##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" ["/bmrt2.6/shaders:.:shaders:&"]
#Option "radiosity" 120
Display "levoy.tif" "file" "rgba"   
Format 480 360 -1
Exposure 1 2.4
PixelSamples 1 1
Projection "perspective" "fov" 90
#Translate 0 -2 8
#Translate 0 -2 1.5
Translate 0 0 -2
#Rotate -10 0 1 0	#camera 10 deg. left


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
Attribute "radiosity" "emissioncolor" [0.2 0.5 0.8]

AttributeBegin
  Color  [ 0.2 0.0 0.0  ] 
  Surface "matte"
  Polygon "P"  [ -5 -5 0 5 -5 0 5 5 0 -5 5 0  ] 
AttributeEnd


AttributeBegin

  Translate 0 0 2.5
  Rotate 0 0 1 0                
  Color [1 .45 .06]
  Surface "levoy3" "float xpanels" 8.0 "float ypanels" 16.0
    "filename" "enginel.tif"
    "float skip_below" 0.1
    "float stepsize" 0.005          
    "float isovalue" -1          
    "float isovaluealpha" 10     
    "float isovaluethickness" 0.1 
    "color mat0_color" [0 0 0] "float mat0_alpha" 3 "float mat0_value" 0.5    
    "color mat1_color" [0 0 1] "float mat1_alpha" 3 "float mat1_value" 0.5    
    "color mat2_color" [0 1 0] "float mat2_alpha" 3 "float mat2_value" 0.5    
    "color mat3_color" [0 1 1] "float mat3_alpha" 3 "float mat3_value" 0.5    
    "color mat4_color" [1 0 0] "float mat4_alpha" 3 "float mat4_value" 0.5    
  Polygon "P"  [ -.5 -.5 0 .5 -.5 0 .5 .5 0 -.5 .5 0  ]		#unten
  Polygon "P"  [ -.5 .5 1 .5 .5 1 .5 -.5 1 -.5 -.5 1  ] 	#oben
  Polygon "P"  [ -.5 -.5 0 -.5 -.5 1 .5 -.5 1 .5 -.5 0  ]	#hinten
  Polygon "P"  [ .5 -.5 0 .5 -.5 1 .5 .5 1 .5 .5 0  ]		#rechts
  Polygon "P"  [ -.5 .5 0 -.5 .5 1 -.5 -.5 1 -.5 -.5 0  ] 	#links
  Polygon "P"  [ .5 .5 0 .5 .5 1 -.5 .5 1 -.5 .5 0  ]		#vorne
AttributeEnd

WorldEnd