blender/io_mesh_mspgl/mesh.py

   1 import math
   2 import mathutils
   3
   4 def make_edge_key(i1, i2):
   5         return (min(i1, i2), max(i1, i2))
   6
   7 class Edge:
   8         def __init__(self, me):
   9                 if me.__class__==Edge:
  10                         self._medge = me._medge
  11                         self.vertices = me.vertices[:]
  12                         self.smooth = me.smooth
  13                 else:
  14                         self._medge = me
  15                         self.smooth = False
  16                 self.faces = []
  17
  18         def __getattr__(self, attr):
  19                 return getattr(self._medge, attr)
  20
  21         def check_smooth(self, limit):
  22                 if len(self.faces)!=2:
  23                         return
  24
  25                 d = self.faces[0].normal.dot(self.faces[1].normal)
  26                 self.smooth = ((d>limit and self.faces[0].use_smooth and self.faces[1].use_smooth) or d>0.99995)
  27
  28         def other_face(self, f):
  29                 if f.index==self.faces[0].index:
  30                         if len(self.faces)>=2:
  31                                 return self.faces[1]
  32                         else:
  33                                 return None
  34                 else:
  35                         return self.faces[0]
  36
  37
  38 class Vertex:
  39         def __init__(self, mv):
  40                 if mv.__class__==Vertex:
  41                         self._mvert = mv._mvert
  42                         self.normal = mv.normal
  43                         self.uvs = mv.uvs[:]
  44                         self.tan = mv.tan
  45                         self.bino = mv.bino
  46                 else:
  47                         self._mvert = mv
  48                         self.uvs = []
  49                         self.tan = None
  50                         self.bino = None
  51                 self.flag = False
  52                 self.faces = []
  53
  54         def __getattr__(self, attr):
  55                 return getattr(self._mvert, attr)
  56
  57         def __cmp__(self, other):
  58                 if other is None:
  59                         return 1
  60                 return cmp(self.index, other.index)
  61
  62
  63 class Face:
  64         def __init__(self, mf):
  65                 self._mface = mf
  66                 self.edges = []
  67                 self.vertices = mf.vertices[:]
  68                 self.uvs = []
  69                 self.flag = False
  70                 self.material = None
  71
  72         def __getattr__(self, attr):
  73                 return getattr(self._mface, attr)
  74
  75         def __cmp__(self, other):
  76                 if other is None:
  77                         return 1
  78                 return cmp(self.index, other.index)
  79
  80         def pivot_vertices(self, *vt):
  81                 flags = [(v in vt) for v in self.vertices]
  82                 l = len(self.vertices)
  83                 for i in range(l):
  84                         if flags[i] and not flags[(i+l-1)%l]:
  85                                 return self.vertices[i:]+self.vertices[:i]
  86
  87         def get_edge(self, v1, v2):
  88                 key = make_edge_key(v1.index, v2.index)
  89                 for e in self.edges:
  90                         if e.key==key:
  91                                 return e
  92                 raise KeyError("No edge %s"%(key,))
  93
  94
  95 class Line:
  96         def __init__(self, e):
  97                 self.edge = e
  98                 self.vertices = e.vertices[:]
  99                 self.flag = False
 100
 101
 102 class UvLayer:
 103         def __init__(self, l):
 104                 self._layer = l
 105                 self.name = None
 106
 107         def __getattr__(self, attr):
 108                 return getattr(self._layer, attr)
 109
 110 class FakeUvLayer:
 111         def __init__(self, n):
 112                 self.name = n
 113
 114 def uvtex_unit_number(uvtex):
 115         dot = uvtex.name.find('.')
 116         if dot!=-1 and uvtex.name[dot+1:dot+5]=="unit" and uvtex.name[dot+5:].isdigit():
 117                 return int(uvtex.name[dot+5])
 118         else:
 119                 return 1000
 120
 121 class Mesh:
 122         def __init__(self, m):
 123                 self._mesh = m
 124
 125                 self.vertices = [Vertex(v) for v in self.vertices]
 126                 self.faces = [Face(f) for f in self.polygons]
 127
 128                 self.materials = self.materials[:]
 129
 130                 self.uv_layers = [UvLayer(u) for u in self.uv_layers]
 131                 for i in range(len(self.uv_layers)):
 132                         self.uv_layers[i].name = self.uv_textures[i].name
 133                 self.uv_layers = [u for u in self.uv_layers if not u.name.endswith(".hidden")]
 134                 self.uv_layers.sort(key=uvtex_unit_number)
 135
 136                 for f in self.faces:
 137                         f.vertices = [self.vertices[i] for i in f.vertices]
 138                         for v in f.vertices:
 139                                 v.faces.append(f)
 140                         for u in self.uv_layers:
 141                                 f.uvs.append([u.data[f.loop_indices[i]].uv for i in range(len(f.vertices))])
 142
 143                 self.edges = dict([(e.key, Edge(e)) for e in self.edges])
 144                 for f in self.faces:
 145                         for k in f.edge_keys:
 146                                 e = self.edges[k]
 147                                 e.faces.append(self.faces[f.index])
 148                                 f.edges.append(e)
 149
 150                 self.lines = [Line(e) for e in self.edges.values() if not e.faces]
 151
 152                 if self.use_auto_smooth:
 153                         smooth_limit = math.cos(self.auto_smooth_angle*math.pi/180)
 154                 else:
 155                         smooth_limit = -1
 156
 157                 for e in self.edges.values():
 158                         e.vertices = [self.vertices[i] for i in e.vertices]
 159                         e.check_smooth(smooth_limit)
 160
 161         def __getattr__(self, attr):
 162                 return getattr(self._mesh, attr)
 163
 164         def splice(self, other):
 165                 material_map = []
 166                 for m in other.materials:
 167                         if m in self.materials:
 168                                 material_map.append(self.materials.index(m))
 169                         else:
 170                                 material_map.append(len(self.materials))
 171                                 self.materials.append(m)
 172
 173                 offset = len(self.vertices)
 174                 for v in other.vertices:
 175                         v.index += offset
 176                         self.vertices.append(v)
 177
 178                 offset = len(self.faces)
 179                 for f in other.faces:
 180                         f.index += offset
 181                         f.material = material_map[f.material_index]
 182                         self.faces.append(f)
 183
 184                 for e in other.edges.values():
 185                         e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 186                         self.edges[e.key] = e
 187
 188                 self.lines += other.lines
 189
 190         def flatten_faces(self):
 191                 for f in self.faces:
 192                         f.use_smooth = False
 193
 194                 for e in self.edges.values():
 195                         e.check_smooth(1)
 196
 197         def generate_material_uv(self):
 198                 self.uv_layers.append(FakeUvLayer("material_tex"))
 199                 for f in self.faces:
 200                         f.uvs.append([((f.material_index+0.5)/len(self.materials), 0.5)]*len(f.vertices))
 201
 202         def split_vertices(self, find_group_func, progress, *args):
 203                 groups = []
 204                 for i in range(len(self.vertices)):
 205                         v = self.vertices[i]
 206                         for f in v.faces:
 207                                 f.flag = False
 208
 209                         vg = []
 210                         for f in v.faces:
 211                                 if not f.flag:
 212                                         vg.append(find_group_func(v, f, *args))
 213
 214                         groups.append(vg)
 215
 216                         if progress:
 217                                 progress.set_progress(i*0.5/len(self.vertices))
 218
 219                 for i in range(len(self.vertices)):
 220                         if len(groups[i])==1:
 221                                 continue
 222
 223                         for g in groups[i][1:]:
 224                                 v = Vertex(self.vertices[i])
 225                                 v.index = len(self.vertices)
 226                                 self.vertices.append(v)
 227
 228                                 for f in g:
 229                                         for j in range(len(f.edges)):
 230                                                 e = f.edges[j]
 231
 232                                                 if self.vertices[i] not in e.vertices:
 233                                                         continue
 234
 235                                                 if e.other_face(f) not in g and len(e.faces)>=2:
 236                                                         e.faces.remove(f)
 237                                                         e = Edge(e)
 238                                                         f.edges[j] = e
 239                                                         e.faces.append(f)
 240                                                 else:
 241                                                         del self.edges[e.key]
 242
 243                                                 e.vertices[e.vertices.index(self.vertices[i])] = v
 244
 245                                                 e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 246                                                 self.edges[e.key] = e
 247
 248                                         self.vertices[i].faces.remove(f)
 249                                         f.vertices[f.vertices.index(self.vertices[i])] = v
 250                                         v.faces.append(f)
 251
 252                         if progress:
 253                                 progress.set_progress(0.5+i*0.5/len(self.vertices))
 254
 255         def split_smooth(self, progress = None):
 256                 self.split_vertices(self.find_smooth_group, progress)
 257
 258         def split_uv(self, index, progress = None):
 259                 self.split_vertices(self.find_uv_group, progress, index)
 260
 261         def find_smooth_group(self, vertex, face):
 262                 face.flag = True
 263                 queue = [face]
 264
 265                 for f in queue:
 266                         for e in f.edges:
 267                                 other = e.other_face(f)
 268                                 if other not in vertex.faces:
 269                                         continue
 270
 271                                 if e.smooth:
 272                                         if not other.flag:
 273                                                 other.flag = True
 274                                                 queue.append(other)
 275
 276                 return queue
 277
 278         def find_uv_group(self, vertex, face, index):
 279                 uv = face.uvs[index][face.vertices.index(vertex)]
 280                 face.flag = True
 281                 group = [face]
 282                 for f in vertex.faces:
 283                         if not f.flag and f.uvs[index][f.vertices.index(vertex)]==uv:
 284                                 f.flag = True
 285                                 group.append(f)
 286                 return group
 287
 288         def compute_normals(self):
 289                 for v in self.vertices:
 290                         if v.faces:
 291                                 v.normal = mathutils.Vector()
 292                                 for f in v.faces:
 293                                         fv = f.pivot_vertices(v)
 294                                         edge1 = fv[1].co-fv[0].co
 295                                         edge2 = fv[-1].co-fv[0].co
 296                                         weight = 1
 297                                         if len(f.get_edge(fv[0], fv[1]).faces)==1:
 298                                                 weight += 1
 299                                         if len(f.get_edge(fv[0], fv[-1]).faces)==1:
 300                                                 weight += 1
 301                                         v.normal += f.normal*edge1.angle(edge2)*weight
 302                                 v.normal.normalize()
 303                         else:
 304                                 # XXX Should use edges to compute normal
 305                                 v.normal = mathutils.Vector(0, 0, 1)
 306
 307         def compute_uv(self):
 308                 for v in self.vertices:
 309                         if v.faces:
 310                                 f = v.faces[0]
 311                                 i = f.vertices.index(v)
 312                                 v.uvs = [u[i] for u in f.uvs]
 313
 314         def compute_tbn(self, index):
 315                 if not self.uv_layers:
 316                         return
 317
 318                 for v in self.vertices:
 319                         v.tan = mathutils.Vector()
 320                         v.bino = mathutils.Vector()
 321                         for f in v.faces:
 322                                 fv = f.pivot_vertices(v)
 323                                 uv0 = fv[0].uvs[index]
 324                                 uv1 = fv[1].uvs[index]
 325                                 uv2 = fv[-1].uvs[index]
 326                                 du1 = uv1[0]-uv0[0]
 327                                 du2 = uv2[0]-uv0[0]
 328                                 dv1 = uv1[1]-uv0[1]
 329                                 dv2 = uv2[1]-uv0[1]
 330                                 edge1 = fv[1].co-fv[0].co
 331                                 edge2 = fv[-1].co-fv[0].co
 332                                 div = (du1*dv2-du2*dv1)
 333                                 if div:
 334                                         mul = edge1.angle(edge2)/div
 335                                         v.tan += (edge1*dv2-edge2*dv1)*mul
 336                                         v.bino += (edge2*du1-edge1*du2)*mul
 337
 338                         if v.tan.length:
 339                                 v.tan.normalize()
 340                         if v.bino.length:
 341                                 v.bino.normalize()
 342
 343         def create_strip(self, face, max_len):
 344                 edge = None
 345                 for e in face.edges:
 346                         other = e.other_face(face)
 347                         if other and not other.flag:
 348                                 edge = e
 349                                 break
 350
 351                 if not edge:
 352                         return None
 353
 354                 vertices = face.pivot_vertices(*edge.vertices)
 355                 if len(vertices)==3:
 356                         result = [vertices[-1], vertices[0]]
 357                 else:
 358                         result = [vertices[-2], vertices[-1]]
 359
 360                 while 1:
 361                         vertices = face.pivot_vertices(*result[-2:])
 362                         k = len(result)%2
 363
 364                         face.flag = True
 365                         if len(vertices)==4 and not k:
 366                                 result.append(vertices[3])
 367                         result.append(vertices[2])
 368                         if len(vertices)==4 and k:
 369                                 result.append(vertices[3])
 370
 371                         if len(result)>=max_len:
 372                                 break
 373
 374                         edge = face.get_edge(*result[-2:])
 375
 376                         next = edge.other_face(face)
 377                         if not next or next.flag:
 378                                 break
 379                         face = next
 380
 381                 return result