Plan für heute. Vorlesungstermine. CG1 & CG2 Vorlesungsthemen. Anwendungsgebiete. Warum Computer Grafik? Computergrafik 1&2 SS 2010

Transkript

1 Plan für heute Computergrafik 1&2 SS Organisation der Vorlesung Anwendungen der Computergrafik Konzepte der Computergrafik Display Technologies Prof. Institut für maschinelles Sehen und Darstellen 1 2 Readings: CG1 & CG2 Vorlesungsthemen Hearn & Baker Computer Graphics with OpenGL Chapter 1 Some slides adapted from University College London Vorlesungstermine CG Einführung + Displays Ray casting + 2D Rendering D Rendering Rasterization D Object Representations 7.4. Surface Rendering CG Visible Surface Detection + Color Models Computer Animation OpenGL Prüfung CG Global Illumination Visualization Prüfung CG Warum Computer Grafik? Bilder dienen zur Kommunikation Verständnis, Einsicht Unterhaltung Effiziente Generierung von Bildern Challenges Echtzeit Grosse Datenmengen Realismus Verständliche Visualisierung Nicht reale Welten Anwendungsgebiete Graphical User Interfaces Graphs and Charts Computer-Aided Design Data Visualizations Education and Training Virtual Reality Entertainment 5 6 1

2 Graphical User Interfaces Graphs and Charts 7 Graphical User Interface Library: Presentation Graphics Examples 8 Computer-Aided Design 9 10 CAD Examples realistic rendering CAD Examples NC drilling machine simulation Architecture

3 Data Visualizations Visualization of Molecules Scientific data Medical data 3D scanners Reconstructions GIS & Mapping Protein structure Visualization: Flow fields Medical Visualization 15 Virtual Reality Liver Surgery Planning 16 Visualisierung verborgener Information

4 g Education & Training Prunksaal der Nationalbibliothek operating a virtual tractor Bildbasierte Rekonstruktion texturiertes Modell interaktiv begehbar headset view Education and Training Examples Education and Training Examples space shuttle simulation Military simulators

5 Education and Training Examples Entertainment automobile simulator to test driver reaction Computer Painting Examples a Van Gogh look-alike Movies an electronic watercolor Pixar: Monster s Inc. Square: Final Fantasy 27 Cartoon Animation: Historic Work 1. Assignment See Avatar!

6 Pixar: Luxo Jr Video Effekte: Morphing Meilenstein der 3D-Animation als Filmkunst Michael Jackson Video Black or White Kommerzieller Durchbruch des Morphing (2D)Computergrafik Einführung Computer games Computer games Blizzard: World of Warcraft The Invisible Train Concepts of Computer Graphics Creating an Illusion Modeling the environment Rendering Light Augmented Reality auf PDA/smartphone

7 Creating an Illusion Creating an Illusion Observe real environment Eye acts as camera Replace with an image Eye acts as camera Creating an Illusion Creating an Illusion Eye acts as camera Eye acts as camera Replace with an image Replace with a digital image Requires models of Environment A description of a space consisting of objects Objects have description and state Description consists of behaviour, geometry and appearance Geometry must be described relative to a co-ordinate frame State defines the object at a particular moment in time The environment The imaging process = rendering The camera

8 Painting Through a Window Major Concepts of Graphics Separation of Scene Specification, Viewing and Rendering Scene is modelled independent of any view Views are unconstrained There are many possible rendering methods given a scene and a view COP View Window (showing pixels) COP = Centre of Projection View volume Major Concepts of Graphics The extent of the pixels on the screen and the COP define a pyramid Clipping is the process of removing anything from the scene that is not in the view volume Major Concepts of Graphics Rasterization Sampling scene geometry ~ camera sampling light Aliasing Pixels are square and only sample the actual light Major Concepts of Graphics Lighting Ray-casting is the simple part Determining the color of the pixel is hard Color Perception vs. physics Lighting is a Global Problem That is, if you consider any point in the environment, it receives light from all around

9 Surfaces are Rarely Mirrors Specular surface θ θ Diffuse Surface 49 9