in applications such as games, CAD/CAM, and video production. Some LSIs provide rendering capabilities, but require an additional CPU to perform essential geometry transformations. Fujitsu's chip set solves that problem using two processors to render 300,000 polygons per second (for flat-shaded triangles with texture)-performance comparable to that of advanced game machines     

三维图形系统中的物体裁剪问题

三维图形系统是三维游戏引擎中的子引擎部分,负责处理三维世界的数据结构以及从玩家或相机所在的视点渲染三维世界。其中的一个重要问题就是物体剪裁问题。对物体裁剪的工作原理进行了详细的分析,提出了一个新的简便的裁剪算法,并给出了该算法的关键代码。     

A processor architecture for 3D graphics

The DLX/3DCP architecture that uses a method of parallel processing on 3-D vectors to overcome the problem of the large number of floating-point operations required in 3-D graphics which limits the performance of graphics systems is described. The architecture's design offers general-purpose programmability from the high-level object-oriented language C++ and generates performance expected only from dedicated special-purpose hardware. Results that show the architecture's performance on graphics operations are presented and compared to the performance of other RISC processors     

Net results [3D graphics]

A good 3D visual imagination is valuable for anyone working in 3D graphics. An excellent way to develop that imagination is to build models and hold them, turn them, and study them. The author begins with Platonic solids. He shows an unfolded shape, such as a tetrahedron made of four equilateral triangles, and includes small assembly flaps. He shows the unfolded diagrams or nets for these solids. He discusses the kaleidocycle, one of the most interesting dynamic polyhedral models     

A Survey of Perceptually Motivated 3D Visualization of Medical Image Data

This survey provides an overview of perceptually motivated techniques for the visualization of medical image data, including physics‐based lighting techniques as well as illustrative rendering that incorporate spatial depth and shape cues. Additionally, we discuss evaluations that were conducted in order to study the perceptual effects of these visualization techniques as compared to conventional techniques. These evaluations assessed depth and shape perception with depth judgment, orientation matching, and related tasks. This overview of existing techniques and their evaluation serves as a basis for defining the evaluation process of medical visualizations and to discuss a research agenda.     

Evaluating graphics displays for complex 3D models

This article summarizes a user study of viewing 3D geometry on large-screen display devices. The geometry models the structure of a complex physical object. Our results show that the crispness of a display device (intraframe performance) must be considered along with the speed at which new frames can be computed (interframe performance). It's important to consider crispness from the user's perspective, using values that aren't often published in device specifications. Equally important is the framework for different types of 3D data and the categorization of display technology and techniques     

Exploring 3D computer graphics in cockpit avionics

A system that uses 3-D computer graphics to integrate and visualize flight information and to encode navigational information of the objects of a 3-D scene is described. The computer-generated views of geographic features, weather information, and air traffic used in the system are discussed. The system's support of instrument approach technology is also discussed. A number of design notions that have come out of this work, are reviewed     

基于图形语义理解的三维重建技术

分析了目前三维重建的方法所面临的困难和存在的问题,介绍了基于图形语义理解的三维重建技术的方法和过程,指出利用基于图形语义理解的三维重建方法的可行性与必要性,指出利用语义理解在解决三维重建面临的困难时所发挥的作用.最后,介绍了利用相图语义的理解对金属相图进行三维重建的过程和方法.     

基于平面几何图形的立体浮雕建模技术

针对具有复杂曲面的艺术类浮雕建模问题,提出一种基于平面几何图形的解决方案。首先由二维区域和截面形状定义出浮雕曲面,浮雕则采用Z-MAP栅格在计算机内离散表示;然后把多个浮雕曲面通过六种可选方式融合成具有复杂外形的立体浮雕。为提高建模效率,给出一种针对二维区域内Z-MAP栅格点的快速遍历算法。最后通过多个应用实例,验证了上述技术方案。     

An adaptive framework for 3D graphics over networks

Access to and transmission of 3D models over networks becomes increasingly popular. However, the performance and quality of access to remote 3D models strongly depends on system load conditions and the capabilities of the various system components, such as clients, servers, and interconnect. The network graphics framework (NGF) integrates various transmission methods for downloading 3D models in a client–server environment. The NGF automatically selects the optimal transmission method for a given pair of client and server, taking into account characteristics of the model to be transmitted, critical environment conditions, user preferences and the capabilities of the client and the server. The NGF aims to provide constant quality of service across different clients and under varying environment conditions.     

浅析三维图形中的信息隐藏技术

目前对三维图形作品的知识产权的保护与重要信息加密隐藏的需求日益增长,人们开始使用隐藏技术为三维数字化作品添加数字水印或通过三维图形信息隐藏技术加密重要信息.文章对三维图形中的信息隐藏技术作了剖析,并对基于距不变特征的隐藏算法进行了研究,最后利用ply格式的三角形网格Cow三维模型对算法进行了验证.     

Low-cost hardware platform for developing realtime 3D graphics

BRAD3D, a low-cost hardware platform for the development of a realtime 3D graphics software is presented. The BRAD3D configuration is derived from a generalization of 3D image synthesis. Three basic processes have been identified: the geometric process, dealing with the measurements of the scene; the topologic process, extracting visible information from the polygonal structure; and the scan-conversion process, producing pixel values on a frame buffer. BRAD3D is implemented as a three-stage pipeline and accommodates depth-list and scan-line hidden-surface-removal algorithms. Each stage of the pipeline can be implemented using different hardware solutions. A microprocessor-based solution is presented as a general prototyping approach.     

图形语义理解的三维重建技术在相图中的应用

分析了目前进行金属相图的三维重建时面临的困难和存在的问题,介绍了基于图形语义理解的三维重建技术在相图领域中的应用方法,指出方法的可行性和必要性。最后,指明了目前研究的不足之处,以及下一步研究的方向和重点。     

基于OpenGL的数控仿真三维图形的研究

数控加工过程由数控程序控制,但数控程序的错误往往不容易被发现。从而在实际加工中可能出现碰撞干涉等问题。通过数控仿真软件可以在制造之前在计算机中模拟加工过程,发现可能出现的碰撞、干涉,零件的可加工性及工艺的合理性等。而在虚拟加工环境下,三维图形处理是其核心的技术问题。本文以三维图形软件标准OpenGL为工具,探讨数控仿真系统中三维图形的处理方法。