Computer graphics lecture 15 two dimensional viewing. Professionals, teachers, students and kids trivia quizzes to test your knowledge on the subject. To set a view plane we have to specify a view plane normal vector, n, and a view up vector, up, both, in world coordinates. Persistence is defined as the time it takes the emitted light from the screen to decay to one tenth of its original intensity. Unit i 2d primitives output primitives line, circle and ellipse drawing algorithms attributes of output primitives two dimensional geometric transformation two dimensional viewing line, polygon, curve and text clipping algorithms introduction a picture is completely specified by the set of intensities for the pixel positions in the display. Most graphics packages support rectangular clipping regions some systems support rotated 2d viewing frames, but usually clipping window must. These notes cover the basic theory of two dimensional 2d geometric transforma. Much like what we see in real life through asmall window or the view finder of a camera. The authors, authorities in their field, offer an integrated approach to two dimensional and three dimensional graphics topics. The two dimensional viewing is a transformation process of real world object into position point which is relative to the viewing volume, especially, the points behind the viewer. Cs6504 computer graphics unit iii page 2 perspective projection. In computer graphics, a hardware or software implementation of a digital differential analyzer. It is a method for generating a view of a three dimensional scene is to project points to the display plane alone converging paths. In those applications, the two dimensional image is not just a representation of a realworld object, but an independent artifact with added semantic value.
Gate preparation, nptel video lecture dvd, computer scienceandengineering, computergraphics, two dimensional viewing functions, computer graphics, survey of. Dashed lines connect the controlpoint positions chapter 5 three dimensional graphics i. Clipping is a computer graphics process to remove the lines, objects, or line segments, all of which are outside the viewing pane. In computer graphics one is often con cerned with representing three dimensional objects on a two dimensional display sur face.
Pdf psychophysical support for a twodimensional view. The possible forms of two dimensional graphical output split into two main types computer screens of various sizes, colours and resolutions and hardcopy output such as printers and plotters. We can represent a point in the plane z 0 as p x,y, 0 in the. The mapping of a two dimensional, worldcoordinate scene description to device coordinates two dimensional viewing pipeline cont. Computer graphics multiple choice questions and answerstwo. The second half of the course will cover topics related to three dimensional computer graphics, including 3d representation, illumination, shading, visibility. Computer graphics multiple choice questions and answers. Two dimensional viewing the viewing pipeline a world coordinate area selected for display is called a window. But we can adapt the three dimensional viewing routines to a two dimensional scene, and the core library contains a. Two dimensional viewing functions and clipping cs116a chris pollett nov. Computer graphics lecture notes by shri vishnu engineering college for women. Outline opengl 2d viewing types of clipping algorithms 2d point clipping.
Objects are placed into the scene by modeling transformation to a master coordinate system, referred to as world. Such a representation may attempt either to show the general appearance of an object, as in a photograph, or to depict the object so that its metric properties such as. The ms complex also provides the ability to restrict simpli. It is a two dimensional array having columns and rows. To three dimensional computer graphics by leonard mcmillan jr. Use viewing coordinates reference frame to provide a method for setting up. Computer graphics mcq multiple choice questions with answers. We can represent a point in the plane z 0 as p x,y, 0 in the three dimensional world, or as p x, y in the two dimensional plane. An area on a display device to which a window is mapped is called a view port. Mcq quiz on computer graphics multiple choice questions and answers on computer graphics mcq questions quiz on computer graphics objectives questions with answer test pdf for interview preparations, freshers jobs and competitive exams. Viewport transformations opengl 2d viewing functions opengl 2d viewing program example.
Psychophysical support for a two dimensional view interpolation theory of object recognition regularization networks computer graphics. Computer graphics lecture 15 two dimensional viewing we now consider the formal mechanism for displaying views of a picture on an output device. World coordinate system can be aligned with the viewing coordinate system in two steps. Opengl twodimensional viewing functions computer graphics. Two dimensional rotations, on the other hand, are always around an axis that is perpendicular to the xy plane. Hence, statementsboth practical and abstractabout the larger three dimensional world hold for the simpler two dimensional world. Cs8092 question bank computer graphics and multimedia. But we can adapt the three dimensional viewing routines to a two dimensional scene, and the core library contains a viewport function. The authors, authorities in their field, offer an integrated approach to two dimensional and three dimensional graphics. In computer graphics many applications need to alter or manipulate a picture, for. It is a formal mechanism for displaying viewsof a picture on an output device.
Graphics programming department of computer science. The result is a graphic that contains conceptual properties to interpret that the figure or image is not actually flat 2d, but rather, is a solid object 3d being viewed on a 2d display. Two dimensional viewing viewing pipeline, viewing coordinate reference frame. The mapping of a twodimensional, world coordinate scene. A graphicspackage allows the user to specifya which part of the defined picture is to be displayed. Computer viewing cs 537 interactive computer graphics. Computer graphics two dimensional viewing functions exam. A view system b view plane c view volume d all the above. Two projections to create viewing volume orthographic projection objects rendered are not affected by the distance e. A set of unit vectors that define the viewing coordinate system is obtained by. Assuming no background in computer graphics, this junior to graduatelevel textbook presents basic principles for the design, use, and understanding of computer graphics systems and applications.
The two dimensional viewing pipeline clipping window the part of two dimensional scene that it to be displayed viewport window where data from clipping window will be displayed mapping between these two called 2d viewing transformation clipping window viewport. Transformations play an important role in computer graphics to reposition. Computer graphics two dimensional transformations edited by dr. The vibrations of the mirror are synchronized with the display of the scene on the crt. Two dimensional viewing in computer graphics pdf lasopanic.
Computer graphics twodimensional viewing 2 d computer. A directory of objective type questions covering all the computer science subjects. The 2d viewing pipeline describes this process for 2d data. Since clipping is a very common operation it has to be performed simply and quickly. Opengl two dimensional viewing functions the basic opengl library has no functions specifically for two dimensional viewing because it is designed primarily for 3d applications. We define a viewing reference system in a phigs application program with the following function. Specifying the viewing coordinates viewing coordinates system, u, v, w, describes 3d objects with respect to a viewer.
Computer graphics cg notes pdf free download 2020 sw. Typically, a graphics package allows a user to specify which part of a defined picture is to be displayed and where that part is. Using vectors n and v, the graphics package computer can. Typically, a graphics package allows a user to specify which part of a defined picture is to be displayed and where that part is to be placed on the display device. Three dimensional and stereoscopic views in stereoscopic views, three dimensional views can be obtained by reflecting a raster image from a vibrating flexible mirror. Multiple choice questions on computer graphics topic two dimensional viewing.
The window defines what is to be viewed the view port defines where it is to be displayed. Set an origin for 2d viewingcoordinate frame at some. Donald hearn and pauline baker m, computer graphics, prentice hall, new delhi. Up is the view up vector, whose projection onto the view plane is directed up. The concept of line clipping is same as point clipping. Mapping the 2d world seen in the window on to the viewport is 2d viewing. In the previous article 37, geometry for n dimensional graphics, we described a family of techniques for dealing with the geometry of n dimensional models in the context of graphics applications. Planar geometric projections and viewing transformations. Two dimension viewing function, computer graphics lecture. Viewing volume viewing volume a closed volume which delimits the infinite 3d space to finite volume. In this course the students will be able to learn basics of computer graphics, output. Computer aided design for engineering and architectural systems, presentation graphics, computer art, scanline polygon fill algorithm, two dimensional transformations, 2 dimensional viewing, 3d object representations, three dimensional transformations, visiblesurface. Two dimension viewing function, computer graphics lecture notes.
Obtain a particular orientation for the window by setting a two dimensional viewing coordinate system in the world coordinate plane and define a window in the viewing coordinate system. Figure 84 a viewing coordinate frame is moved into coincidence with the world coordinate frame by a applying a translation matrix t to move the viewing origin to the world origin, then. Specifying the viewing coordinate system view reference point we first pick a world coordinate position called view reference point origin of our viewing coordinate system. Computer graphics twodimensional viewing free download as pdf file. Changing the viewport position allows for viewing objects at different locations on the display device. We translate a twodimensional point by adding translation. A viewing plane projection plane is set up perpendicular to w and aligned with u,v. In line clipping, we will cut the portion of line which is. Construct the scene in world coordinate using the output primitives and attributes. The maximum number of points that can be displayed without overlap on a crt is referred to as the resolution. By changing clipping window size or position, zooming, overview, or panning effects can be achieved two dimensional viewing pipeline cont. The two dimensional viewing pipeline clipping window the part of two dimensional scene that it to be displayed viewport window where data from. A good dipping algorithm quickly rejects lines that lie outside the viewing area, and since speed is always desirable, algorithms that lend themselves to parallel or.
This makes objects further from the viewing position be displayed smaller than. A dissertation submitted to the faculty of the university of north carolina at chapel hill in partial fulfillment of the requirements for the degree of doctor of philosophy in the department of computer science. Click here to download computer graphics mcq with answers in pdf. Computer graphics two dimensional viewing free download as pdf file.
Mathematically, we view the two dimensional plane, or a simple two dimensional curved surface, as a subspace of a three dimensional space. The view reference point is often chosen to be close to or on the surface of some object, or at the center of a group of objects. Practice these mcq questions and answers for preparation of various competitive and entrance exams. Jul 03, 2019 unit ii two dimensional graphics 9 two dimensional geometric transformations matrix representations and homogeneous coordinates, composite transformations.
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