Class: Mittsu::PolyhedronGeometry

Inherits:
Geometry
  • Object
show all
Defined in:
lib/mittsu/extras/geometries/polyhedron_geometry.rb

Instance Attribute Summary

Attributes inherited from Geometry

#bounding_box, #bounding_sphere, #colors, #dynamic, #face_vertex_uvs, #faces, #has_tangents, #id, #line_distances, #morph_colors, #morph_normals, #morph_targets, #name, #skin_indices, #skin_weights, #type, #uuid, #vertices

Instance Method Summary collapse

Methods inherited from Geometry

#apply_matrix, #center, #clone, #compute_bounding_box, #compute_bounding_sphere, #compute_face_normals, #compute_line_distances, #compute_morph_normals, #compute_tangents, #compute_vertex_normals, #dispose, #from_buffer_geometry, #merge, #merge_mesh, #merge_vertices, #to_json

Methods included from EventDispatcher

#add_event_listener, #dispatch_event, #has_event_listener, #remove_event_listener

Constructor Details

#initialize(vertices, indices, radius = 1.0, detail = 0) ⇒ PolyhedronGeometry

Returns a new instance of PolyhedronGeometry.



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# File 'lib/mittsu/extras/geometries/polyhedron_geometry.rb', line 6

def initialize(vertices, indices, radius = 1.0, detail = 0)
  super()

  @type = 'PolyhedronGeometry'

  @parameters = {
    vertices: vertices,
    indices:  indices,
    radius:   radius,
    detail:   detail
  }

  for i in (0...vertices.length).step(3) do
    prepare(Vector3.new(vertices[i], vertices[i + 1], vertices[i + 2]))
  end

  faces = []

  i = 0
  j = 0
  while i < indices.length do
    v1 = @vertices[indices[i]]
    v2 = @vertices[indices[i + 1]]
    v3 = @vertices[indices[i + 2]]

    faces[j] = Face3.new(v1.index, v2.index, v3.index, [v1.clone, v2.clone, v3.clone])

    i += 3
    j += 1
  end

  @centroid = Vector3.new

  for i in 0...faces.length do
    subdivide(faces[i], detail)
  end

  # Handle case when face straddles the seam

  @face_vertex_uvs[0].each do |uv0, uv1, uv2|
    x0 = uv0.x
    x1 = uv1.x
    x2 = uv2.x

    max = [x0, x1, x2].max
    min = [x0, x1, x2].min

    if max > 0.9 && min < 0.1 # 0.9 is somewhat arbitrary
      uv0.x += 1.0 if x0 < 0.2
      uv1.x += 1.0 if x1 < 0.2
      uv2.x += 1.0 if x2 < 0.2
    end
  end

  # Apply radius

  @vertices.each do |v|
    v.multiply_scalar(radius)
  end

  merge_vertices

  compute_face_normals
  @bounding_sphere = Sphere.new(Vector3.new, radius)
end