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@prefix owl:     <http://www.w3.org/2002/07/owl#> .
@prefix rdf:     <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#> .
@prefix schema:  <http://schema.org/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix xsd:     <http://www.w3.org/2001/XMLSchema#> .
@prefix x3d:     <https://www.web3d.org/specifications/x3d-4.0.xsd#> .
@prefix x3do:    <https://www.web3d.org/specifications/X3dOntology4.0#> .

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  x3do:content 'Figure20_16SpotLightBeamWidthComparison.x3d' ;
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:meta_1_2 a owl:NamedIndividual, x3do:meta ;
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  x3do:content 'Figure 20.16, The VRML 2.0 Sourcebook, Copyright [1997] By Andrea L. Ames, David R. Nadeau, and John L. Moreland' ;
  x3do:name 'creator' .
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  x3do:content 'Don Brutzman' ;
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  x3do:content '10 September 2000' ;
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  x3do:content '20 October 2019' ;
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  x3do:content 'Three meshes illuminated by separate spotlights, with outer cone set to 45 degrees and inner cones set to 45, 22 1/2, and 1/2 degrees respectively. Combines Figures 20.16a, 16b, 16c.' ;
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:meta dcterms:title "Figure20_16SpotLightBeamWidthComparison.x3d" .
:meta dcterms:creator "Figure 20.16, The VRML 2.0 Sourcebook, Copyright [1997] By Andrea L. Ames, David R. Nadeau, and John L. Moreland" .
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:Scene a owl:NamedIndividual, x3do:Scene ;
  x3do:hasParent :X3D ;
  x3do:hasChildren :WorldInfo_2_1, :Viewpoint_2_2, :Viewpoint_2_3, :Transform_2_4, :Group_2_5, :Transform_2_6 .
:WorldInfo_2_1 a owl:NamedIndividual, x3do:WorldInfo ;
  x3do:hasParent :Scene ;
  x3do:title 'Figure20_16SpotLightBeamWidthComparison.x3d' .
:Viewpoint_2_2 a owl:NamedIndividual, x3do:Viewpoint ;
  x3do:hasParent :Scene ;
  x3do:description 'SpotLights shining on meshes, outer cone 45 degrees. Inner cone varies 90 to 45 to 5 degrees.' ;
  x3do:orientation ( 1 0 0 -0.52 ) ;
  x3do:position ( 0 24 48 ) .
:Viewpoint_2_3 a owl:NamedIndividual, x3do:Viewpoint ;
  x3do:hasParent :Scene ;
  x3do:description 'SpotLight beam differences are more pronounced at narrow angles' ;
  x3do:orientation ( 1 0 0 -0.157 ) ;
  x3do:position ( 0 8 48 ) .
:Transform_2_4 a owl:NamedIndividual, x3do:Transform ;
  x3do:hasParent :Scene ;
  x3do:hasChildren :SpotLight_2_4_1, :FlatMesh ;
  x3do:translation ( -21 0 0 ) .
:SpotLight_2_4_1 a owl:NamedIndividual, x3do:SpotLight ;
  x3do:hasParent :Transform_2_4 ;
  x3do:ambientIntensity 0.5 ;
  x3do:beamWidth 0.785 ;
  x3do:cutOffAngle 0.785 ;
  x3do:direction ( 0 -1 0 ) ;
  x3do:location ( 0 9 0 ) ;
  x3do:radius 12 .
:FlatMesh a owl:NamedIndividual, x3do:Inline ;
  x3do:hasParent :Transform_2_4 ;
  x3do:DEF 'FlatMesh' ;
  x3do:bboxSize ( 16 16 16 ) ;
  x3do:url '"Figure20_05FlatMesh.x3d" "https://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Chapter20Lighting/Figure20_05FlatMesh.x3d" "Figure20_05FlatMesh.wrl" "https://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Chapter20Lighting/Figure20_05FlatMesh.wrl"' .
:Group_2_5 a owl:NamedIndividual, x3do:Group ;
  x3do:hasParent :Scene ;
  x3do:hasChildren :SpotLight_2_5_1, :FlatMesh-USE-1 .
:SpotLight_2_5_1 a owl:NamedIndividual, x3do:SpotLight ;
  x3do:hasParent :Group_2_5 ;
  x3do:ambientIntensity 0.5 ;
  x3do:beamWidth 0.392 ;
  x3do:cutOffAngle 0.785 ;
  x3do:direction ( 0 -1 0 ) ;
  x3do:location ( 0 9 0 ) ;
  x3do:radius 12 .
:FlatMesh-USE-1 a owl:NamedIndividual, x3do:Inline ;
  x3do:hasParent :Group_2_5 ;
  owl:sameAs :FlatMesh . # DEF matching this USE
:Transform_2_6 a owl:NamedIndividual, x3do:Transform ;
  x3do:hasParent :Scene ;
  x3do:hasChildren :SpotLight_2_6_1, :FlatMesh-USE-2 ;
  x3do:translation ( 21 0 0 ) .
:SpotLight_2_6_1 a owl:NamedIndividual, x3do:SpotLight ;
  x3do:hasParent :Transform_2_6 ;
  x3do:ambientIntensity 0.5 ;
  x3do:beamWidth 0.09 ;
  x3do:cutOffAngle 0.785 ;
  x3do:direction ( 0 -1 0 ) ;
  x3do:location ( 0 9 0 ) ;
  x3do:radius 12 .
:FlatMesh-USE-2 a owl:NamedIndividual, x3do:Inline ;
  x3do:hasParent :Transform_2_6 ;
  owl:sameAs :FlatMesh . # DEF matching this USE