Computer Graphics Programming I - FreeDesktop.Org

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Heightbased Fog Fog factor is given by:Where:e − ∫ ABtdt is the fog density functionA and B are points in space● This integral gives the “optical depth”.● One simplifying assumption: depends only onheight20-November-2007 © Copyright Ian D. Romanick 2007
Heightbased Fog (cont.) Two components to the optical distancebetween the eye and the fogged point:● Change in altitude: y = y point– y eye● Distance in the plane: D = ((X point– X eye) 2 + (Z point–Z eye) 2 ) Two important cases:● y 0: D × y point● y 0:2×∫ 1 Dy point y yeye ydy20-November-2007 © Copyright Ian D. Romanick 2007
Page 1 and 2: Computer Graphics Programming I Age
Page 3: Fog Parameters Fog has 4 main param
Page 8 and 9: Heightbased Fog (cont.) Store a l
Page 10 and 11: Radial Fog GL_FRAGMENT_DEPTH based
Page 12 and 13: Blending Typically used for one of
Page 14 and 15: GL_EXT_blend_colorC srcF src C dst
Page 16 and 17: Blend Equation C dstC src× ×F src
Page 18 and 19: Referenceshttp://en.wikipedia.org/w
Page 20 and 21: Multipass Rendering Please...no 5
Page 22 and 23: Problems with Multipass Why do we
Page 24 and 25: Problems with Multipass Why do we
Page 26 and 27: Referenceshttp://www.bluesnews.com/
Page 28: Legal Statement This work represent

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