Computer Graphics - Kent State Universityruttan/graphics/lectures/lecture1c.pdf · Angel and...

Angel and Shreiner: Interactive Computer Graphics 7E © Addison-Wesley 2015

Computer Graphics

Computer graphics deals with all aspects of creating images with a computerHardwareSoftwareApplications

Example

Where did this image come from?

What hardware/software did we need to produce it?

Preliminary Answer

Application: The object is an artist’s rendition of the sun for an animation to be shown in a domed environment (planetarium)Software: Maya for modeling and

rendering but Maya is built on top of OpenGLHardware: PC with graphics card for

modeling and rendering

Basic Graphics System

Input devices

Output device

Image formed in FB

Computer Graphics:1950-1960

Computer graphics goes back to the earliest days of computingStrip chartsPen plottersSimple displays using A/D converters to go from

computer to calligraphic CRT

Cost of refresh for CRT too high Computers slow, expensive, unreliable

Pen Plotter

Wireframe graphicsDraw only lines

Display Processors

wireframe representationof sun object

Can be used to display contents of frame buffer (raster mode)

Raster GraphicsImage produced as an array (the raster) of picture

elements (pixels) in the frame buffer

Raster GraphicsImage produced as an array (the raster) of picture

elements (pixels) in the frame buffer

Raster Graphics

Allows us to go from lines and wire frame images to filled polygons

Realism comes to computer graphics

smooth shading environment mapping

bump mapping

Special purpose hardwareSilicon Graphics geometry engine

VLSI implementation of graphics pipeline

Networked graphics: X Window SystemHuman-Computer Interface (HCI)

OpenGL APICompletely computer-generated feature-length

movies (Toy Story) are successfulNew hardware capabilities

Texture mappingBlendingAccumulation, stencil buffers

Computer Graphics: 2000-

PhotorealismGraphics cards for PCs dominate market

Nvidia, ATI, Intel.

Game boxes and game players determine direction of market

Computer graphics routine in movie industry: Maya, 3DS Max.

Programmable pipelines

Computer Graphics - Kent State Universityruttan/graphics/lectures/lecture1c.pdf · Angel and...

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