Lecture 18 Fasih ur Rehman

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Presentation transcript:

Lecture 18 Fasih ur Rehman Computer Graphics Lecture 18 Fasih ur Rehman

Last Class Clipping Modeling Geometry Processing

Today’s Agenda Clipping

Graphical Process Graphical Process is

Rasterization Calculation of pixel values based upon the previous steps i. e. Projection, Primitive assembly, Clipping and Shading The rasterizer starts with vertices in normalized device coordinates but outputs fragments whose locations are in units of the display—window coordinates. Viewport transformation

Normalized Coordinates

Example

Rasterization Calculation of pixel values based upon the previous steps i. e. Projection, Primitive assembly, Clipping and Shading The rasterizer starts with vertices in normalized device coordinates but outputs fragments whose locations are in units of the display—window coordinates. Viewport transformation

Fragment Processing Each fragment is assigned a color by the rasterizer and this color is placed in the frame buffer at the locations corresponding to the fragment’s location. Various possibilities are merging with the results of the geometric pipeline at the rasterization stage. for example shaded and texture-mapped polygon is processed hidden-surface removal process is typically carried out on a fragment-by-fragment basis. Fragment colors may have to be blended with the colors of pixels already in the color buffer due to some translucent object

Display Problems Generally, displaying framebuffer content on the monitor is not of concern of the application program but Jaggedness (rough quality) Aliasing

Clipping Identification of the portions of geometric primitives by analytical calculations within the view windows

Summary Clipping

References Fundamentals of Computer Graphics Third Edition by Peter Shirley and Steve Marschner Interactive Computer Graphics, A Top-down Approach with OpenGL (Sixth Edition) by Edward Angel.