Class: Mittsu::LatheGeometry

Inherits:
Geometry show all
Defined in:
lib/mittsu/extras/geometries/lathe_geometry.rb

Constant Summary

Constants included from OpenGLGeometryLike

OpenGLGeometryLike::CONST_BUFFER_NAMES

Instance Attribute Summary

Attributes inherited from Geometry

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

Attributes included from OpenGLGeometryLike

#custom_attributes_list, #face_count, #faces3, #initted_arrays, #line_count, #morph_normals_arrays, #morph_normals_buffers, #morph_targets_arrays, #morph_targets_buffers, #num_morph_normals, #num_morph_targets, #num_vertices, #particle_count, #renderer, #type_array, #vertex_array_object

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, #create_line_buffers, #create_particle_buffers, #dispose, #from_buffer_geometry, #init_geometry_groups, #init_line_buffers, #init_particle_buffers, #merge, #merge_mesh, #merge_vertices, #set_line_buffers, #set_particle_buffers, #to_json

Methods included from OpenGLGeometryLike

#bind_vertex_array_object, #update_other_buffers, #update_vertex_buffer

Methods included from EventDispatcher

#add_event_listener, #dispatch_event, #has_event_listener, #remove_event_listener

Constructor Details

#initialize(points, segments = 12, phi_start = 0.0, phi_length = (::Math::PI * 2.0)) ⇒ LatheGeometry

Returns a new instance of LatheGeometry.



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
68
69
70
71
72
73
74
75
76
 
# File 'lib/mittsu/extras/geometries/lathe_geometry.rb', line 6

def initialize(points, segments = 12, phi_start = 0.0, phi_length = (::Math::PI * 2.0))
  super()

  @type = 'LatheGeometry'

  @parameters = {
    points:     points,
    segments:   segments,
    phi_start:  phi_start,
    phi_length: phi_length
  }

  inverse_point_length = 1.0 / (points.length.to_f - 1.0)
  inverse_segments = 1.0 / segments.to_f

  for i in 0..segments do
    phi = phi_start + i.to_f * inverse_segments * phi_length

    c = ::Math.cos(phi)
    s = ::Math.sin(phi)

    for j in 0...points.length do
      pt = points[j]

      vertex = Vector3.new

      vertex.x = c * pt.x
      vertex.y = pt.y
      vertex.z = s * pt.x

      @vertices << vertex
    end
  end

  np = points.length

  for i in 0...segments do
    for j in 0...(points.length - 1) do
      base = j + np * i
      a = base
      b = base + np
      c = base + 1 + np
      d = base + 1

      u0 = i.to_f * inverse_segments
      v0 = j.to_f * inverse_point_length
      u1 = u0 + inverse_segments
      v1 = v0 + inverse_point_length

      @faces << Face3.new(a, b, d)

      @face_vertex_uvs[0] << [
        Vector2.new(u0, v0),
        Vector2.new(u1, v0),
        Vector2.new(u0, v1)
      ]

      @faces << Face3.new(b, c, d)

      @face_vertex_uvs[0] << [
        Vector2.new(u1, v0),
        Vector2.new(u1, v1),
        Vector2.new(u0, v1)
      ]
    end
  end

  merge_vertices
  compute_face_normals
  compute_vertex_normals
end