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3D Viewing & Clipping

3D Viewing & Clipping Where Where do do geometries geometries come come from? from? Pin-hole camera Pin-hole camera Perspective Perspective projection projection Viewing Viewing transformation transformation Clipping Clipping lines lines &. & polygons polygons Angel Chapter 5. Getting Geometry on the Screen Given geometry in the world coordinate system, how do we get it to the display? Transform to camera coordinate system Transform (warp) into canonical view volume Clip Project to display coordinates (Rasterize). 1. Vertex Transformation Pipeline Vertex Eye coordinates ModelView matrix Projection Image plane coordinates matrix and perspective division Viewport transformation Window coordinates Vertex Transformation Pipeline Vertex glMatrixMode(GL_MODELVIEW). Eye coordinates ModelView matrix glMatrixMode(GL_PROJECTION). Projection Image plane coordinates matrix and glViewport( ). perspective division Viewport transformation Window coordinates 2.

– lines are projected by projecting end points only F Image World I W Note: Since we don’t want the image to be inverted, from now on we’ll put F behind the image plane. Note: Since we don’t want the image to be inverted, from now on we’ll put F …

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