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Computer Graphics

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Presentation Transcript

  1. Computer Graphics Lecture 17 FasihurRehman

  2. Last Class • 3D Transforms • Inverse Rotation

  3. Examples

  4. Today’s Agenda • Graphical Processes

  5. Graphical Process • High level graphical process

  6. Implementation Tasks • Four Major Tasks • Modeling • Geometry Processing • Rasterization • Frame Processing

  7. Modeling • The usual results of the modeling process are sets of vertices that specify a group of geometric objects supported by the rest of the system.

  8. Geometry Processing • Geometry processing means todetermine which geometric objects can appear on the display and to assign shades or colors to the vertices of these objects. • Four Tasks • Projection • Primitive assembly • Clipping • Shading • Hidden surface removal and visible surface determination are required

  9. 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

  10. Summary • Graphical Processes

  11. 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.

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