# Example 3: a Viewpoint for the clash in 02-topic-comment.ttl.
# Part A is the view itself: a virtual camera, its pose in the model and the
# rendered image. These exist without BCF. Part B is the BCF Viewpoint that refers
# to them and adds the visual state for the viewer. Part C is a second viewpoint
# with an orthogonal camera. The project and the model are from 01-project.ttl.

@prefix bcfOWL:  <https://w3id.org/bcfOWL#> .
@prefix dcat:    <http://www.w3.org/ns/dcat#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix gom:     <https://w3id.org/gom#> .
@prefix prov:    <http://www.w3.org/ns/prov#> .
@prefix sosa:    <http://www.w3.org/ns/sosa/> .
@prefix spot:    <https://w3id.org/spot#> .
@prefix spot-sg: <https://w3id.org/spot/sg#> .
@prefix xsd:     <http://www.w3.org/2001/XMLSchema#> .
@prefix ex:      <https://example.org/bcfowl-example#> .

#################################################################
# A. THE VIEW (no BCF)
#################################################################

# The virtual camera of the viewer application, and the viewer as software agent.
ex:viewer_camera a sosa:Sensor.
ex:bim_viewer a prov:SoftwareAgent.

# The observation is the hub: everything else hangs off it.
ex:view1 a sosa:Observation, prov:Activity;
  sosa:madeBySensor ex:viewer_camera;
  sosa:hasFeatureOfInterest ex:federated_model;
  sosa:resultTime "2026-03-12T09:05:00"^^xsd:dateTime;
  sosa:hasResult ex:snapshot1;
  prov:wasAssociatedWith ex:bim_viewer;
  prov:used ex:viewer_camera;
  # projection parameters
  bcfOWL:hasFieldOfView "60.0"^^xsd:double;
  bcfOWL:hasAspectRatio "1.7777777778"^^xsd:double.

# Pose of the camera in the model at this view. It represents the view, not the device.
ex:view1_pose a spot:PointSpace;
  spot:represents ex:view1;
  spot:hasAppearance [
    a spot:EntityAppearance;
    spot:appearsIn ex:building_space;
    gom:hasTransformationMatrix "[0.707,0.707,0,0,-0.354,0.354,0.866,0,0.612,-0.612,0.5,0,24.5,18.0,9.2,1]"^^gom:columnMajorArray
  ].

# The rendered image, also the SOSA result.
ex:snapshot1 a dcat:Dataset, sosa:Result;
  prov:wasGeneratedBy ex:view1;
  dcat:distribution [
    a dcat:Distribution;
    dcat:downloadURL <https://example.org/snapshots/clash-d204-b117.png>;
    dcat:mediaType "image/png"
  ].

# Optional pixel layer, only for mapping image pixels to model coordinates.
ex:snapshot1_space a spot:AreaSpace;
  spot:represents ex:snapshot1;
  spot-sg:hasBoundingBox "[0,0,0,1920,1080,0]"^^spot-sg:boundingBoxArray;
  spot:hasAppearance [
    a spot:EntityAppearance;
    spot:appearsIn ex:view1_pose;
    gom:hasTransformationMatrix "[...]"^^gom:columnMajorArray
  ].

#################################################################
# B. THE BCF VIEWPOINT
#################################################################

ex:viewpoint1 a bcfOWL:Viewpoint;
  bcfOWL:hasProject ex:project;
  bcfOWL:hasTopic ex:topic1;
  dcterms:identifier "8c61fb85-b73e-4182-988f-d7e5988d348d";
  dcterms:creator ex:clash_detector;
  dcterms:created "2026-03-12T09:05:00Z"^^xsd:dateTime;
  # the view and its image
  bcfOWL:hasPerspectiveCamera ex:view1;
  bcfOWL:hasSnapshot ex:snapshot1;
  # default visibility and view-setup hints
  bcfOWL:hasDefaultVisibility true;
  bcfOWL:spacesVisible false;
  bcfOWL:spaceBoundariesVisible false;
  bcfOWL:openingsVisible true;
  # The two clashing elements are selected.
  bcfOWL:hasSelectedComponent ex:component_duct, ex:component_beam;
  # The ceiling is hidden. It would hide the duct from this angle.
  bcfOWL:hasVisibilityException ex:component_ceiling;
  # The duct is red and the beam is yellow (RRGGBB).
  bcfOWL:hasColoring [
    a bcfOWL:Coloring;
    bcfOWL:hasColor "FF0000";
    bcfOWL:hasComponent ex:component_duct
  ], [
    a bcfOWL:Coloring;
    bcfOWL:hasColor "FFD500";
    bcfOWL:hasComponent ex:component_beam
  ];
  # Cut away the model above the ceiling level of level 2.
  bcfOWL:hasClippingPlane [
    a bcfOWL:ClippingPlane;
    bcfOWL:hasLocation "[24.5,18.0,7.4]"^^bcfOWL:point3D;
    bcfOWL:hasDirection "[0.0,0.0,1.0]"^^bcfOWL:vector3D
  ];
  # A line markup that shows the penetration depth.
  bcfOWL:hasLine [
    a bcfOWL:Line;
    bcfOWL:hasStartPoint "[26.1,18.0,6.62]"^^bcfOWL:point3D;
    bcfOWL:hasEndPoint "[26.1,18.0,6.70]"^^bcfOWL:point3D
  ].

# Components refer to the building element by IRI. The IFC GUID is the fallback
# for tools that do not use IRIs.
ex:component_duct a bcfOWL:Component;
  bcfOWL:hasElement ex:duct_d204;
  bcfOWL:hasIfcGuid "2O2Fr$t4X7Zf8NOew3FLOH";
  bcfOWL:hasAuthoringToolId "D-204";
  bcfOWL:hasOriginatingSystem ex:mep_tool.

ex:component_beam a bcfOWL:Component;
  bcfOWL:hasElement ex:beam_b117;
  bcfOWL:hasIfcGuid "3Yb7mQ1Hn5AwK$d0R8Vt2c";
  bcfOWL:hasAuthoringToolId "B-117";
  bcfOWL:hasOriginatingSystem ex:structure_tool.

# A component can be given by IFC GUID only.
ex:component_ceiling a bcfOWL:Component;
  bcfOWL:hasIfcGuid "1lXv3sKj90Cw8$b5TqP4eD".

# Software with which the elements were created.
ex:mep_tool a bcfOWL:OriginatingSystem;
  dcterms:title "MEP authoring tool".

ex:structure_tool a bcfOWL:OriginatingSystem;
  dcterms:title "Structural analysis and design tool".

#################################################################
# C. A SECOND VIEWPOINT: orthogonal plan view of level 2
#################################################################

# The view-to-world scale and the aspect ratio belong to the observation.
ex:viewpoint2 a bcfOWL:Viewpoint;
  bcfOWL:hasProject ex:project;
  bcfOWL:hasTopic ex:topic1;
  dcterms:identifier "e02f1c5a-6f4b-4f0e-9a43-5f9c3d1a7b88";
  bcfOWL:hasOrthogonalCamera ex:view2;
  bcfOWL:hasSelectedComponent ex:component_duct, ex:component_beam.

ex:view2 a sosa:Observation;
  bcfOWL:hasViewToWorldScale "12.5"^^xsd:double;
  bcfOWL:hasAspectRatio "1.7777777778"^^xsd:double.