Class: Mittsu::GLTFExporter

Inherits:
Object
  • Object
show all
Defined in:
lib/mittsu/gltf/exporter.rb

Constant Summary collapse

COMPONENT_TYPES = 
{
  # 8 bit
  byte: 5120,
  unsigned_byte: 5121,
  # 16 bit
  short: 5122,
  unsigned_short: 5123,
  # 32 bit
  unsigned_int: 5125,
  float: 5126
}.freeze
GPU_BUFFER_TYPES = 
{
  array_buffer: 34962,
  element_array_buffer: 34963
}
ELEMENT_TYPES = 
[
  "SCALAR",
  "VEC2",
  "VEC3",
  "VEC4",
  "MAT2",
  "MAT3",
  "MAT4"
].freeze

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ GLTFExporter

Returns a new instance of GLTFExporter.



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# File 'lib/mittsu/gltf/exporter.rb', line 33

def initialize(options = {})
  @node_indexes = []
  @nodes = []
  @buffers = []
  @meshes = []
  @buffer_views = []
  @accessors = []
  @binary_buffer = nil
end

Instance Method Details

#export(object, filename, mode: :ascii) ⇒ Object Also known as: parse 



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# File 'lib/mittsu/gltf/exporter.rb', line 43

def export(object, filename, mode: :ascii)
  initialize
  object.traverse do |obj|
    @node_indexes << add_mesh(obj, mode: mode) if obj.is_a? Mittsu::Mesh
  end
  json = Jbuilder.new do |json|
    json.asset do
      json.generator "Mittsu-GLTF"
      json.version "2.0"
    end
    json.scene 0
    json.scenes [{
      nodes: @node_indexes
    }]
    json.nodes { json.array! @nodes }
    json.meshes { json.array! @meshes }
    json.buffers { json.array! @buffers }
    json.bufferViews { json.array! @buffer_views }
    json.accessors { json.array! @accessors }
  end.target!
  case mode
  when :ascii
    File.write(filename, json)
  when :binary
    File.open(filename, "wb") do |file|
      size = 12 +
        8 + json.length + padding_required(json, stride: 4) +
        8 + @binary_buffer.length + padding_required(@binary_buffer, stride: 4)
      file.write("glTF")
      file.write([2, size].pack("L<*"))
      write_chunk(file, :json, json)
      write_chunk(file, :binary, @binary_buffer)
    end
  else
    raise ArgumentError "Invalid output mode #{mode}"
  end
end