专业英语

graphics on the web
Web browsers were originally designed to support a limited number of graphics formats-GIF and JPEG-and these formats were exclusively bitmaps.
vector & 3-D graphics
Like vector graphics , 3-D graphics are stored as a set of instructions. For a 3D graphic , however, the instructions contain the locations and lengths of lines that from a wireframe(线框) for a 3-D object.
3-D graphics Animation
3-D graphics can be animated to produce special effects for movies or to create interactive, animated characters and environments for 3-D computer games .
A vector graphic can be converted quite easily into a bitmap graphic through a process called rasterizing(将图像光栅化). Rasterization works by superimposing(叠加) a grid over a vector image and determining the color for each pixel.
The handled information
Computer game designers believe that on-screen animation looks smoothest at 60 frames per second, which means your computer must handle 1,509,949,440-that’s more than 1 billion-bits of information every second just to put the 3-D image onto the screen.
movie animation
An important characteristic of special effects and animated films is that rendering can be accomplished during the production phase of the movie and incorporated into the final footage（纳 入最终胶片）.
Chapter 7 Digital Media
Section B Vector and 3-D Graphics
Vector and bitmap conversion 3-D graphics Animation of 3-D graphics
Vector-to-bitmap conversion
graphiቤተ መጻሕፍቲ ባይዱs on the web
A graphics format called SVG (Scalable Vector Graphics )（可扩展的矢量图形） is designed specifically for the Web. Graphics in SVG graphic objects can include regular and irregular shapes, images and text, and they can be animated.
Creation of 3-D graphics
To create 3-D graphics , you need 3-D graphics software , such as AutoCad or Caligari trueSpace. This software has tools for drawing a wireframe and viewing it from any angle.
game animation
In contrast 3-D computer game animation happens in “real time.” Each frame that makes the image seem to move must be rendered while you are playing the game--a process that requires an incredible amount of computer power .
bitmap-to-Vector conversion
To change a bitmap graphic into a vector graphic, you must use special tracing software. Tracing software locates the edges of objects in a bitmap image and converts the resulting shapes into vector graphic objects.