# planet.rib
#
# Test file for the venus.sl shader.  See pp. 277-279.
#
# Reference:
#    _Texturing and Modeling: A Procedural Approach_, by David S. Ebert, ed.,
#    F. Kenton Musgrave, Darwyn Peachey, Ken Perlin, and Steven Worley.
#    Academic Press, 1994.  ISBN 0-12-228760-6.
#
# 

version 3.03
ShadingRate 1
Display "planet.tif" "file" "rgb"
Format 400 400 1

Projection "perspective" "fov" 35
Rotate -90 1 0 0
Translate 0 -5 0

WorldBegin

  LightSource "ambientlight" 1 "intensity" [0.025]
  Declare "shadows" "string"
  Attribute "light" "shadows" "on"
  LightSource "distantlight" 2 "from" [1 1 .1] "to" [0 0 0]

  AttributeBegin
    Declare "pswidth" "float"
    Declare "frequency" "float"
    Declare "casts_shadows" "string"
    Attribute "render" "casts_shadows" "none"
    Surface "starfield" "pswidth" .25 "frequency" 3 "intensity" 2
    Sphere 100 -100 100 360
  AttributeEnd

  AttributeBegin
    Declare "sea_level" "float"
    Rotate 90 0 0 1
    Surface "terran" "sea_level" 0.15
    Color [.05 .05 .4]
    Sphere 1 -1 1 360
  AttributeEnd

  AttributeBegin
    Declare "casts_shadows" "string"
    Attribute "render" "casts_shadows" "shade"
    Declare "offset" "float"
    Surface "planetclouds" "offset" 0.25
    Sphere 1.02 -1.02 1.02 360
  AttributeEnd

WorldEnd