Class: Mittsu::OBJMTLLoader

Inherits:
Object
  • Object
show all
Includes:
EventDispatcher
Defined in:
lib/mittsu/loaders/obj_mtl_loader.rb

Instance Method Summary collapse

Methods included from EventDispatcher

#add_event_listener, #dispatch_event, #has_event_listener, #remove_event_listener

Constructor Details

#initialize(manager = DefaultLoadingManager) ⇒ OBJMTLLoader

Returns a new instance of OBJMTLLoader.



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# File 'lib/mittsu/loaders/obj_mtl_loader.rb', line 5

def initialize(manager = DefaultLoadingManager)
  @manager = manager
end

Instance Method Details

#load(url, mtlurl) ⇒ Object 



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# File 'lib/mittsu/loaders/obj_mtl_loader.rb', line 9

def load(url, mtlurl)
  mtl_loader = MTLLoader.new(File.dirname(url))
  # mtl_loader.cross_origin = @cross_origin # TODO: not needed?
  materials_creator = mtl_loader.load(mtlurl)

  materials_creator.preload

  loader = FileLoader.new(@manager)
  # loader.cross_origin = @cross_origin # TODO: not needed?

  text = loader.load(url)
  object = parse(text)

  object.traverse do |child_object|
    if child_object.is_a?(Mesh) && child_object.material.name && !child_object.material.name.empty?
      material = materials_creator.create(child_object.material.name)
      child_object.material = material if material
    end
  end

  object
end

#parse(data) ⇒ Object 



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# File 'lib/mittsu/loaders/obj_mtl_loader.rb', line 32

def parse(data)
  @face_offset = 0
  @group = Group.new
  @object = @group

  @geometry = Geometry.new
  @material = MeshLambertMaterial.new
  @mesh = Mesh.new(@geometry, @material)

  @vertices = []
  @normals = []
  @uvs = []

  # v float float float
  vertex_pattern = /v( +[\d|.|+|\-|e]+)( +[\d|.|+|\-|e]+)( +[\d|.|+|\-|e]+)/

  # vn float float float
  normal_pattern = /vn( +[\d|.|+|\-|e]+)( +[\d|.|+|\-|e]+)( +[\d|.|+|\-|e]+)/

  # vt float flot
  uv_pattern = /vt( +[\d|.|+|\-|e]+)( +[\d|.|+|\-|e]+)/

  # f vertex vertex vertex
  face_pattern1 = /f( +\d+)( +\d+)( +\d+)?/

  # f vertex/uv vertex/uv vertex/uv
face_pattern2 = /f( +(\d+)\/(\d+))( +(\d+)\/(\d+))( +(\d+)\/(\d+))( +(\d+)\/(\d+))?/

# f vertex/uv/normal vertex/uv/normal vertex/uv/normal ...
face_pattern3 = /f( +(\d+)\/(\d+)\/(\d+))( +(\d+)\/(\d+)\/(\d+))( +(\d+)\/(\d+)\/(\d+))( +(\d+)\/(\d+)\/(\d+))?/

# f vertex//normal vertex//normal vertex//normal ...
face_pattern4 = /f( +(\d+)\/\/(\d+))( +(\d+)\/\/(\d+))( +(\d+)\/\/(\d+))( +(\d+)\/\/(\d+))?/

  lines = data.split("\n")

  lines.each do |line|
  line = line.strip

  next if line.empty? || line.start_with?('#')

  if vertex_pattern =~ line
    # ["v 1.0 2.0 3.0", "1.0", "2.0", "3.0"]
    @vertices << vector($1.to_f, $2.to_f, $3.to_f)
  elsif normal_pattern =~ line
    # ["vn 1.0 2.0 3.0", "1.0", "2.0", "3.0"]
    @normals << vector($1.to_f, $2.to_f, $3.to_f)
  elsif uv_pattern =~ line
    # ["vt 0.1 0.2", "0.1", "0.2"]
    @uvs << uv($1.to_f, $2.to_f)
  elsif face_pattern1 =~ line
    # ["f 1 2 3", "1", "2", "3", undefined]
    handle_face_line([ $1, $2, $3, $4 ])
  elsif face_pattern2 =~ line
    # ["f 1/1 2/2 3/3", " 1/1", "1", "1", " 2/2", "2", "2", " 3/3", "3", "3", undefined, undefined, undefined]
    handle_face_line(
      [ $2, $5, $8, $11 ], #faces
      [ $3, $6, $9, $12 ] #uv
    )
  elsif face_pattern3 =~ line
    # ["f 1/1/1 2/2/2 3/3/3", " 1/1/1", "1", "1", "1", " 2/2/2", "2", "2", "2", " 3/3/3", "3", "3", "3", undefined, undefined, undefined, undefined]
    handle_face_line(
      [ $2, $6, $10, $14 ], #faces
      [ $3, $7, $11, $15 ], #uv
      [ $4, $8, $12, $16 ] #normal
    )
  elsif face_pattern4 =~ line
    # ["f 1//1 2//2 3//3", " 1//1", "1", "1", " 2//2", "2", "2", " 3//3", "3", "3", undefined, undefined, undefined]
    handle_face_line(
      [ $2, $5, $8, $11 ], #faces
      [ ], #uv
      [ $3, $6, $9, $12 ] #normal
    )
  elsif /^o / =~ line
    # object
    mesh_n
    @face_offset = @face_offset + @vertices.length
    @vertices = []
    object = Object3D.new
    object.name = line[2..-1].strip
    @group.add(object)
  elsif /^g / =~ line
    # group
    mesh_n(line[2..-1].strip, nil)
  elsif /^usemtl / =~ line
    # material
    mesh_n(nil, line[7..-1].strip)
  elsif /^mtllib / =~ line
    # mtl file

      # TODO: ???
    # if mtllib_callback
    #   mtlfile = line[7..-1].strip
    #   mtllib_callback.(mtlfile)
    # end
  elsif /^s / =~ line
    # Smooth shading
  else
    puts "Mittsu::OBJMTLLoader: Unhandled line #{line}"
  end
  end

  mesh_n(nil, nil)

  @group
end