Computer and Web Graphics
Computer graphics (CG) is the field of visual computing, where one utilizes computers both to generate visual images synthetically and to integrate or alter visual and spatial information sampled from the real world. The first major advance in computer graphics was the development of Sketchpad in 1962 by Ivan Sutherland.
It is often thought that the first feature film to use computer graphics was 2001: A Space Odyssey (1968), which attempted to show how computers would be much more graphical in the future. However, all the "computer graphic" effects in that film were hand-drawn animation, and the special effects sequences were produced entirely with conventional optical and model effects.
Perhaps the first use of computer graphics specifically to illustrate computer graphics was in Futureworld (1976), which included an animation of a human face and hand--produced by Ed Catmull and Fred Parke at the University of Utah.
The first advance in computer graphics was in the use of CRTs. There are two approaches to 2D computer graphics: vector and raster graphics. Vector graphics stores precise geometric data, topology and style such as: coordinate positions of points, the connections between points (to form lines or paths), and the color, thickness, and possible fill of the shapes. Most vector graphic systems can also use primitives of standard shapes such as circles, rectangles, etc. In most cases, a vector graphic image has to be converted to a raster image to be viewed. Raster graphics is a uniform 2-dimensional grid of pixels. Each pixel has a specific value such as, for instance, brightness, color, transparency, or a combination of such values. A raster image has a finite resolution of a specific number of rows and columns. Standard computer displays shows a raster image of resolutions such as 1280(columns)x1024(rows) of pixels. Today, one often combines raster and vector graphics in compound file formats (pdf, swf).
With the birth of workstation computers (like LISP machines, paintbox computers and Silicon Graphics workstations) came 3D computer graphics, based on vector graphics. Instead of the computer storing information about points, lines, and curves on a 2-dimensional plane, the computer stores the location of points, lines, and, typically, faces (to construct a polygon) in 3-dimensional space. 3-dimensional polygons are the lifeblood of virtually all 3D computer graphics. As a result, most 3D graphics engines are based around storing points (single 3-dimensional coordinates), lines that connect those points together, faces defined by the lines, and then a sequence of faces to create 3D polygons. Modern-day computer graphics software goes far beyond just the simple storage of polygons in computer memory. Today's graphics are not only the product of massive collections of polygons into recognizable shapes, but they also result from techniques in shading, texturing, and rasterization.
Computer graphics is all about obtaining 2D images from 3D models. In order to get highly accurate and photo-realistic images, the input 3D models should be very accurate in terms of geometry and colors. Simulating the real 3D world scene using Computer Graphics is difficult, because obtaining accurate 3D geometry of the world is difficult. Instead of obtaining 3D models, image-based rendering (IBR) uses the images taken from particular view points and tries to obtain new images from other view points. Though the term "image-based rendering" was coined recently, it has been in practice since the inception of research in computer vision. In 1996, two image-based rendering techniques were presented in SIGGRAPH: light field rendering and Lumigraph rendering. These techniques received special attention in the research community. Since then, many representations for IBR were proposed. One popular method is view-dependent texture mapping, an IBR technique from University of Southern California. Andrew Zisserman, et. al from Oxford University used machine learning concepts for IBR.
Flat shading: A technique that shades each polygon of an object based on the polygon's "normal" and the position and intensity of a light source.
Gouraud shading: Invented by Henri Gouraud in 1971, a fast and resource-conscious technique used to simulate smoothly shaded surfaces by interpolating vertex colors across a polygon's surface.
Texture mapping: A technique for simulating surface detail by mapping images (textures) onto polygons.
Phong shading: Invented by Bui Tuong Phong, a smooth shading technique that approximates curved-surface lighting by interpolating the vertex normals of a polygon across the surface; the lighting model includes glossy reflection with a controllable level of gloss.
Bump mapping: Invented by Jim Blinn, a normal-perturbation technique used to simulate bumpy or wrinkled surfaces.
Normal mapping: Related to bump mapping, a more in-depth way of simulating bumps, wrinkles, or other intricate details into low-polygon models.
Ray tracing: A method based on the physical principles of geometric optics that can simulate multiple reflections and transparency.
Radiosity: a technique for global illumination that uses radiative transfer theory to simulate indirect (reflected) illumination in scenes with diffuse surfaces.
Blobs: a technique for representing surfaces without specifying a hard boundary representation, usually implemented as a procedural surface like a Van der Waals equipotential (in chemistry).
Links to Computer Graphics
These links have been provided for informational purposes only. We have not evaluated them. Hinduwebsite.com does not have any relationship with them. Some of the links may be outdated as they have not been recently updated.
Suggestions for Further Reading
- Common Gateway Interface - CGI
- CRM, Customer Relationship Management
- Data Warehouse and Data Mining Technologies
- Relational Databases
- DHTML Scripts - Resources For Dynamic Websites
- Domain Name Registration Services
- Ecommerce and Online Store Solutions
- Online Marketing Solutions and Promotions
- Essays on Information Technology
- Free Software, Tools and Applications
- Computer and Web Graphics
- HyperText Markup Language
- Html Tools for World Wide Web
- Java Programming language, Tutorials, Tools and Applets
- Computer Networks
- Computer Operating Systems
- OS X Mountain Lion and Parallels Desktop For Mac
- Perl Scripts - Resources for CGI and Perl Programming
- Programming Languages
- Project Management
- Search Engines and SEO
- Web design and Website development
- Best Web Hosting Services
- Web Resources and Web Tools
- Web Tools And Web Resources For The Web Masters
- Essays On Dharma
- Esoteric Mystic Hinduism
- Introduction to Hinduism
- Hindu Way of Life
- Essays On Karma
- Hindu Rites and Rituals
- The Origin of The Sanskrit Language
- Symbolism in Hinduism
- Essays on The Upanishads
- Concepts of Hinduism
- Essays on Atman
- Hindu Festivals
- Spiritual Practice
- Right Living
- Yoga of Sorrow
- Mental Health
- Concepts of Buddhism
- General Essays
Attribution: Information for this article has been adapted from wikipedia under GNLU licence.
Disclaimer: The external links provided herein are third-party links. We do not have any control over them and we cannot guarantee their accuracy or their authenticity. The links are being provided as a convenience and for informational purposes only; they do not constitute an endorsement or an approval by Hinduwebsite.com of any of the products, services or opinions of the corporation or organization or individual. Hinduwebsite.com bears no responsibility for the accuracy, legality or content of the external site or for that of subsequent links. Any transactions that you enter into with a vendor, merchant or other party listed in this site or linked from this site are solely between you and that vendor, merchant or other party. Contact the external site for answers to questions regarding its content.
Translate the Page