Class: Mittsu::BufferGeometry

Inherits:
Object
  • Object
show all
Includes:
EventDispatcher, OpenGLGeometryLike
Defined in:
lib/mittsu/core/buffer_geometry.rb,
lib/mittsu/renderers/opengl/core/buffer_geometry.rb

Defined Under Namespace

Classes: DrawCall

Constant Summary

Constants included from OpenGLGeometryLike

OpenGLGeometryLike::CONST_BUFFER_NAMES

Instance Attribute Summary collapse

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 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 ⇒ BufferGeometry

Returns a new instance of BufferGeometry.



12
13
14
15
16
17
18
19
20
21
22
23
24
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 12

def initialize
  @id = (@@id ||= 1).tap { @@id += 1 }

  @uuid = SecureRandom.uuid

  @name = ''
  @type = 'BufferGeometry'

  @attributes = {}

  @draw_calls = []
  @_listeners = {}
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def attributes
  @attributes
end

#bounding_box ⇒ Object (readonly)

Returns the value of attribute bounding_box.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def bounding_box
  @bounding_box
end

#bounding_sphere ⇒ Object (readonly)

Returns the value of attribute bounding_sphere.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def bounding_sphere
  @bounding_sphere
end

#draw_calls ⇒ Object (readonly)

Returns the value of attribute draw_calls.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def draw_calls
  @draw_calls
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def id
  @id
end

#initted ⇒ Object

Returns the value of attribute initted.



5
6
7
 
# File 'lib/mittsu/renderers/opengl/core/buffer_geometry.rb', line 5

def initted
  @initted
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def name
  @name
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def type
  @type
end

#uuid ⇒ Object (readonly)

Returns the value of attribute uuid.



10
11
12
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 10

def uuid
  @uuid
end

Instance Method Details

#[](key) ⇒ Object 



34
35
36
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 34

def [](key)
  @attributes[key]
end

#[]=(key, value) ⇒ Object 



30
31
32
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 30

def []=(key, value)
  @attributes[key] = value
end

#add_draw_call(start, count, index_offset = 0) ⇒ Object 



38
39
40
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 38

def add_draw_call(start, count, index_offset = 0)
  @draw_calls << DrawCall.new(start, count, index_offset)
end

#apply_matrix(matrix) ⇒ Object 



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
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 42

def apply_matrix(matrix)
  position = @attributes[:position]

  if position
    matrix.apply_to_vector3_array(position.array)
    position.needs_update = true
  end

  normal = @attributes[:normal]

  if normal
    normal_matrix = Mittsu::Matrix3.new.normal_matrix(matrix)

    normal_matrix.apply_to_vector3_array(normal.array)
    normal.needs_update = true
  end

  if @bounding_box
    self.compute_bounding_box
  end

  if @bounding_sphere
    self.compute_bounding_sphere
  end

  nil
end

#center ⇒ Object 



70
71
72
73
74
75
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 70

def center
  self.computer_bounding_box
  @bounding_boc.center.negate.tap do |offset|
    self.apply_matrix(Mittsu::Matrix4.new.set_position(offset))
  end
end

#clone ⇒ Object 



649
650
651
652
653
654
655
656
657
658
659
660
661
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 649

def clone
  geometry = Mittsu::BufferGeometry.news

  @attributes.each do |key, attribute|
    geometry[key] = attribute.clone
  end

  @draw_calls.each do |draw_call|
    geometry.draw_calls << DrawCall.new(draw_call.start, draw_call.count, draw_call.index)
  end

  geometry
end

#compute_bounding_box ⇒ Object 



128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 128

def compute_bounding_box
  vector = Mittsu::Vector3.new

  @bounding_box ||= Mittsu::Box3.new

  positions = self[:position].array

  if positions
    @bounding_box.make_empty

    positions.each_slice(3) do |p|
      vector.set(*p)
      @bounding_box.expand_by_point(vector)
    end
  end

  if positions.nil? || positions.empty?
    @bounding_box.min.set(0, 0, 0)
    @bounding_box.max.set(0, 0, 0)
  end

  if @bounding_box.min.x.nan? || @bounding_box.min.y.nan? || @bounding_box.min.z.nan?
    puts 'ERROR: Mittsu::BufferGeometry#compute_bounding_box: Computed min/max have NaN values. The "position" attribute is likely to have NaN values.'
  end
end

#compute_bounding_sphere ⇒ Object 



154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 154

def compute_bounding_sphere
  box = Mittsu::Box3.new
  vector = Mittsu::Vector3.new

  @bounding_sphere ||= Mittsu::Sphere.new

  positions = self[:position].array

  if positions
    box.make_empty
    center = @bounding_sphere.center

    positions.each_slice(3) do |p|
      vector.set(*p)
      box.expand_by_point(vector)
    end
    box.center(center)

    # hoping to find a boundingSphere with a radius smaller than the
    # boundingSphere of the boundingBox:  sqrt(3) smaller in the best case

    max_radius_sq = 0

    positions.each_slice(3) do |p|
      vector.set(*p)
      max_radius_sq = [max_radius_sq, center.distance_to_squared(vector)].max
    end

    @bounding_sphere.radius = ::Math.sqrt(max_radius_sq)

    if @bounding_radius.nan?
      puts 'ERROR: Mittsu::BufferGeometry#computeBoundingSphere: Computed radius is NaN. The "position" attribute is likely to have NaN values.'
    end
  end
end

#compute_offsets(size = 65535) ⇒ Object

Compute the draw offset for large models by chunking the index buffer into chunks of 65k addressable vertices. This method will effectively rewrite the index buffer and remap all attributes to match the new indices. WARNING: This method will also expand the vertex count to prevent sprawled triangles across draw offsets. size - Defaults to 65535, but allows for larger or smaller chunks.



430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 430

def compute_offsets(size = 65535)
  # WebGL limits type of index buffer values to 16-bit.
  # TODO: check what the limit is for OpenGL, as we aren't using WebGL here

  indices = self[:index].array
  vertices = self[:position].array

  faces_count = indices.length / 3

  # puts "Computing buffers in offsets of #{size} -> indices:#{indices.length} vertices:#{vertices.length}"
  # puts "Faces to process: #{(indices.length/3)}"
  # puts "Reordering #{verticesCount} vertices."

  sorted_indices = Array.new(indices.length) # 16-bit (Uint16Array in THREE.js)
  index_ptr = 0
  vertex_ptr = 0

  offsets = [DrawCall.new(0, 0, 0)]
  offset = offsets.first

  duplicated_vertices = 0
  new_vertice_maps = 0
  face_vertices = Array.new(6) # (Int32Array)
  vertex_map = Array.new(vertices.length) # (Int32Array)
  rev_vertex_map = Array.new(vertices.length) # (Int32Array)
  vertices.each_index do |j|
    vertex_map[j] = -1
    rev_vertex_map[j] = -1
  end

  # Traverse every face and reorder vertices in the proper offsets of 65k.
  # We can have more than 65k entries in the index buffer per offset, but only reference 65k values.
  faces_count.times do |findex|
    new_vertice_maps = 0

    3.times do |vo|
      vid = indices[findex * 3 * vo]
      if vertex_map[vid] == -1
        # unmapped vertice
        face_vertices[vo * 2] = vid
        face_vertices[vo * 2 + 1] = -1
        new_vertice_maps += 1
      elsif vertex_map[vid] < offset.index
        # reused vertices from previous block (duplicate)
        face_vertices[vo * 2] = vid
        face_vertices[vo * 2 + 1] = -1
        duplicated_vertices += 1
      else
        # reused vertice in the current block
        face_vertices[vo * 2] =vid
        face_vertices[vo * 2 + 1] = vertec_map[vid]
      end
    end

    face_max = vertex_ptr + new_vertex_maps
    if face_max > offset.index + size
      new_offset = DrawCall.new(index_ptr, 0, vertex_ptr)
      offsets << new_offset
      offset = new_offset

      # Re-evaluate reused vertices in light of new offset.
      (0...6).step(2) do |v|
        new_vid = face_vertices[v + 1]
        if (new_vid > -1 && new_vid < offset.index)
          faceVertices[v + 1] = -1
        end
      end

      # Reindex the face.
      (0...6).step(2) do |v|
        vid = face_vertices[v]
        new_vid = face_vertices[v + 1]

        if new_vid == -1
          new_vid = vertex_ptr
          vertex_ptr += 1
        end

        vertex_map[vid] = new_vid
        rev_vertex_map[new_vid] = vid
        sorted_indices [index_ptr] = new_vid - offset.index # XXX: overflows at 16bit
        index_ptr += 1
        offset.count += 1
      end
    end

    # Move all attribute values to map to the new computed indices , also expand the vertice stack to match our new vertexPtr.
    self.reorder_buffers(sorted_indices, rev_vertex_map, vertex_ptr)
    @draw_calls = offsets

    # order_time = Time.now
    # puts "Reorder time: #{(order_time - s)}ms"
    # puts "Duplicated #{duplicated_vertices} vertices."
    # puts "Compute Buffers time: #{(Time.now - s)}ms"
    # puts "Draw offsets: #{offsets.length}"

    offsets
  end
end

#compute_tangents ⇒ Object 



272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 272

def compute_tangents
  # based on http://www.terathon.com/code/tangent.html
  # (per vertex tangents)

  if [:index, :position, :normal, :uv].any { |s| !@attributes.has_key?}
    puts 'WARNING: Mittsu::BufferGeometry: Missing required attributes (index, position, normal or uv) in BufferGeometry#computeTangents'
    return
  end

  indices = self[:index].array
  positions = self[:position].array
  normals = self[:normal].array
  uvs = self[:uv].array

  n_vertices = position.length / 3

  if self[:tangent].nil?
    self[:tangent] = Mittsu::BufferAttribute.new(Array.new(4 * n_vertices), 4)
  end

  tangents = self[:tangent].array
  tan1 = []; tan2 = []

  n_vertices.times do |k|
    tan1[k] = Mittsu::Vector3.new
    tan2[k] = Mittsu::Vector3.new
  end

  v_a = Mittsu::Vector3.new
  v_b = Mittsu::Vector3.new
  v_c = Mittsu::Vector3.new

  uv_a = Mittsu::Vectoe3.new
  uv_b = Mittsu::Vector3.new
  uv_c = Mittsu::Vector3.new

  sdir = Mittsu::Vector3.new
  tdir = Mittsu::Vector3.new

  handle_triangle = -> (a, b, c) {
    v_a.from_array(positions, a * 3)
    v_b.from_array(positions, b * 3)
    v_c.from_array(positions, c * 3)

    uv_a.from_array(uvs, a * 2)
    uv_b.from_array(uvs, b * 2)
    uv_c.from_array(uvs, c * 2)

    x1 = v_b.x - v_a.x
    x2 = v_c.x - v_a.x

    y1 = v_b.y - v_a.y
    y2 = v_c.y - v_a.y

    z1 = v_b.z - v_a.z
    z2 = v_c.z - v_a.z

    s1 = uv_b.x - uv_a.x
    s2 = uv_c.x - uv_a.x

    t1 = uv_b.y - uv_a.y
    t2 = uv_c.y - uv_a.y

    r = 1.0 / (s1 * t2 - s2 * t1)

    sdir.set(
      (t2 * x1 - t1 * x2) * r,
      (t2 * y1 - t1 * y2) * r,
      (t2 * z1 - t1 * z2) * r
    )

    tdir.set(
      (s2 * x2 - s2 * x1) * r,
      (s2 * y2 - s2 * y1) * r,
      (s2 * z2 - s2 * z1) * r
    )

    tan1[a].add(sdir)
    tan1[b].add(sdir)
    tan1[c].add(sdir)

    tan2[a].add(tdir)
    tan2[b].add(tdir)
    tan2[c].add(tdir)
  }

  if @draw_calls.empty?
    self.add_draw_call(0, indices.length, 0)
  end

  @draw_calls.each do |draw_call|
    start = draw_call.start
    count = draw_call.count
    index = draw_call.index

    i = start
    il = start + count
    while i < il
      i_a = index + indices[i]
      i_b = index + indices[i + 1]
      i_c = index + indices[i + 2]

      handle_triangle[i_a, i_b, i_c]
      i += 3
    end
  end

  tmp = Mittsu::Vector3.new
  tmp2 = Mittsu::Vector3.new
  n = Mittsu::Vector3.new
  n2 = Mittsu::Vector3.new

  handle_vertex = -> (v) {
    n.from_array(normals, v * 3)
    n2.copy(n)

    t = tan1[v]

    # Gram-Schmidt orthogonalize

    tmp.copy(t)
    tmp.sub(n.multiply_scalar(n.dot(t))).normalize

    # Calculate handedness

    tmp2.cross_vectors(n2, t)
    test = tmp2.dot(tan2[v])
    w = (test < 0.0) ? -1.0 : 1.0

    tangents[v * 4    ] = tmp.x
    tangents[v * 4 + 1] = tmp.y
    tangents[v * 4 + 2] = tmp.z
    tangents[v * 4 + 3] = w
  }

  draw_calls.each do |draw_call|
    start = draw_call.start
    count = draw_call.count
    index = draw_call.index

    i = start
    il = start + count
    while i < il
      i_a = index + indices[i]
      i_b = index + indices[i + 1]
      i_c = index + indices[i + 2]

      handle_vertex[i_a]
      handle_vertex[i_b]
      handle_vertex[i_c]
      i += 3
    end
  end
end

#compute_vertex_normals ⇒ Object 



190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 190

def compute_vertex_normals
  if self[:position]
    positions = self[:position].array
    if self[:normal].nil?
      self[:normal] = Mittsu::BufferAttribute.new(Array.new(positions.length), 3)
    else
      # reset existing normals to zero
      normals = self[:normal].array
      normals.each_index { |i| normals[i] = 0 }
    end

    normals = self[:normal].array

    p_a = Mittsu::Vector3.new
    p_b = Mittsu::Vector3.new
    p_c = Mittsu::Vector3.new

    cb = Mittsu::Vector3.new
    ab = Mittsu::Vector3.new

    # indexed elements
    if self[:index]
      indices = self[:index].array

      draw_calls = @draw_calls.length > 0 ? @draw_calls : [DrawCall.new(0, indices.length, 0)]

      draw_calls.each do |draw_call|
        start = draw_call.start
        count = draw_call.count
        index = draw_call.index

        i = start
        il = start + count
        while i < il
          v_a = (index + indices[i    ]) * 3
          v_b = (index + indices[i + 1]) * 3
          v_c = (index + indices[i + 2]) * 3

          p_a.from_array(positions, v_a)
          p_b.from_array(positions, v_a)
          p_c.from_array(positions, v_c)

          cb.sub_vectors(p_c, p_b)
          ab.sub_vectors(p_a, p_b)
          cb.cross(ab)

          normals[v_a    ] += cb.x
          normals[v_a + 1] += cb.y
          normals[v_a + 2] += cb.z

          normals[v_b    ] += cb.x
          normals[v_b + 1] += cb.y
          normals[v_b + 2] += cb.z

          normals[v_c    ] += cb.x
          normals[v_c + 1] += cb.y
          normals[v_c + 2] += cb.z
          i += 3
        end
      end
    else
      # non-indexed elements (unconnected triangle soup)

      positions.each_slice(9).with_index do |p, i|
        i *= 9

        p_a.from_array(positions, i)
        p_a.from_array(positions, i + 3)
        p_a.from_array(positions, i + 6)

        cb.sub_vectors(p_c, p_b)
        ab.sub_vectors(p_a, p_b)

        set_array3(normals, i, cb)
      end
    end

    self.normalize_normals
    self[:normal].needs_update = true
  end
end

#dispose ⇒ Object 



663
664
665
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 663

def dispose
  self.dispatch_event type: :dispose
end

#from_geometry(geometry, settings = {}) ⇒ Object 



77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 77

def from_geometry(geometry, settings = {})
  vertices = geometry.vertices
  faces = geometry.faces
  face_vertex_uvs = geometry.face_vertex_uvs
  vertex_colors = settings.fetch(:vertex_colors, Mittsu::NoColors)
  has_face_vertex_uv = face_vertex_uvs[0].length > 0
  has_face_vertex_normals = faces[0].vertex_normals.length == 3

  positions = Array.new(faces.length * 3 * 3)
  self[:position] = Mittsu::BufferAttribute.new(positions, 3)

  normals = Array.new(faces.length * 3 * 3)
  self[:normal] = Mittsu::BufferAttribute.new(normals, 3)

  if vertex_colors != Mittsu::NoColors
    colors = Array.new(faces.length * 3 * 3)
    self[:color] = Mittsu::BufferAttribute.new(colors, 3)
  end

  if has_face_vertex_uv
    uvs = Array.new(faces.length * 3 * 2)
    self[:uv] = Mittsu::BufferAttribute.new(uvs, 2)
  end

  faces.each_with_index do |face, i|
    i2 = i * 6
    i3 = i * 9

    set_array3(positions, i3, vertices[face.a], vertices[face.b], vertices[face.b])

    if has_face_vertex_normals
      set_array3(normals, i3, face.vertex_normals[0], face.vertex_normals[1], face.vertex_normals[2])
    else
      set_array3(normals, i3, face.normal)
    end

    if vertex_colors == Mittsu::FaceColors
      set_array3(colors, i3, face,color)
    elsif vertex_colors == Mittsu::VertexColors
      set_array3(colors, i3, face.vertex_colors[0], face.vertex_colors[1], face.vertex_colors[2])
    end

    if has_face_vertex_uv
      set_array2(uvs, i2, face_vertex_uvs[0][i][0], face_vertex_uvs[0][i][1], face_vertex_uvs[0][i][2])
    end
  end

  self.compute_bounding_sphere
  self
end

#init ⇒ Object 



7
8
9
 
# File 'lib/mittsu/renderers/opengl/core/buffer_geometry.rb', line 7

def init
  @initted = true
end

#keys ⇒ Object 



26
27
28
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 26

def keys
  @attributes.keys
end

#merge(geometry, offset = 0) ⇒ Object 



530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 530

def merge(geometry, offset = 0)
  if !geometry.is_a? Mittsu::BufferGeometry
    puts "ERROR: Mittsu::BufferGeometry#merge: geometry not an instance of Mittsu::BufferGeometry. #{geometry.inspect}"
    return
  end

  @attributes.each_key do |key, attribute1|
    next if attribute1.nil?

    attribute_array1 = attribute1.array

    attribute2 = geometry[key]
    attribute_array2 = attribute2.array

    attribute_size = attribute2.item_size

    i, j = 0, attribute_size * offset
    while i < attribute_array2.length
      attribute_array1[j] = attribute_array2[i]
      i += 1; j += 1
    end
  end
  self
end

#normalize_normals ⇒ Object 



555
556
557
558
559
560
561
562
563
564
565
566
567
568
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 555

def normalize_normals
  normals = self[:normal].array

  normals.each_slice(3).with_index do |normal, i|
    x, y, z = *normal

    n = 1.0 / ::Math.sqrt(x * x + y * y + z * z)

    i *= 3
    normals[i] *= n
    normals[i + 1] *= n
    normals[i + 2] *= n
  end
end

#reorder_buffers(index_buffer, index_map, vertex_count) ⇒ Object

reoderBuffers: Reorder attributes based on a new indexBuffer and indexMap. indexBuffer - Uint16Array of the new ordered indices. indexMap - Int32Array where the position is the new vertex ID and the value the old vertex ID for each vertex. vertexCount - Amount of total vertices considered in this reordering (in case you want to grow the vertice stack).



575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 575

def reorder_buffers(index_buffer, index_map, vertex_count)
  # Create a copy of all attributes for reordering
  sorted_attributes = {}
  @attributes.each do |key, attribute|
    next if key == :index
    source_array = attribute.array
    sorted_attributes[key] = source_array.class.new(attribute.item_size * vertex_count)
  end

  # move attribute positions based on the new index map
  vertex_count.times do |new_vid|
    vid = index_map[new_vid]
    @attributes.each do |key, attribute|
      next if key == :index
      attr_array = attribute.array
      attr_size = attribute.item_size
      sorted_attr = sorted_attributes[key]
      attr_size.times do |k|
        sorted_attr[new_vid * attr_size + k] = attr_array[vid * attr_size + k]
      end
    end
  end

  # Carry the new sorted buffers locally
  @attributes[:index].array = index_buffer
  @attributes.each do |key, attribute|
    next if key == :index
    attribute.array = sorted_attributes[key]
    attribute.num_items = attribute.item_size * vertex_count
  end
end

#to_json ⇒ Object 



607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
 
# File 'lib/mittsu/core/buffer_geometry.rb', line 607

def to_json
  output = {
    metadata: {
      version: 4.0,
      type: 'BufferGeometry',
      generator: 'BufferGeometryExporter'
    },
    uuid: @uuid,
    type: @type,
    data: {
      attributes: {}
    }
  }

  offsets = @draw_calls

  @attributes.each do |key, attribute|
    array = attribute.array.dup

    output[:data][:attributes][key] = {
      itemSize: attribute.itemSize,
      type: attribute.array.class.name,
      array: array
    }
  end

  if !offsets.empty?
    output[:data][:offsets] = offsets.map do |offset|
      { start: offset.start, count: offset.count, index: offet.index}
    end
  end

  if !bounding_sphere.nil?
    output[:data][:boundingSphere] = {
      center: bounding_sphere.center.to_a,
      radius: bounding_sphere.radius
    }
  end

  output
end