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 FakeUvTex:
 103         def __init__(self, n):
 104                 self.name = n
 105
 106 def uvtex_unit_number(uvtex):
 107         dot = uvtex.name.find('.')
 108         if dot!=-1 and uvtex.name[dot+1:dot+5]=="unit" and uvtex.name[dot+5:].isdigit():
 109                 return int(uvtex.name[dot+5])
 110         else:
 111                 return 1000
 112
 113 class Mesh:
 114         def __init__(self, m):
 115                 self._mesh = m
 116
 117                 self.vertices = [Vertex(v) for v in self.vertices]
 118                 self.faces = [Face(f) for f in self.faces]
 119
 120                 self.materials = self.materials[:]
 121
 122                 self.uv_textures = [u for u in self.uv_textures if not u.name.endswith(".hidden")]
 123                 self.uv_textures.sort(key=uvtex_unit_number)
 124
 125                 for f in self.faces:
 126                         f.vertices = [self.vertices[i] for i in f.vertices]
 127                         for v in f.vertices:
 128                                 v.faces.append(f)
 129                         for u in self.uv_textures:
 130                                 r = u.data[f.index].uv_raw;
 131                                 f.uvs.append([(r[i], r[i+1]) for i in range(0, 8, 2)])
 132
 133                 self.edges = dict([(e.key, Edge(e)) for e in self.edges])
 134                 for f in self.faces:
 135                         for k in f.edge_keys:
 136                                 e = self.edges[k]
 137                                 e.faces.append(self.faces[f.index])
 138                                 f.edges.append(e)
 139
 140                 self.lines = [Line(e) for e in self.edges.values() if not e.faces]
 141
 142                 if self.use_auto_smooth:
 143                         smooth_limit = math.cos(self.auto_smooth_angle*math.pi/180)
 144                 else:
 145                         smooth_limit = -1
 146
 147                 for e in self.edges.values():
 148                         e.vertices = [self.vertices[i] for i in e.vertices]
 149                         e.check_smooth(smooth_limit)
 150
 151         def __getattr__(self, attr):
 152                 return getattr(self._mesh, attr)
 153
 154         def splice(self, other):
 155                 material_map = []
 156                 for m in other.materials:
 157                         if m in self.materials:
 158                                 material_map.append(self.materials.index(m))
 159                         else:
 160                                 material_map.append(len(self.materials))
 161                                 self.materials.append(m)
 162
 163                 offset = len(self.vertices)
 164                 for v in other.vertices:
 165                         v.index += offset
 166                         self.vertices.append(v)
 167
 168                 offset = len(self.faces)
 169                 for f in other.faces:
 170                         f.index += offset
 171                         f.material = material_map[f.material_index]
 172                         self.faces.append(f)
 173
 174                 for e in other.edges.values():
 175                         e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 176                         self.edges[e.key] = e
 177
 178                 self.lines += other.lines
 179
 180         def flatten_faces(self):
 181                 for f in self.faces:
 182                         f.use_smooth = False
 183
 184                 for e in self.edges.values():
 185                         e.check_smooth(1)
 186
 187         def generate_material_uv(self):
 188                 self.uv_textures.append(FakeUvTex("material_tex"))
 189                 for f in self.faces:
 190                         f.uvs.append([((f.material_index+0.5)/len(self.materials), 0.5)]*len(f.vertices))
 191
 192         def split_vertices(self, find_group_func, progress, *args):
 193                 groups = []
 194                 for i in range(len(self.vertices)):
 195                         v = self.vertices[i]
 196                         for f in v.faces:
 197                                 f.flag = False
 198
 199                         vg = []
 200                         for f in v.faces:
 201                                 if not f.flag:
 202                                         vg.append(find_group_func(v, f, *args))
 203
 204                         groups.append(vg)
 205
 206                         if progress:
 207                                 progress.set_progress(i*0.5/len(self.vertices))
 208
 209                 for i in range(len(self.vertices)):
 210                         if len(groups[i])==1:
 211                                 continue
 212
 213                         for g in groups[i][1:]:
 214                                 v = Vertex(self.vertices[i])
 215                                 v.index = len(self.vertices)
 216                                 self.vertices.append(v)
 217
 218                                 for f in g:
 219                                         for j in range(len(f.edges)):
 220                                                 e = f.edges[j]
 221
 222                                                 if self.vertices[i] not in e.vertices:
 223                                                         continue
 224
 225                                                 if e.other_face(f) not in g and len(e.faces)>=2:
 226                                                         e.faces.remove(f)
 227                                                         e = Edge(e)
 228                                                         f.edges[j] = e
 229                                                         e.faces.append(f)
 230                                                 else:
 231                                                         del self.edges[e.key]
 232
 233                                                 e.vertices[e.vertices.index(self.vertices[i])] = v
 234
 235                                                 e.key = make_edge_key(e.vertices[0].index, e.vertices[1].index)
 236                                                 self.edges[e.key] = e
 237
 238                                         self.vertices[i].faces.remove(f)
 239                                         f.vertices[f.vertices.index(self.vertices[i])] = v
 240                                         v.faces.append(f)
 241
 242                         if progress:
 243                                 progress.set_progress(0.5+i*0.5/len(self.vertices))
 244
 245         def split_smooth(self, progress = None):
 246                 self.split_vertices(self.find_smooth_group, progress)
 247
 248         def split_uv(self, index, progress = None):
 249                 self.split_vertices(self.find_uv_group, progress, index)
 250
 251         def find_smooth_group(self, vertex, face):
 252                 face.flag = True
 253                 queue = [face]
 254
 255                 for f in queue:
 256                         for e in f.edges:
 257                                 other = e.other_face(f)
 258                                 if other not in vertex.faces:
 259                                         continue
 260
 261                                 if e.smooth:
 262                                         if not other.flag:
 263                                                 other.flag = True
 264                                                 queue.append(other)
 265
 266                 return queue
 267
 268         def find_uv_group(self, vertex, face, index):
 269                 uv = face.uvs[index][face.vertices.index(vertex)]
 270                 face.flag = True
 271                 group = [face]
 272                 for f in vertex.faces:
 273                         if not f.flag and f.uvs[index][f.vertices.index(vertex)]==uv:
 274                                 f.flag = True
 275                                 group.append(f)
 276                 return group
 277
 278         def compute_normals(self):
 279                 for v in self.vertices:
 280                         if v.faces:
 281                                 v.normal = mathutils.Vector()
 282                                 for f in v.faces:
 283                                         fv = f.pivot_vertices(v)
 284                                         edge1 = fv[1].co-fv[0].co
 285                                         edge2 = fv[-1].co-fv[0].co
 286                                         weight = 1
 287                                         if len(f.get_edge(fv[0], fv[1]).faces)==1:
 288                                                 weight += 1
 289                                         if len(f.get_edge(fv[0], fv[-1]).faces)==1:
 290                                                 weight += 1
 291                                         v.normal += f.normal*edge1.angle(edge2)*weight
 292                                 v.normal.normalize()
 293                         else:
 294                                 # XXX Should use edges to compute normal
 295                                 v.normal = mathutils.Vector(0, 0, 1)
 296
 297         def compute_uv(self):
 298                 for v in self.vertices:
 299                         if v.faces:
 300                                 f = v.faces[0]
 301                                 i = f.vertices.index(v)
 302                                 v.uvs = [u[i] for u in f.uvs]
 303
 304         def compute_tbn(self, index):
 305                 if not self.uv_textures:
 306                         return
 307
 308                 for v in self.vertices:
 309                         v.tan = mathutils.Vector()
 310                         v.bino = mathutils.Vector()
 311                         for f in v.faces:
 312                                 fv = f.pivot_vertices(v)
 313                                 uv0 = fv[0].uvs[index]
 314                                 uv1 = fv[1].uvs[index]
 315                                 uv2 = fv[-1].uvs[index]
 316                                 du1 = uv1[0]-uv0[0]
 317                                 du2 = uv2[0]-uv0[0]
 318                                 dv1 = uv1[1]-uv0[1]
 319                                 dv2 = uv2[1]-uv0[1]
 320                                 edge1 = fv[1].co-fv[0].co
 321                                 edge2 = fv[-1].co-fv[0].co
 322                                 div = (du1*dv2-du2*dv1)
 323                                 if div:
 324                                         mul = edge1.angle(edge2)/div
 325                                         v.tan += (edge1*dv2-edge2*dv1)*mul
 326                                         v.bino += (edge2*du1-edge1*du2)*mul
 327
 328                         if v.tan.length:
 329                                 v.tan.normalize()
 330                         if v.bino.length:
 331                                 v.bino.normalize()
 332
 333         def create_strip(self, face, max_len):
 334                 edge = None
 335                 for e in face.edges:
 336                         other = e.other_face(face)
 337                         if other and not other.flag:
 338                                 edge = e
 339                                 break
 340
 341                 if not edge:
 342                         return None
 343
 344                 vertices = face.pivot_vertices(*edge.vertices)
 345                 if len(vertices)==3:
 346                         result = [vertices[-1], vertices[0]]
 347                 else:
 348                         result = [vertices[-2], vertices[-1]]
 349
 350                 while 1:
 351                         vertices = face.pivot_vertices(*result[-2:])
 352                         k = len(result)%2
 353
 354                         face.flag = True
 355                         if len(vertices)==4 and not k:
 356                                 result.append(vertices[3])
 357                         result.append(vertices[2])
 358                         if len(vertices)==4 and k:
 359                                 result.append(vertices[3])
 360
 361                         if len(result)>=max_len:
 362                                 break
 363
 364                         edge = face.get_edge(*result[-2:])
 365
 366                         next = edge.other_face(face)
 367                         if not next or next.flag:
 368                                 break
 369                         face = next
 370
 371                 return result