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Introduction to 3D Graphics

Introduction to 3D Graphics. Computer Graphics. Animation. Rendering. …. Vector Graphics. Raster Graphics. Solid Modeling. Scientific Visualization. Rendering. Computer graphics is “the creation and manipulation of graphics images by means of computer.” (Marc Berger, 1986.). 681-782.

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Introduction to 3D Graphics

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  1. Introduction to 3D Graphics CSE 681

  2. Computer Graphics Animation Rendering … Vector Graphics Raster Graphics Solid Modeling Scientific Visualization Rendering Computer graphics is “the creation and manipulation of graphics images by means of computer.” (Marc Berger, 1986.) 681-782 Real-time 694A,682? 781 784 Coming soon… CSE 681

  3. Vector Graphics Draw a picture line by line. • Advantages: • Straight lines. • Hardward supports high resolution • Drawbacks: • Not solid imagery (wireframe). • Vector hardware continually redraws all objects. CSE 681

  4. Raster Graphics n x m grid of pixels • Advantages: • Based on TV technology • Lends itself to shaded imagery • Problems: • Needs a frame buffer • Convert objects to pixels • Aliasing: Screen resolution may be much less than object resolution. CSE 681

  5. 2D v. 3D y Window x Viewport SCREEN CSE 681

  6. 3D Graphics 3D Graphics Modeling Rendering Animating Vector Graphics Raster Graphics Scan Conversion Ray Tracing CSE 681

  7. Image plane Scan Conversion • Transform 3d object into 2d object (object-based) • “Scan” 3d object, converting it into pixels. • Fast; • Commonly used; • Industry standard – OpenGL; • Hardware support (OpenGL). CSE 681

  8. Ray Tracing • Shoot a ray through each pixel (pixel-based) • Find first object intersected by ray. Image plane Eye • Slow; • Not commonly used; • No hardware support. CSE 681

  9. Scan Conversion v. Ray Tracing • Ray Tracing • (CSE 681) • Models optics (better); • Photorealistic rendering; • Special effects; • Better for understanding rendering/lighting. Scan Conversion (CSE 581, 781, …) • Fast; • Commonly used; • Industry standard (OpenGL); • Hardware support. CSE 681

  10. Creating a Scene • Translate & rotate objects. • Linear algebra. (Prerequisite: Math 568 or 571.) CSE 681

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