Computer Graphics Programming I - FreeDesktop.Org

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Radial Fog GL_FRAGMENT_DEPTH based fog generatesincorrect values away from the screen center● It uses the distance from the near plane instead ofthe distance from the eye.● Could fix by calculatingtrue distance on CPU andusing explicit fogcoordinates.20-November-2007 © Copyright Ian D. Romanick 2007
Radial Fog (cont.) GL_NV_fog_distance also fixes this.● Adds new fog param GL_FOG_DISTANCE_MODE_NV● Three possible values:• GL_EYE_PLANE: Fog coord is Z value in eye-space• GL_EYE_PLANE_ABSOLUTE_NV: Fog coord is ∣Z∣ valuein eye-space● This is the “usual” approximation allowed by the OpenGL spec• GL_EYE_RADIAL_NV: Fog coord is the distance of thepoint to the eye20-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 6 and 7: Heightbased Fog Fog factor is giv
Page 8 and 9: Heightbased Fog (cont.) Store a l
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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