Class: Mittsu::RingGeometry

Inherits:
Geometry show all
Defined in:
lib/mittsu/extras/geometries/ring_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, #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(inner_radius = 0.0, outer_radius = 50.0, theta_segments = 8, phi_segments = 8, theta_start = 0.0, theta_length = (::Math::PI * 2.0)) ⇒ RingGeometry

Returns a new instance of RingGeometry.



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
 
# File 'lib/mittsu/extras/geometries/ring_geometry.rb', line 6

def initialize(inner_radius = 0.0, outer_radius = 50.0, theta_segments = 8, phi_segments = 8, theta_start = 0.0, theta_length = (::Math::PI * 2.0))
  super()

  @type = 'RingGeometry'

  @parameters = {
    inner_radius:   inner_radius,
    outer_radius:   outer_radius,
    theta_segments: theta_segments,
    phi_segments:   phi_segments,
    theta_start:    theta_start,
    theta_length:   theta_length
  }

  theta_segments = [3, theta_segments].max
  phi_segments = [1, phi_segments].max

  uvs = []
  radius = inner_radius
  radius_step = ((outer_radius - inner_radius) / phi_segments.to_f)

  for i in 0..phi_segments do # concentric circles inside ring
    for o in 0..theta_segments do # number of segments per circle
      vertex = Vector3.new
      segment = theta_start + o.to_f / theta_segments.to_f * theta_length
      vertex.x = radius * ::Math.cos(segment)
      vertex.y = radius * ::Math.sin(segment)

      @vertices << vertex
      uvs << Vector2.new((vertex.x / outer_radius + 1.0) / 2.0, (vertex.y / outer_radius + 1.0) / 2.0)
    end

    radius += radius_step
  end

  n = Vector3.new(0.0, 0.0, 1.0)

  for i in 0...phi_segments do # concentric circles inside ring
    theta_segment = i * (theta_segments + 1)

    for o in 0...theta_segments do # number of segments per circle
      segment = o + theta_segment

      v1 = segment
      v2 = segment + theta_segments + 1
      v3 = segment + theta_segments + 2

      @faces << Face3.new(v1, v2, v3, [n.clone, n.clone, n.clone])
      @face_vertex_uvs[0] << [uvs[v1].clone, uvs[v2].clone, uvs[v3].clone]

      v1 = segment
      v2 = segment + theta_segments + 2
      v3 = segment + 1

      @faces << Face3.new(v1, v2, v3, [n.clone, n.clone, n.clone])
      @face_vertex_uvs[0] << [uvs[v1].clone, uvs[v2].clone, uvs[v3].clone]
    end
  end

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

Instance Method Details

#clone ⇒ Object 



69
70
71
72
73
74
75
76
77
78
 
# File 'lib/mittsu/extras/geometries/ring_geometry.rb', line 69

def clone
  RingGeometry.new(
    @parameters[:inner_radius],
    @parameters[:outer_radius],
    @parameters[:theta_segments],
    @parameters[:phi_segments],
    @parameters[:theta_start],
    @parameters[:theta_length]
  )
end