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Class1[1] - CS580(Computer Graphics Rendering Ulrich...

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CS580 (Computer Graphics Rendering) Ulrich Neumann
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Course Overview Basics of rendering Advanced topics Applications Term Project 2-4/team HW 1 HW 2 HW 3 HW 4 HW 5 HW 6
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What Will be Covered? Image package Photoshop CAD package Graphics Design Applications Computer Graphics Auto CAD Modeling package 3D Studio Max Animation package Flash, Digimation 3D Graphics Video Virtual Reality Animation Visualization Movie Effects Games Algorithms Research Web Design
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Introduction to Computer Graphics (CG) Graphics process Applications
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Introduction to CG Define Computer Graphics… The technology associated with the use of computer technology to convert created or collected data into visual representations Model Rendering focus of course Display
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Graphics Process Rendering Xform, Light, Shade, & Rasterize Surface Model Image Display Geometric Model Scene Model
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Geometry Modeling There are many ways to describe geometry Explicit geometry : Triangle meshes, Patches, Subdivision surfaces,… Implicit geometry : Surface defined by x 2 + y 2 + z 2 = 10 Fractal sets, procedural definition, … Volume data Samples from MRI, ultra-sound, simulation…
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Example of Triangle Meshes
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Making Models Rendering 3D scanner Computer vision Model libraries Interaction Geometric Modeling Points, Lines, Surfaces, …
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Making Surface Models Rendering Scanner Paint Image libraries Camera Surface Parameters Color, BRDF, Opacity, …
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Rendering Rendering Transformation Image generation IG = (lighting, shading, scan conversion) Surface Model Geometric Model + = Image Display
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Image Display Rendering Image Representation Pixel array, Stroke list, NC cut list, Optical Modulation CRT, LCD, Plasma, Ink, Solid material
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Digital Images: pixels
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Frame Buffer Frame Buffer A block of memory, dedicated that contains the pixel array to be passed to the optical display system Each pixel encodes color or other properties (e.g., opacity)
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Frame Buffer Concepts Pixel: One element of frame buffer - uniquely accessible point in image Resolution: Width x Height (in pixels) - 640x480, 1280x1024, 1920x1080 Color depth: Number of bits per-pixel in the buffer - 8, 16, 24, 32-bits for RGBA Buffer size: Total memory allocated for buffer
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Frame Buffer Opacity Alpha Used for compositing or merging images Alpha channel added to color Holds the alpha value for every pixel 8 bit range: 0 (transparent) 255 (opaque)
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How Much Memory? For example: If width=640, height=480, color depth=24 bits Buffer size = 640 * 480 * 3 = 921,600 bytes If width=1920, height=1080, color depth=24 bits Buffer size = 1920 * 1080 * 3 = 6,220,800 bytes Buffer size = width * height *color depth
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Display Device CRT (Cathode Ray Tube) LCD (Liquid Crystal Displays) Plasma, Projection, HMD, Volumetric, … Important Features: size, resolution, field of view, pixel- pitch, color range, brightness, refresh-rate, black level, update mode (e.g., interlacing, …), distortion
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Interaction
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