What is Computer Graphics?
Computer graphics is the field of study concerned with generating, manipulating, and rendering visual content using computers. It encompasses everything from simple 2D diagrams to photorealistic 3D scenes, interactive video games, scientific visualizations, and computer-aided design.
At its core, computer graphics converts mathematical representations of objects and scenes into images that can be displayed on screens, printed on paper, or stored as files.
Applications
- Entertainment: Movies, video games, virtual reality
- Design: CAD/CAM, architecture, industrial design
- Science: Visualization of data, medical imaging, simulation
- Communication: Infographics, user interfaces, digital art
- Simulation: Flight simulators, training, robotics
Key Concepts
Computer graphics involves several fundamental concepts that form the basis of all visual computing: geometry (representing shapes), color (representing appearance), lighting (simulating how light interacts with surfaces), and rasterization (converting mathematical descriptions to pixels).
History
The field dates back to the 1960s with pioneers like Ivan Sutherland, who created Sketchpad, one of the first interactive graphics programs. The development of GPU hardware in the 1990s and 2000s revolutionized real-time rendering, enabling the modern gaming and visualization industries.
The Rendering Equation
L_o = L_e + โซ f_r L_i cos(ฮธ) dฯ
Where:
L_o = Outgoing radiance
L_e = Emitted radiance
f_r = BRDF (reflectance)
L_i = Incident radiance
ฮธ = Angle between normal and incoming light
dฯ = Differential solid angle