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 def uvtex_unit_number(uvtex):
 103         dot = uvtex.name.find('.')
 104         if dot!=-1 and uvtex.name[dot+1:dot+5]=="unit" and uvtex.name[dot+5:].isdigit():
 105                 return int(uvtex.name[dot+5])
 106         else:
 107                 return 1000
 108
 109 class Mesh:
 110         def __init__(self, m):
 111                 self._mesh = m
 112
 113                 self.vertices = [Vertex(v) for v in self.vertices]
 114                 self.faces = [Face(f) for f in self.faces]
 115
 116                 self.materials = self.materials[:]
 117
 118                 self.uv_textures = [u for u in self.uv_textures if not u.name.endswith(".hidden")]
 119                 self.uv_textures.sort(key=uvtex_unit_number)
 120
 121                 for f in self.faces:
 122                         f.vertices = [self.vertices[i] for i in f.vertices]
 123                         for v in f.vertices:
 124                                 v.faces.append(f)
 125                         for u in self.uv_textures:
 126                                 r = u.data[f.index].uv_raw;
 127                                 f.uvs.append([(r[i], r[i+1]) for i in range(0, 8, 2)])
 128
 129                 self.edges = dict([(e.key, Edge(e)) for e in self.edges])
 130                 for f in self.faces:
 131                         for k in f.edge_keys:
 132                                 e = self.edges[k]
 133                                 e.faces.append(self.faces[f.index])
 134                                 f.edges.append(e)
 135
 136                 self.lines = [Line(e) for e in self.edges.values() if not e.faces]
 137
 138                 if self.use_auto_smooth:
 139                         smooth_limit = math.cos(self.auto_smooth_angle*math.pi/180)
 140                 else:
 141                         smooth_limit = -1
 142
 143                 for e in self.edges.values():
 144                         e.vertices = [self.vertices[i] for i in e.vertices]
 145                         e.check_smooth(smooth_limit)
 146
 147         def __getattr__(self, attr):
 148                 return getattr(self._mesh, attr)
 149
 150         def splice(self, other):
 151                 material_map = []
 152                 for m in other.materials:
 153                         if m in self.materials:
 154                                 material_map.append(self.materials.index(m))
 155                         else:
 156                                 material_map.append(len(self.materials))
 157                                 self.materials.append(m)
 158
 159                 offset = len(self.vertices)
 160                 for v in other.vertices:
 161                         v.index += offset
 162                         self.vertices.append(v)
 163
 164                 offset = len(self.faces)
 165                 for f in other.faces:
 166                         f.index += offset
 167                         f.material = material_map[f.material_index]
 168                         self.faces.append(f)
 169
 170                 for e in other.edges.values():
 171                         e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 172                         self.edges[e.key] = e
 173
 174                 self.lines += other.lines
 175
 176         def flatten_faces(self):
 177                 for f in self.faces:
 178                         f.use_smooth = False
 179
 180                 for e in self.edges.values():
 181                         e.check_smooth(1)
 182
 183         def generate_material_uv(self):
 184                 for f in self.faces:
 185                         f.uv = ([(f.material_index+0.5)/len(self.materials), 0.5],)*len(f.vertices)
 186                 self.has_uv = True
 187
 188         def split_vertices(self, find_group_func, progress, *args):
 189                 groups = []
 190                 for i in range(len(self.vertices)):
 191                         v = self.vertices[i]
 192                         for f in v.faces:
 193                                 f.flag = False
 194
 195                         vg = []
 196                         for f in v.faces:
 197                                 if not f.flag:
 198                                         vg.append(find_group_func(v, f, *args))
 199
 200                         groups.append(vg)
 201
 202                         if progress:
 203                                 progress.set_progress(i*0.5/len(self.vertices))
 204
 205                 for i in range(len(self.vertices)):
 206                         if len(groups[i])==1:
 207                                 continue
 208
 209                         for g in groups[i][1:]:
 210                                 v = Vertex(self.vertices[i])
 211                                 v.index = len(self.vertices)
 212                                 self.vertices.append(v)
 213
 214                                 for f in g:
 215                                         for j in range(len(f.edges)):
 216                                                 e = f.edges[j]
 217
 218                                                 if self.vertices[i] not in e.vertices:
 219                                                         continue
 220
 221                                                 if e.other_face(f) not in g and len(e.faces)>=2:
 222                                                         e.faces.remove(f)
 223                                                         e = Edge(e)
 224                                                         f.edges[j] = e
 225                                                         e.faces.append(f)
 226                                                 else:
 227                                                         del self.edges[e.key]
 228
 229                                                 e.vertices[e.vertices.index(self.vertices[i])] = v
 230
 231                                                 e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 232                                                 self.edges[e.key] = e
 233
 234                                         self.vertices[i].faces.remove(f)
 235                                         f.vertices[f.vertices.index(self.vertices[i])] = v
 236                                         v.faces.append(f)
 237
 238                         if progress:
 239                                 progress.set_progress(0.5+i*0.5/len(self.vertices))
 240
 241         def split_smooth(self, progress = None):
 242                 self.split_vertices(self.find_smooth_group, progress)
 243
 244         def split_uv(self, index, progress = None):
 245                 self.split_vertices(self.find_uv_group, progress, index)
 246
 247         def find_smooth_group(self, vertex, face):
 248                 face.flag = True
 249                 queue = [face]
 250
 251                 for f in queue:
 252                         for e in f.edges:
 253                                 other = e.other_face(f)
 254                                 if other not in vertex.faces:
 255                                         continue
 256
 257                                 if e.smooth:
 258                                         if not other.flag:
 259                                                 other.flag = True
 260                                                 queue.append(other)
 261
 262                 return queue
 263
 264         def find_uv_group(self, vertex, face, index):
 265                 uv = face.uvs[index][face.vertices.index(vertex)]
 266                 face.flag = True
 267                 group = [face]
 268                 for f in vertex.faces:
 269                         if not f.flag and f.uvs[index][f.vertices.index(vertex)]==uv:
 270                                 f.flag = True
 271                                 group.append(f)
 272                 return group
 273
 274         def compute_normals(self):
 275                 for v in self.vertices:
 276                         if v.faces:
 277                                 v.normal = mathutils.Vector()
 278                                 for f in v.faces:
 279                                         fv = f.pivot_vertices(v)
 280                                         edge1 = fv[1].co-fv[0].co
 281                                         edge2 = fv[-1].co-fv[0].co
 282                                         weight = 1
 283                                         if len(f.get_edge(fv[0], fv[1]).faces)==1:
 284                                                 weight += 1
 285                                         if len(f.get_edge(fv[0], fv[-1]).faces)==1:
 286                                                 weight += 1
 287                                         v.normal += f.normal*edge1.angle(edge2)*weight
 288                                 v.normal.normalize()
 289                         else:
 290                                 # XXX Should use edges to compute normal
 291                                 v.normal = mathutils.Vector(0, 0, 1)
 292
 293         def compute_uv(self):
 294                 for v in self.vertices:
 295                         if v.faces:
 296                                 f = v.faces[0]
 297                                 i = f.vertices.index(v)
 298                                 v.uvs = [u[i] for u in f.uvs]
 299
 300         def compute_tbn(self, index):
 301                 if not self.uv_textures:
 302                         return
 303
 304                 for v in self.vertices:
 305                         v.tan = mathutils.Vector()
 306                         v.bino = mathutils.Vector()
 307                         for f in v.faces:
 308                                 fv = f.pivot_vertices(v)
 309                                 uv0 = fv[0].uvs[index]
 310                                 uv1 = fv[1].uvs[index]
 311                                 uv2 = fv[-1].uvs[index]
 312                                 du1 = uv1[0]-uv0[0]
 313                                 du2 = uv2[0]-uv0[0]
 314                                 dv1 = uv1[1]-uv0[1]
 315                                 dv2 = uv2[1]-uv0[1]
 316                                 edge1 = fv[1].co-fv[0].co
 317                                 edge2 = fv[-1].co-fv[0].co
 318                                 div = (du1*dv2-du2*dv1)
 319                                 if div:
 320                                         mul = edge1.angle(edge2)/div
 321                                         v.tan += (edge1*dv2-edge2*dv1)*mul
 322                                         v.bino += (edge2*du1-edge1*du2)*mul
 323
 324                         if v.tan.length:
 325                                 v.tan.normalize()
 326                         if v.bino.length:
 327                                 v.bino.normalize()
 328
 329         def create_strip(self, face, max_len):
 330                 edge = None
 331                 for e in face.edges:
 332                         other = e.other_face(face)
 333                         if other and not other.flag:
 334                                 edge = e
 335                                 break
 336
 337                 if not edge:
 338                         return None
 339
 340                 vertices = face.pivot_vertices(*edge.vertices)
 341                 if len(vertices)==3:
 342                         result = [vertices[-1], vertices[0]]
 343                 else:
 344                         result = [vertices[-2], vertices[-1]]
 345
 346                 while 1:
 347                         vertices = face.pivot_vertices(*result[-2:])
 348                         k = len(result)%2
 349
 350                         face.flag = True
 351                         if len(vertices)==4 and not k:
 352                                 result.append(vertices[3])
 353                         result.append(vertices[2])
 354                         if len(vertices)==4 and k:
 355                                 result.append(vertices[3])
 356
 357                         if len(result)>=max_len:
 358                                 break
 359
 360                         edge = face.get_edge(*result[-2:])
 361
 362                         next = edge.other_face(face)
 363                         if not next or next.flag:
 364                                 break
 365                         face = next
 366
 367                 return result