Computer Graphics : Intro

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Computer Graphics: Overview

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What is computer graphics? ● Representation and display of image data ● Concerned with mathematical and computational aspects of displaying and representing images ● Not concerned with design/aesthetics

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3D Modelling ● Mathematical representation of 3D surface ● Polygonal modelling: Mesh ● Curve modelling: NURBS

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Wireframe model

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NURBS surface

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3D Rendering ● Displaying a model (or collection of models) ● Real-time/Non real-time

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The Graphics Pipeline ● Vertex transformation: Translation, rotation, scaling, projection ● Clipping and rasterization, hidden surface detection ● Per-pixel operations: Lighting, texture mapping ● Display finished frame

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Transformation matrices

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Illumination

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Texture mapping

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The Role of the Graphics card ● GPU and RAM ● Used for hardware accelerated graphics computations

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The Graphics Processing Unit ● Implements the graphics pipeline in hardware ● Performs vector and matrix operations, clipping, interpolation, rasterization and more ● Can simultaneously perform many computations

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Video Memory

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The Graphics Pipeline

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APIs: OpenGL and Direct3D ● Used to command the graphics card ● Configure graphics pipeline, copy data to video memory, load and run shaders ● Low-level

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Thank you \(^o^)/