##RenderMan RIB-Structure 1.0
version 3.03

###########################################################################
#
# This RIB file give a demonstration of the use of automatic shadows
# which can be attenuated by opacity of individual objects.
#
# Casting shadows:
#    By default, light sources do not cast shadows.  The following RIB
#    sets a nonstandard attribute which causes any subsequently declared
#    light sources to automatically cast shadows using ray tracing:
#              Declare "shadows" "string"
#              Attribute "light" "shadows" "on"
#              LightSource ....
#    This attribute "affixes" itself to the lightsource when it's
#    declared.  Note that it can be pushed and popped by AttributeBegin/End,
#    just like any other attribute.
#
# Occluder options:
#    When a light source casts shadows, by default the object casts a
#    shadow which blocks out light according to the Opacity in effect
#    when the object was declared.  For some complex objects (like the
#    ones in this scene), the surface shader needs to be evaluated before
#    the renderer can know exactly what the opacity needs to be.  This
#    is slower than the default, and only needs to be done when the 
#    surface shader causes the opacity to change across the surface.  In
#    this case, the proper attribute to set is:
#           Declare "casts_shadows" "string"
#           Attribute "render" "casts_shadows" "shade"
#
# These attributes are all described in the "BMRT User Guide".
#
###########################################################################

Option "searchpath" "shader" [".:../shaders:&"]
Display "shadtest.tif" "file" "rgba"
## Output was balls1 renamed to fit in RMR -- tal 4/25/98
Format 480 360 -1
PixelSamples 1 1
Projection "perspective" "fov" 45
Translate 0 -2 8
Rotate -110 1 0 0


WorldBegin

LightSource "ambientlight" 1 "intensity" 0.08

Declare "shadows" "string"
Attribute "light" "shadows" "on"
LightSource "distantlight" 1 "from" [0 1 4] "to" [0 0 0] "intensity" 0.8

AttributeBegin
#  Attribute "render" "casts_shadows" "none"
  Color  [ 0.7 0.7 0.7  ] 
  Surface "matte"
  Polygon "P"  [ -5 -5 0 5 -5 0 5 5 0 -5 5 0  ] 
AttributeEnd

AttributeBegin
  Translate -2.25 0 2
  Color [1 .45 .06]
  Surface "screen" "Kd" 0.2 "Ks" 0.8 "roughness" 0.15 "specularcolor" [1 .5 .1]
  Sphere 1 -1 1 360
AttributeEnd

AttributeBegin
  Translate 0 0 2
  Declare "casts_shadows" "string"
  Attribute "render" "casts_shadows" "shade"
  Color [1 .45 .06]
  Surface "screen_aa" "Kd" 0.2 "Ks" 0.8 "roughness" 0.15 "specularcolor" [1 .5 .1]
  Sphere 1 -1 1 360
AttributeEnd

AttributeBegin
  Translate 2.25 0 2
  Declare "casts_shadows" "string"
  Attribute "render" "casts_shadows" "shade"
  Surface "funkyglass" "roughness" 0.06
  Sphere 1 -1 1 360
AttributeEnd

WorldEnd