# velvet-test.rib
# Author: Stephen H. Westin, Ford Motor Company Corporate Design
#  <swestin@ford.com>
# Date: 28 January 1997
#
# Modifications:
#	2001.02.01	westin	Added point source to test retroreflection
#				Added new parameters "backscatter" and
#				"edginess"
#				Tweaked for nicer picture
#		Current mailing address: <westin@graphics.cornell.edu>
#
# This is a single sphere for quick tests of shaders using Velvet
# reflectance.


Display "SHW_velvet.tiff" "file" "rgb"
#Display "velvet" "framebuffer" "rgb"
Format 300 300 1.0

# Correct for monitor gamma of 2.2
Exposure 1.0 2.2

Projection "perspective" "fov" 25

Translate 0 0 500

Rotate -115 1 0 0

WorldBegin

  LightSource "ambientlight" 1 "intensity" .1 "lightcolor" [.6 .6 1]
  LightSource "distantlight" 4 "intensity" 1.0
              "from" [-50 0 200] "to" [0 0 0] "lightcolor" [1 .9 .85]
  LightSource "pointlight" 5 "intensity" 5000.0
              "from" [0 200 50] "lightcolor" [1 .9 .85]

Opacity [1 1 1]

Declare "sheen" "color"
Declare "roughness" "float"
Declare "edginess" "float"
Declare "backscatter" "float"

AttributeBegin
  Attribute "identifier" "name" [ "ball" ]
  Color [.05 0 0]
  Surface "SHW_velvet" "Ks" 0.1 "Kd" 1 "Ka" 0.05 "sheen" [.25 .05 .05]
    "roughness" .1 "edginess" 20 "backscatter" 0.1
  Sphere 100 -100 100 360
AttributeEnd

WorldEnd