Graphics Pipeline (Slides courtesy of Tamar Shinar) Graphics - PowerPoint PPT Presentation

Jan 03, 2023 •539 likes •767 views

Graphics Pipeline (Slides courtesy of Tamar Shinar) Graphics Pipeline ff Transform ff Modelview Transformation Object World Eye coordinates coordinates coordinates Model View Project ff Projection: map 3D scene to 2D image

Graphics Pipeline (Slides courtesy of Tamar Shinar)
Graphics Pipeline ff
Transform ff
“Modelview” Transformation Object World Eye coordinates coordinates coordinates Model View
Project ff
Projection: map 3D scene to 2D image OpenGL Super Bible, 5th Ed.
Orthographic projection vector.tutsplus.com
OpenGL Orthogonal Viewing glOrtho(left,right,bottom,top,near,far) View volume for an orthographic projection 8
Perspective projection www.artyfactory.com
OpenGL Perspective Viewing glFrustum(xmin,xmax,ymin,ymax,near,far) View volume (frustrum) for a perspective projection 10
Clip ff
Clip against view volume
Hidden Surface Removal ff
Occlusion “painter’s algorithm” draw primitives in back-to-front order [Wikimedia Commons]
Occlusion “painter’s algorithm” draw primitives in back-to- front order problem : triangle intersection
Occlusion “painter’s algorithm” draw primitives in back-to- front order problem : occlusion cycle
Use a z-buffer for hidden surface removal test depth on a pixel by pixel basis red drawn last without z-buffer with z-buffer
Use a z-buffer for hidden surface removal at each pixel, record distance to the closest object that has been drawn in a depth buffer without z-buffer with z-buffer
Use a z-buffer for hidden surface removal http://www.beyond3d.com/content/articles/41/
Backface culling: another way to eliminate hidden geometry
Hidden Surface Removal in OpenGL glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH ); glEnable( GL_DEPTH_TEST ); glEnable( GL_CULL_FACE ); For a perspective transformation, there is more precision in the depth buffer for z-values closer to the near plane

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