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More on the graphics pipeline Event driven programming Nintendo ...

Source: www.cs.cmu.edu
Topic: Wii


Short Desciption:
Nintendo Wii. (Michael De Rosa). 2. Review. geometric objects. properties: color move camera and objects around. pixels. graphics pipeline ...

 

Content Inside:
More on the graphics pipeline Event driven programming Nintendo Wii Review Outline Double Buffering: Screen RefreshPage 11More on the graphics pipelineEvent driven programmingNintendo Wii(Michael De Rosa)2Reviewgeometric objectsproperties: colormove camera and objects aroundpixelsgraphics pipelineRotateTranslateScaleIs itvisible?3D to 2DConvert topixelsPrimitives+ materialpropertiesPrimitives3Outline Double Buffering Hidden Surface Removal BackFace CullingPrimitives4Double Buffering: Screen Refresh Common: 60100 Hz Flicker if drawing overlaps screen refresh Problem during animation Example (cube_single.c)pixelsgraphics pipelineCube_sb.exe5Double Buffering: Screen RefreshCube_db.exepixelsgraphics pipeline Solution two frame buffers: Draw into one buffer Swap and display while drawing into other buffer Desirable frame rate >= 30 fps (frames/second)6Enabling Modes glutInitDisplayMode (GLUT_SINGLE); glutInitDisplayMode (GLUT_DOUBLE); draw your scene glutSwapBuffers ();Page 227Outline Double Buffering Hidden Surface Removal BackFace Culling8Hidden Surface Removal What is visible after clipping and projection?9Hidden Surface Removal Objectspace vs imagespace approaches Object space: depth sort (Painters algorithm) Image space: ray cast (zbuffer algorithm)Well get back to this later in the semester inmuch more detail!10Painters Algorithm Render backtofront Paint over invisible polygons How to sort and how to test overlap?11Depth Sorting First sort by furthest distance z from viewer If minimum depth of A is greater than maximumdepth of B A can be drawn before B If either x or y extents do not overlap A and Bcan be drawn independently12Some Difficult Cases Sometimes cannot sort polygons! One solution: compute intersections andsubdivide Do while rasterizing (difficult in object space)Cyclic overlapPiercing PolygonsPage 3313Painters Algorithm Assessment Strengths Simple (most of the time) Handles transparency well Sometimes no need to sort (e.g. heightfield) Weaknesses Clum ...

 

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