blender/io_mspgl/mesh.py

   1 import bpy
   2 import math
   3 import mathutils
   4
   5 def make_edge_key(i1, i2):
   6         return (min(i1, i2), max(i1, i2))
   7
   8 class Edge:
   9         def __init__(self, me):
  10                 if me.__class__==Edge:
  11                         self._medge = me._medge
  12                         self.vertices = me.vertices[:]
  13                         self.smooth = me.smooth
  14                 else:
  15                         self._medge = me
  16                         self.smooth = False
  17                 self.key = me.key
  18                 self.faces = []
  19
  20         def __getattr__(self, attr):
  21                 return getattr(self._medge, attr)
  22
  23         def check_smooth(self, limit):
  24                 if len(self.faces)!=2:
  25                         return
  26
  27                 d = self.faces[0].normal.dot(self.faces[1].normal)
  28                 self.smooth = ((d>limit and self.faces[0].use_smooth and self.faces[1].use_smooth) or d>0.99995)
  29
  30         def other_face(self, f):
  31                 if f.index==self.faces[0].index:
  32                         if len(self.faces)>=2:
  33                                 return self.faces[1]
  34                         else:
  35                                 return None
  36                 else:
  37                         return self.faces[0]
  38
  39         def other_vertex(self, v):
  40                 if v.index==self.vertices[0].index:
  41                         return self.vertices[1]
  42                 else:
  43                         return self.vertices[0]
  44
  45
  46 class Vertex:
  47         def __init__(self, mv):
  48                 if mv.__class__==Vertex:
  49                         self._mvert = mv._mvert
  50                         self.uvs = mv.uvs[:]
  51                         self.tan = mv.tan
  52                         self.bino = mv.bino
  53                 else:
  54                         self._mvert = mv
  55                         self.uvs = []
  56                         self.tan = None
  57                         self.bino = None
  58                 self.index = mv.index
  59                 self.co = mv.co
  60                 self.normal = mv.normal
  61                 self.flag = False
  62                 self.edges = []
  63                 self.faces = []
  64                 self.groups = mv.groups[:]
  65
  66         def __getattr__(self, attr):
  67                 return getattr(self._mvert, attr)
  68
  69         def __cmp__(self, other):
  70                 if other is None:
  71                         return 1
  72                 return cmp(self.index, other.index)
  73
  74
  75 class VertexGroup:
  76         def __init__(self, base):
  77                 self._base = base
  78                 self.group = base.group
  79                 self.weight = base.weight
  80
  81         def __getattr__(self, attr):
  82                 return getattr(self._mvert, attr)
  83
  84
  85 class Face:
  86         def __init__(self, mf):
  87                 self._mface = mf
  88                 self.index = mf.index
  89                 self.edges = []
  90                 self.vertices = mf.vertices[:]
  91                 self.uvs = []
  92                 self.flag = False
  93
  94         def __getattr__(self, attr):
  95                 return getattr(self._mface, attr)
  96
  97         def __cmp__(self, other):
  98                 if other is None:
  99                         return 1
 100                 return cmp(self.index, other.index)
 101
 102         def pivot_vertex(self, v):
 103                 n = self.vertices.index(v)
 104                 return [(n+i)%len(self.vertices) for i in range(len(self.vertices))]
 105
 106         def pivot_vertices(self, *vt):
 107                 flags = [(v in vt) for v in self.vertices]
 108                 l = len(self.vertices)
 109                 for i in range(l):
 110                         if flags[i] and not flags[(i+l-1)%l]:
 111                                 return self.vertices[i:]+self.vertices[:i]
 112
 113         def get_edge(self, v1, v2):
 114                 key = make_edge_key(v1.index, v2.index)
 115                 for e in self.edges:
 116                         if e.key==key:
 117                                 return e
 118                 raise KeyError("No edge %s"%(key,))
 119
 120         def other_edge(self, e, v):
 121                 for d in self.edges:
 122                         if d!=e and v in d.vertices:
 123                                 return d
 124
 125         def get_neighbors(self):
 126                 neighbors = [e.other_face(self) for e in self.edges]
 127                 return list(filter(bool, neighbors))
 128
 129
 130 class Line:
 131         def __init__(self, e):
 132                 self.edge = e
 133                 self.vertices = e.vertices[:]
 134                 self.flag = False
 135
 136
 137 class UvLayer:
 138         def __init__(self, arg):
 139                 if type(arg)==str:
 140                         self._layer = None
 141                         self.name = arg
 142                 else:
 143                         self._layer = arg
 144                         self.name = arg.name
 145                         self.uvs = [d.uv for d in self.data]
 146
 147                 self.unit = None
 148                 self.hidden = False
 149
 150                 dot = self.name.find('.')
 151                 if dot>=0:
 152                         ext = self.name[dot:]
 153                         if ext.startswith(".unit") and ext[5:].isdigit():
 154                                 self.unit = int(ext[5:])
 155                         elif ext==".hidden":
 156                                 self.hidden = True
 157
 158         def __getattr__(self, attr):
 159                 return getattr(self._layer, attr)
 160
 161
 162 class Mesh:
 163         def __init__(self, m):
 164                 self._mesh = m
 165
 166                 self.winding_test = m.winding_test
 167                 self.tbn_vecs = m.tbn_vecs
 168                 self.vertex_groups = m.vertex_groups
 169
 170                 self.vertices = [Vertex(v) for v in self.vertices]
 171                 self.faces = [Face(f) for f in self.polygons]
 172                 self.edges = [Edge(e) for e in self.edges]
 173                 self.edge_map = {e.key: e for e in self.edges}
 174                 self.loops = self.loops[:]
 175
 176                 self.materials = self.materials[:]
 177                 if self.use_uv=='NONE' or not self.uv_layers:
 178                         self.uv_layers = []
 179                 else:
 180                         self.uv_layers = [UvLayer(u) for u in self.uv_layers]
 181                         self.uv_layers = sorted([u for u in self.uv_layers if not u.hidden], key=(lambda u: (u.unit or 1000, u.name)))
 182
 183                         if self.use_uv=='UNIT0':
 184                                 self.uv_layers = [self.uv_layers[0]]
 185
 186                         next_unit = max((u.unit+1 for u in self.uv_layers if u.unit is not None), default=0)
 187                         for u in self.uv_layers:
 188                                 if not u.unit:
 189                                         u.unit = next_unit
 190                                         next_unit += 1
 191
 192                 for v in self.vertices:
 193                         v.groups = [VertexGroup(g) for g in v.groups]
 194
 195                 for f in self.faces:
 196                         if len(f.vertices)>4:
 197                                 raise ValueError("Ngons are not supported")
 198
 199                         f.vertices = [self.vertices[i] for i in f.vertices]
 200                         for v in f.vertices:
 201                                 v.faces.append(f)
 202
 203                         for k in f.edge_keys:
 204                                 e = self.edge_map[k]
 205                                 e.faces.append(f)
 206                                 f.edges.append(e)
 207
 208                 for e in self.edges:
 209                         e.vertices = [self.vertices[i] for i in e.vertices]
 210                         for v in e.vertices:
 211                                 v.edges.append(e)
 212
 213                 if self.use_lines:
 214                         self.lines = [Line(e) for e in self.edges if not e.faces]
 215                 else:
 216                         self.lines = []
 217
 218         def __getattr__(self, attr):
 219                 return getattr(self._mesh, attr)
 220
 221         def transform(self, matrix):
 222                 for v in self.vertices:
 223                         v.co = matrix*v.co
 224
 225         def splice(self, other):
 226                 if len(self.uv_layers)!=len(other.uv_layers):
 227                         raise ValueError("Meshes have incompatible UV layers")
 228                 for i, u in enumerate(self.uv_layers):
 229                         if u.name!=other.uv_layers[i].name:
 230                                 raise ValueError("Meshes have incompatible UV layers")
 231
 232                 material_map = []
 233                 for m in other.materials:
 234                         if m in self.materials:
 235                                 material_map.append(self.materials.index(m))
 236                         else:
 237                                 material_map.append(len(self.materials))
 238                                 self.materials.append(m)
 239
 240                 for i, u in enumerate(self.uv_layers):
 241                         u.uvs += other.uv_layers[i].uvs
 242
 243                 offset = len(self.vertices)
 244                 self.vertices += other.vertices
 245                 for v in self.vertices[offset:]:
 246                         v.index += offset
 247
 248                 loop_offset = len(self.loops)
 249                 self.loops += other.loops
 250
 251                 offset = len(self.faces)
 252                 self.faces += other.faces
 253                 for f in self.faces[offset:]:
 254                         f.index += offset
 255                         f.loop_start += loop_offset
 256                         f.loop_indices = range(f.loop_start, f.loop_start+f.loop_total)
 257                         if other.materials:
 258                                 f.material_index = material_map[f.material_index]
 259
 260                 offset = len(self.edges)
 261                 self.edges += other.edges
 262                 for e in self.edges[offset:]:
 263                         e.index += offset
 264                         e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 265                         self.edge_map[e.key] = e
 266
 267                 self.lines += other.lines
 268
 269         def prepare_smoothing(self, progress):
 270                 smooth_limit = -1
 271                 if self.smoothing=='NONE':
 272                         for f in self.faces:
 273                                 f.use_smooth = False
 274
 275                         smooth_limit = 1
 276                 elif self.use_auto_smooth:
 277                         smooth_limit = math.cos(self.auto_smooth_angle)
 278
 279                 for e in self.edges:
 280                         e.check_smooth(smooth_limit)
 281
 282                 progress.push_task("Sharp edges", 0.0, 0.7)
 283                 self.split_vertices(self.find_smooth_group, progress)
 284
 285                 if self.smoothing!='BLENDER':
 286                         progress.set_task("Updating normals", 0.7, 1.0)
 287                         self.compute_normals(progress)
 288
 289                 progress.pop_task()
 290
 291         def prepare_vertex_groups(self, obj):
 292                 for v in self.vertices:
 293                         if v.groups:
 294                                 weight_sum = sum(g.weight for g in v.groups)
 295                                 v.groups = sorted(v.groups, key=(lambda g: g.weight), reverse=True)[:self.max_groups_per_vertex]
 296                                 weight_scale = weight_sum/sum(g.weight for g in v.groups)
 297                                 for g in v.groups:
 298                                         g.weight *= weight_scale
 299
 300                 if obj.parent and obj.parent.type=="ARMATURE":
 301                         armature = obj.parent.data
 302                         bone_indices = {b.name: i for i, b in enumerate(armature.bones)}
 303                         group_index_map = {i: i for i in range(len(obj.vertex_groups))}
 304                         for g in first_obj.vertex_groups:
 305                                 if g.name in bone_indices:
 306                                         group_index_map[g.index] = bone_indices[g.name]
 307
 308                         for v in self.vertices:
 309                                 for g in v.groups:
 310                                         g.group = group_index_map[g.group]
 311
 312         def prepare_uv(self, obj, progress):
 313                 if obj.material_tex and self.use_uv!='NONE':
 314                         layer = UvLayer("material_tex")
 315
 316                         if self.use_uv=='UNIT0':
 317                                 self.uv_layers = [layer]
 318                                 layer.unit = 0
 319                         else:
 320                                 self.uv_layers.append(layer)
 321                                 layer.unit = max((u.unit+1 for u in self.uv_layers if u.unit is not None), default=0)
 322
 323                         layer.uvs = [None]*len(self.loops)
 324                         for f in self.faces:
 325                                 uv = mathutils.Vector(((f.material_index+0.5)/len(self.materials), 0.5))
 326                                 for i in f.loop_indices:
 327                                         layer.uvs[i] = uv
 328
 329                 array_uv_layers = [t.uv_layer for m in self.materials if m.array_atlas for t in m.texture_slots if t and t.texture_coords=='UV']
 330                 array_uv_layers = [u for u in self.uv_layers if u.name in array_uv_layers]
 331
 332                 if array_uv_layers:
 333                         for f in self.faces:
 334                                 layer = 0
 335                                 if f.material_index<len(self.materials):
 336                                         mat = self.materials[f.material_index]
 337                                         if mat and mat.array_atlas:
 338                                                 layer = mat.array_layer
 339
 340                                 for l in array_uv_layers:
 341                                         for i in f.loop_indices:
 342                                                 l.uvs[i] = mathutils.Vector((*l.uvs[i], layer))
 343
 344                 for f in self.faces:
 345                         for u in self.uv_layers:
 346                                 f.uvs.append([u.uvs[i] for i in f.loop_indices])
 347
 348                 prog_count = len(self.uv_layers)
 349                 prog_step = 0
 350
 351                 tbn_layer_index = -1
 352                 if self.tbn_vecs:
 353                         uv_names = [u.name for u in self.uv_layers]
 354                         if self.tbn_uvtex in uv_names:
 355                                 prog_count += 1
 356                                 tbn_layer_index = uv_names.index(self.tbn_uvtex)
 357                                 progress.push_task_slice("Computing TBN", 0, prog_count)
 358                                 self.split_vertices(self.find_uv_group, progress, tbn_layer_index)
 359                                 progress.set_task_slice(self.tbn_uvtex, 1, prog_count)
 360                                 self.compute_tbn(tbn_layer_index, progress)
 361                                 progress.pop_task()
 362                                 prog_step = 2
 363
 364                 for i, u in enumerate(self.uv_layers):
 365                         if i==tbn_layer_index:
 366                                 continue
 367
 368                         progress.push_task_slice(u.name, prog_step, prog_count)
 369                         self.split_vertices(self.find_uv_group, progress, i)
 370                         progress.pop_task()
 371                         prog_step += 1
 372
 373                 for v in self.vertices:
 374                         if v.faces:
 375                                 f = v.faces[0]
 376                                 i = f.vertices.index(v)
 377                                 v.uvs = [u[i] for u in f.uvs]
 378                         else:
 379                                 v.uvs = [(0.0, 0.0)]*len(self.uv_layers)
 380
 381         def split_vertices(self, find_group_func, progress, *args):
 382                 groups = []
 383                 for i in range(len(self.vertices)):
 384                         v = self.vertices[i]
 385                         for f in v.faces:
 386                                 f.flag = False
 387
 388                         vg = []
 389                         for f in v.faces:
 390                                 if not f.flag:
 391                                         vg.append(find_group_func(v, f, *args))
 392
 393                         groups.append(vg)
 394
 395                         progress.set_progress(i*0.5/len(self.vertices))
 396
 397                 for i in range(len(self.vertices)):
 398                         for g in groups[i][1:]:
 399                                 v = Vertex(self.vertices[i])
 400                                 v.index = len(self.vertices)
 401                                 self.vertices.append(v)
 402
 403                                 v_edges = []
 404                                 for e in self.vertices[i].edges:
 405                                         e_faces_in_g = [f for f in e.faces if f in g]
 406                                         if e_faces_in_g:
 407                                                 boundary = len(e_faces_in_g)<len(e.faces)
 408                                                 v_edges.append((e, boundary, e_faces_in_g))
 409
 410                                 for e, boundary, e_faces_in_g in v_edges:
 411                                         if boundary:
 412                                                 ne = Edge(e)
 413                                                 ne.index = len(self.edges)
 414                                                 self.edges.append(ne)
 415
 416                                                 ne.other_vertex(self.vertices[i]).edges.append(ne)
 417
 418                                                 for f in e_faces_in_g:
 419                                                         e.faces.remove(f)
 420                                                         f.edges[f.edges.index(e)] = ne
 421                                                         ne.faces.append(f)
 422                                                 e = ne
 423                                         else:
 424                                                 del self.edge_map[e.key]
 425                                                 self.vertices[i].edges.remove(e)
 426
 427                                         e.vertices[e.vertices.index(self.vertices[i])] = v
 428                                         v.edges.append(e)
 429
 430                                         e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 431                                         self.edge_map[e.key] = e
 432
 433                                 for f in g:
 434                                         self.vertices[i].faces.remove(f)
 435                                         f.vertices[f.vertices.index(self.vertices[i])] = v
 436                                         v.faces.append(f)
 437
 438                         progress.set_progress(0.5+i*0.5/len(self.vertices))
 439
 440         def find_smooth_group(self, vertex, face):
 441                 face.flag = True
 442
 443                 edges = [e for e in face.edges if vertex in e.vertices]
 444
 445                 group = [face]
 446                 for e in edges:
 447                         f = face
 448                         while e.smooth:
 449                                 f = e.other_face(f)
 450                                 if not f or f.flag:
 451                                         break
 452
 453                                 f.flag = True
 454                                 group.append(f)
 455                                 e = f.other_edge(e, vertex)
 456
 457                 return group
 458
 459         def find_uv_group(self, vertex, face, index):
 460                 uv = face.uvs[index][face.vertices.index(vertex)]
 461                 face.flag = True
 462
 463                 group = [face]
 464                 for f in vertex.faces:
 465                         if not f.flag and f.uvs[index][f.vertices.index(vertex)]==uv:
 466                                 f.flag = True
 467                                 group.append(f)
 468
 469                 return group
 470
 471         def compute_normals(self, progress):
 472                 for i, v in enumerate(self.vertices):
 473                         v.normal = mathutils.Vector()
 474                         for f in v.faces:
 475                                 fv = f.pivot_vertices(v)
 476                                 edge1 = fv[1].co-fv[0].co
 477                                 edge2 = fv[-1].co-fv[0].co
 478                                 if edge1.length and edge2.length:
 479                                         v.normal += f.normal*edge1.angle(edge2)
 480
 481                         if v.normal.length:
 482                                 v.normal.normalize()
 483                         else:
 484                                 v.normal = mathutils.Vector((0, 0, 1))
 485
 486                         progress.set_progress(i/len(self.vertices))
 487
 488         def compute_tbn(self, index, progress):
 489                 layer_uvs = self.uv_layers[index].uvs
 490
 491                 for i, v in enumerate(self.vertices):
 492                         v.tan = mathutils.Vector()
 493                         v.bino = mathutils.Vector()
 494                         for f in v.faces:
 495                                 vi = f.pivot_vertex(v)
 496                                 uv0 = layer_uvs[f.loop_indices[vi[0]]]
 497                                 uv1 = layer_uvs[f.loop_indices[vi[1]]]
 498                                 uv2 = layer_uvs[f.loop_indices[vi[-1]]]
 499                                 du1 = uv1[0]-uv0[0]
 500                                 du2 = uv2[0]-uv0[0]
 501                                 dv1 = uv1[1]-uv0[1]
 502                                 dv2 = uv2[1]-uv0[1]
 503                                 edge1 = f.vertices[vi[1]].co-f.vertices[vi[0]].co
 504                                 edge2 = f.vertices[vi[-1]].co-f.vertices[vi[0]].co
 505                                 div = (du1*dv2-du2*dv1)
 506                                 if div:
 507                                         mul = edge1.angle(edge2)/div
 508                                         v.tan += (edge1*dv2-edge2*dv1)*mul
 509                                         v.bino += (edge2*du1-edge1*du2)*mul
 510
 511                         if v.tan.length:
 512                                 v.tan.normalize()
 513                         if v.bino.length:
 514                                 v.bino.normalize()
 515
 516                         progress.set_progress(i/len(self.vertices))
 517
 518         def drop_references(self):
 519                 for v in self.vertices:
 520                         v._mvert = None
 521                         for g in v.groups:
 522                                 g._base = None
 523                 for e in self.edges:
 524                         e._medge = None
 525                 for f in self.faces:
 526                         f._mface = None
 527                 for u in self.uv_layers:
 528                         u._layer = None
 529                 self._mesh = None
 530
 531         def create_strip(self, face, max_len):
 532                 # Find an edge with another unused face next to it
 533                 edge = None
 534                 for e in face.edges:
 535                         other = e.other_face(face)
 536                         if other and not other.flag:
 537                                 edge = e
 538                                 break
 539
 540                 if not edge:
 541                         return None
 542
 543                 # Add initial vertices so that we'll complete the edge on the first
 544                 # iteration
 545                 vertices = face.pivot_vertices(*edge.vertices)
 546                 if len(vertices)==3:
 547                         result = [vertices[-1], vertices[0]]
 548                 else:
 549                         result = [vertices[-2], vertices[-1]]
 550
 551                 while 1:
 552                         face.flag = True
 553
 554                         vertices = face.pivot_vertices(*result[-2:])
 555                         k = len(result)%2
 556
 557                         # Quads need special handling because the winding of every other
 558                         # triangle in the strip is reversed
 559                         if len(vertices)==4 and not k:
 560                                 result.append(vertices[3])
 561                         result.append(vertices[2])
 562                         if len(vertices)==4 and k:
 563                                 result.append(vertices[3])
 564
 565                         if len(result)>=max_len:
 566                                 break
 567
 568                         # Hop over the last edge
 569                         edge = face.get_edge(*result[-2:])
 570                         face = edge.other_face(face)
 571                         if not face or face.flag:
 572                                 break
 573
 574                 return result
 575
 576 def create_mesh_from_object(context, obj, progress):
 577         if obj.type!="MESH":
 578                 raise Exception("Object is not a mesh")
 579
 580         progress.push_task("Preparing mesh", 0.0, 0.3)
 581
 582         objs = [(obj, mathutils.Matrix())]
 583         i = 0
 584         while i<len(objs):
 585                 o, m = objs[i]
 586                 i += 1
 587                 for c in o.children:
 588                         if c.type=="MESH" and c.compound:
 589                                 objs.append((c, m*c.matrix_local))
 590
 591         mesh = None
 592         bmeshes = []
 593         for o, m in objs:
 594                 bmesh = o.to_mesh(context.scene, True, "PREVIEW")
 595                 bmeshes.append(bmesh)
 596
 597                 # Object.to_mesh does not copy custom properties
 598                 bmesh.winding_test = o.data.winding_test
 599                 bmesh.smoothing = o.data.smoothing
 600                 bmesh.use_lines = o.data.use_lines
 601                 bmesh.vertex_groups = o.data.vertex_groups
 602                 bmesh.max_groups_per_vertex = o.data.max_groups_per_vertex
 603                 bmesh.use_uv = o.data.use_uv
 604                 bmesh.tbn_vecs = o.data.tbn_vecs
 605                 bmesh.tbn_uvtex = o.data.tbn_uvtex
 606
 607                 me = Mesh(bmesh)
 608                 me.transform(m)
 609
 610                 if mesh:
 611                         mesh.splice(me)
 612                 else:
 613                         mesh = me
 614
 615         progress.set_task("Smoothing", 0.3, 0.6)
 616         mesh.prepare_smoothing(progress)
 617         progress.set_task("Vertex groups", 0.6, 0.7)
 618         mesh.prepare_vertex_groups(obj)
 619         progress.set_task("Preparing UVs", 0.7, 1.0)
 620         mesh.prepare_uv(obj, progress)
 621
 622         mesh.drop_references()
 623         for m in bmeshes:
 624                 bpy.data.meshes.remove(m)
 625
 626         progress.pop_task()
 627
 628         return mesh