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The Cohen-Sutherland Line-Clipping Algorithm. First bit: above top edge y ymax ... Polygon Clipping. Sutherland-Hodgeman algorithm (A divide-and-conquer strategy) ...
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Top-Left. Bottom-Left. TBRL. 9/26/09. SCG 3023. 7. Cohen-Sutherland line clipping. 0000. 0100 ... BOTTOM .. if bit 3 = 1 .. .. .. RIGHT .. If bit 4 = 1 .. .. .. LEFT. ...
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Polygons that are completely inside the view volume are processed for display. ... Recall that we need polygon clipping against the view volume. ...
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Given a point (x, y) and clipping window (xmin, ymin), (xmax, ... Big Optimization: trivial ... of u for which x and y both inside the viewing window. 72 /128 ...
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Viewing & Clipping In 2D Contents Windowing Concepts Clipping Introduction Brute Force Cohen-Sutherland Clipping Algorithm Area Clipping Sutherland-Hodgman Area ...
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2D Viewing Contents 3D Rendering Pipeline 2D Rendering Pipeline Clipping Cohen-Sutherland Line Clipping Sutherland ...
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Computer Graphics 4: Viewing In 2D Contents Windowing Concepts Clipping Introduction Brute Force Cohen-Sutherland Clipping Algorithm Area Clipping Sutherland-Hodgman ...
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Larry F. Hodges, G. Drew Kessler. 1. 3-D Clipping. Larry F. Hodges, G. Drew Kessler ... 3-D Extension of 2-D Cohen-Sutherland Algorithm, Outcode of six bits. ...
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Just as with scan-conversion algorithms, clipping algorithms are called whenever ... easy for thick and filled primitives as part of scan line fill ...
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Clipping. analytically calculating the portions of ... Clipping Lines To Viewport. combining trivial accepts/rejects ... Cohen-Sutherland Line Clipping ...
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... to be inside a rectangle t, b, r, l , it should be guaranteed that l x r and b y t. ... The edge crosses top and left. t b r l. Cohen-Sutherland clipping ...
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External vertices are eliminated. 1 2 3 4 5 1 2 3 4 5 Polygon Clipping: The Convexity Problem Single object becomes multiple objects.
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Form new line segment AB and discard BD because above the window. ... Student Exercise. Draw three possible results of interior clipping of the string 'ABC' ...
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Clipping. Aaron Bloomfield. CS 445: Introduction to Graphics. Fall 2006 ... Clipping. Analytically calculating the portions of primitives within the viewport. 12 ...
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Object space: coordinate where each component is defined ... Clipping space: All point is in homogeneous coordinate. ... homogeneous coordinate is translated ...
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3.2.5 Clipping, zooming and roaming. p. 91: smooth animations and double buffering ... 3.3.2 Cohen-Sutherland clipping. Checks for trivial accept or trivial reject ...
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Intersection calculation ... for x, get t, calculate corresponding y. ... The calculation of an outcode for each endpoint allows for an efficient implementation. ...
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scissoring, a brute force technique ... Use scissoring. Clip each filled scan line. CS 4451 David Krum Georgia Tech. 26. Clipping Ellipses ...
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I N T R O D U C T I O N T O C O M P U T E R G R A P H I C S ... Brute force clip: solve simultaneous equations using y = mx b for line and four clip edges ...
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A fundamental task in graphics is to keep those parts of an object that lie ... We chop each end-point of the line at the 'nearest' window boundary. 1. 2. 3. 4 ...
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clipping (taglio ai bordi) e facce nascoste clipping e facce nascoste visualizzazione da 3D a 2D e poi su schermo: eliminazione delle parti che escono dalla scena o ...
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Visibility culling Clipping. The visibility problem. What polygons are visible? ... Outside the volume (view frustum culling) Facing away (back-face culling) ...
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... Transformation - The process of going from a window in world coordinates to ... If a pixel is square, we can map NDC to the largest square region of the screen. ...
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If they are both in region 0000, then it's completely in. ... numbers both have a 1 in the same bit position, the line is completely out. ...
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World Coordinate System (Object Space) - Representation of an object measured in ... Screen Coordinate System (Image Space) - The space within the image is displayed ...
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CS 4731: Computer Graphics Lecture 14: 3D Clipping and Viewport Transformation Emmanuel Agu
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CS 445 / 645: Introductory Computer Graphics Clipping Lines and Polygons Review: Polygon Rasterization Review: Active Edge Table Two data structures Edge Table Array ...
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Computer Graphics using OpenGL, 3rd Edition F. S. Hill, Jr. and S. Kelley Chapter 3 Additional Drawing Tools PART II Clipping Lines We want to draw only the parts of ...
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different video. monitors with. Workstation. transformation. 2001. 7. ... Particles (explosion, sea foam) 2001. 7. 13. 17. Line Clipping (1/3) a) Before Clipping ...
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Ray Casting, Ray Tracing. Week 7, Lecture 14. David Breen, William ... Snell's Law: i sin i = t sin. t Let = i / t =sin t / sin. i Let m = (cos i n - i) / sin ...
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Edge data can be explicitly or implicitly represented in a data structure ... Cyrus-Beck (1978) Somewhat different from Cohen-Sutherland ...
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Convert vertices into a set of pixel values through scan conversion. Most scan conversion algorithms are designed for line segments and polygons. ...
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Geometry outside the view volume also behaves very strangely under perspective projection ... Parametric clipping - view line in parametric form and reason ...
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1. Polygon Scan-Conversion. Rasterize a polygon scan line by scan line, determining which ... Find the intersections of the scan line with all polygon edges. ...
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Compositing, Clipping, Curves Week 3, Thu May 26 http://www.ugrad.cs.ubc.ca/~cs314/Vmay2005
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Advanced Rendering II, Clipping I Week 8, Wed Mar 10 http://www.ugrad.cs.ubc.ca/~cs314/Vjan2010
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Clipping II, Hidden Surfaces I Week 8, Fri Mar 9 http://www.ugrad.cs.ubc.ca/~cs314/Vjan2007
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Given a point (x, y) and clipping window (xmin, ymin), (xmax, ymax), determine ... Big Optimization: trivial accepts/rejects ... of (x,y) clip points is ...
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Some optical illusions possible. Parallel lines appear to diverge ... Thus for a simple perspective with the COP at (0,0,0), the image plane at z = d. 35 ...
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An area on a display device to which a window is mapped. ... Pass each pair of adjacent polygon vertices to a window boundary clipper. There are four cases: ...
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Exam questions will require knowledge of Data Structures and General Programming ... We chop each end-point of the line at the 'nearest' window boundary. 1. 2. 3. 4 ...
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Computer Graphics Course Material
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Title: Reactive Robot Navigation based on a Combination of Central and Peripheral Vision Author: Panos Trahanias Last modified by: Panos Trahanias
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Rezanje rt in poligonov
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Main idea: fast computations based on comparing with max/min x, y values of window ... Compare endpoints to determine if they are in/out of the rectangle ...
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... into a set of pixel values through scan conversion. ... Any primitive potentially affects any set of pixels. in the frame buffer/z buffer. Image oriented: ...
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... pixels by graphics hardware, a piece of geometry goes through a number of transformations... Tristimulus of Color Theory. Spectral-response functions of ...
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Title: 3 DIMENSIONAL VIEWING Last modified by: ceng Document presentation format: Custom Other titles: Times New Roman Arial Trebuchet MS StarSymbol Verdana Default ...
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else if code0 AND code1 0000. reject (don't draw) else clip and retest ... else code = code1. dx = x1 x0; dy = y1 y0. if code AND 1000 then begin // ymax ...
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save new clip vert. and ending vert. in in. save ending vert. in out. save new clip vert. out out. save nothing. 9/24/09. University of North Carolina Chapel Hill ...
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Shading (combined with normals and lighting information to compute the color ... Half-toning (dithering) Color-correction. 9. Implementation of Transformation ...
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This space in which the application model is defined. ... correspoding bits in the two outcodes are T. (this means both endpoints are to ...
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... which don't have such problems (OpenGL has tessellate function in glu library) ... OpenGL tessellates concave polygons. Tessellation depends on winding rule ...
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Computer Graphics CSC 830
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Title: PowerPoint Presentation Last modified by: skala Created Date: 1/1/1601 12:00:00 AM Document presentation format: On-screen Show Other titles
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