blender/io_mspgl/export_mesh.py

   1 import itertools
   2 import bpy
   3 from .outfile import OutFile
   4
   5 class VertexCache:
   6         def __init__(self, size):
   7                 self.size = size
   8                 self.slots = [-1]*self.size
   9
  10         def fetch(self, v):
  11                 hit = v.index in self.slots
  12                 if hit:
  13                         self.slots.remove(v.index)
  14                 self.slots.append(v.index)
  15                 if not hit:
  16                         del self.slots[0]
  17                 return hit
  18
  19         def fetch_strip(self, strip):
  20                 hits = 0
  21                 for v in strip:
  22                         if self.fetch(v):
  23                                 hits += 1
  24                 return hits
  25
  26         def test_strip(self, strip):
  27                 hits = 0
  28                 for i in range(len(strip)):
  29                         if i>=self.size:
  30                                 break
  31                         if strip[i].index in self.slots[i:]:
  32                                 hits += 1
  33                 return hits
  34
  35
  36 class MeshExporter:
  37         def __init__(self):
  38                 self.use_strips = True
  39                 self.use_degen_tris = True
  40                 self.max_strip_len = 1024
  41                 self.optimize_cache = False
  42                 self.cache_size = 64
  43                 self.export_lines = True
  44                 self.export_uv = "UNIT0"
  45                 self.tbn_vecs = False
  46                 self.tbn_uvtex = ""
  47                 self.compound = False
  48                 self.object = False
  49                 self.material_tex = False
  50                 self.textures = "REF"
  51                 self.smoothing = "MSPGL"
  52                 self.export_groups = False
  53                 self.max_groups = 2
  54
  55         def stripify(self, mesh, progress = None):
  56                 for f in mesh.faces:
  57                         f.flag = False
  58
  59                 faces_done = 0
  60                 strips = []
  61                 loose = []
  62
  63                 cache = None
  64                 if self.optimize_cache:
  65                         cache = VertexCache(self.cache_size)
  66
  67                 island = []
  68                 island_strips = []
  69                 while 1:
  70                         if not island:
  71                                 # No current island; find any unused face to start from
  72                                 queue = []
  73                                 for f in mesh.faces:
  74                                         if not f.flag:
  75                                                 f.flag = True
  76                                                 queue.append(f)
  77                                                 break
  78
  79                                 if not queue:
  80                                         break
  81
  82                                 # Find all faces connected to the first one
  83                                 while queue:
  84                                         face = queue.pop(0)
  85                                         island.append(face)
  86
  87                                         for n in f.get_neighbors():
  88                                                 if not n.flag:
  89                                                         n.flag = True
  90                                                         queue.append(n)
  91
  92                                 # Unflag the island for the next phase
  93                                 for f in island:
  94                                         f.flag = False
  95
  96                         # Find an unused face with as few unused neighbors as possible, but
  97                         # at least one.  This heuristic gives a preference to faces in corners
  98                         # or along borders of a non-closed island.
  99                         best = 5
 100                         face = None
 101                         for f in island:
 102                                 if f.flag:
 103                                         continue
 104
 105                                 score = sum(not n.flag for n in f.get_neighbors())
 106                                 if score>0 and score<best:
 107                                         face = f
 108                                         best = score
 109
 110                         if face:
 111                                 # Create a strip starting from the face.  This will flag the faces.
 112                                 strip = mesh.create_strip(face, self.max_strip_len)
 113                                 if strip:
 114                                         island_strips.append(strip)
 115                                 else:
 116                                         face.flag = True
 117                         else:
 118                                 # Couldn't find a candidate face for starting a strip, so we're
 119                                 # done with this island
 120                                 while island_strips:
 121                                         best = 0
 122                                         if cache:
 123                                                 # Find the strip that benefits the most from the current
 124                                                 # contents of the vertex cache
 125                                                 best_hits = 0
 126                                                 for i in range(len(island_strips)):
 127                                                         hits = cache.test_strip(island_strips[i])
 128                                                         if hits>best_hits:
 129                                                                 best = i
 130                                                                 best_hits = hits
 131
 132                                         strip = island_strips.pop(best)
 133                                         strips.append(strip)
 134
 135                                         if cache:
 136                                                 cache.fetch_strip(strip)
 137
 138                                 faces_done += len(island)
 139                                 if progress:
 140                                         progress.set_progress(float(faces_done)/len(mesh.faces))
 141
 142                                 # Collect any faces that weren't used in strips
 143                                 loose += [f for f in island if not f.flag]
 144                                 for f in island:
 145                                         f.flag = True
 146
 147                                 island = []
 148                                 island_strips = []
 149
 150                 if cache:
 151                         cache = VertexCache(self.cache_size)
 152                         total_hits = 0
 153
 154                 if self.use_degen_tris and strips:
 155                         big_strip = []
 156
 157                         for s in strips:
 158                                 if big_strip:
 159                                         # Generate glue elements, ensuring that the next strip begins at
 160                                         # an even position
 161                                         glue = [big_strip[-1], s[0]]
 162                                         if len(big_strip)%2:
 163                                                 glue += [s[0]]
 164
 165                                         big_strip += glue
 166                                         if cache:
 167                                                 total_hits += cache.fetch_strip(glue)
 168
 169                                 big_strip += s
 170                                 if cache:
 171                                         total_hits += cache.fetch_strip(s)
 172
 173                         for f in loose:
 174                                 # Add loose faces to the end.  This wastes space, using five
 175                                 # elements per triangle and six elements per quad.
 176                                 if len(big_strip)%2:
 177                                         order = (-1, -2, 0, 1)
 178                                 else:
 179                                         order = (0, 1, -1, -2)
 180                                 vertices = [f.vertices[i] for i in order[:len(f.vertices)]]
 181
 182                                 if big_strip:
 183                                         glue = [big_strip[-1], vertices[0]]
 184                                         big_strip += glue
 185                                         if cache:
 186                                                 total_hits += cache.fetch_strip(glue)
 187
 188                                 big_strip += vertices
 189                                 if cache:
 190                                         total_hits += cache.fetch_strip(vertices)
 191
 192                         strips = [big_strip]
 193                         loose = []
 194
 195                 return strips, loose
 196
 197         def export(self, context, fn):
 198                 if self.compound:
 199                         objs = context.selected_objects
 200                 else:
 201                         objs = [context.active_object]
 202
 203                 if not objs:
 204                         raise Exception("Nothing to export")
 205                 for o in objs:
 206                         if o.type!="MESH":
 207                                 raise Exception("Can only export Mesh data")
 208
 209                 from .mesh import Mesh
 210                 from .util import Progress
 211
 212                 progress = Progress()
 213                 progress.set_task("Preparing", 0.0, 0.0)
 214
 215                 mesh = None
 216                 bmeshes = []
 217                 for o in objs:
 218                         bmesh = o.to_mesh(context.scene, True, "PREVIEW")
 219                         bmeshes.append(bmesh)
 220                         if not mesh:
 221                                 mesh = Mesh(bmesh)
 222                         else:
 223                                 mesh.splice(Mesh(bmesh))
 224
 225                 progress.set_task("Smoothing", 0.05, 0.35)
 226                 if self.smoothing=="NONE":
 227                         mesh.flatten_faces()
 228                 mesh.split_smooth(progress)
 229
 230                 if self.smoothing!="BLENDER":
 231                         mesh.compute_normals()
 232
 233                 if self.export_groups:
 234                         mesh.sort_vertex_groups(self.max_groups)
 235
 236                         # Create a mapping from vertex group indices to bone indices
 237                         group_index_map = dict((i, i) for i in range(len(objs[0].vertex_groups)))
 238                         if objs[0].parent and objs[0].parent.type=="ARMATURE":
 239                                 armature = objs[0].parent.data
 240                                 bone_indices = dict((armature.bones[i].name, i) for i in range(len(armature.bones)))
 241                                 for g in objs[0].vertex_groups:
 242                                         if g.name in bone_indices:
 243                                                 group_index_map[g.index] = bone_indices[g.name]
 244
 245                 if self.material_tex and mesh.materials:
 246                         mesh.generate_material_uv()
 247
 248                 texunits = []
 249                 if mesh.uv_layers and self.export_uv!="NONE":
 250                         # Figure out which UV layers to export
 251                         if self.export_uv=="UNIT0":
 252                                 if mesh.uv_layers[0].unit==0:
 253                                         texunits = [0]
 254                         else:
 255                                 texunits = range(len(mesh.uv_layers))
 256                         texunits = [(i, mesh.uv_layers[i]) for i in texunits]
 257                         texunits = [u for u in texunits if not u[1].hidden]
 258
 259                         if self.tbn_vecs:
 260                                 # TBN coordinates must be generated before vertices are split by any other layer
 261                                 uv_names = [u.name for i, u in texunits]
 262                                 if self.tbn_uvtex in uv_names:
 263                                         tbn_index = uv_names.index(self.tbn_uvtex)
 264                                         unit = texunits[tbn_index]
 265                                         del texunits[tbn_index]
 266                                         texunits.insert(0, unit)
 267
 268                         for i, u in texunits:
 269                                 progress.set_task("Splitting UVs", 0.35+0.3*i/len(texunits), 0.35+0.3*(i+1)/len(texunits))
 270                                 mesh.split_uv(i, progress)
 271                                 if self.tbn_vecs and u.name==self.tbn_uvtex:
 272                                         mesh.compute_uv()
 273                                         mesh.compute_tbn(i)
 274
 275                         mesh.compute_uv()
 276
 277                 strips = []
 278                 loose = mesh.faces
 279                 if self.use_strips:
 280                         progress.set_task("Creating strips", 0.65, 0.95)
 281                         strips, loose = self.stripify(mesh, progress)
 282
 283                 progress.set_task("Writing file", 0.95, 1.0)
 284
 285                 out_file = OutFile(fn)
 286                 if self.object:
 287                         out_file.begin("mesh")
 288
 289                 fmt = "NORMAL3"
 290                 if texunits:
 291                         for i, u in texunits:
 292                                 if u.unit==0:
 293                                         fmt += "_TEXCOORD2"
 294                                 else:
 295                                         fmt += "_TEXCOORD2%d"%u.unit
 296                         if self.tbn_vecs:
 297                                 fmt += "_ATTRIB33_ATTRIB34"
 298                 if self.export_groups:
 299                         fmt += "_ATTRIB%d5"%(self.max_groups*2)
 300                 fmt += "_VERTEX3"
 301                 out_file.begin("vertices", fmt)
 302                 normal = None
 303                 uvs = [None]*len(texunits)
 304                 tan = None
 305                 bino = None
 306                 group = None
 307                 for v in mesh.vertices:
 308                         if v.normal!=normal:
 309                                 out_file.write("normal3", *v.normal)
 310                                 normal = v.normal
 311                         for i, u in texunits:
 312                                 if v.uvs[i]!=uvs[i]:
 313                                         if u.unit==0:
 314                                                 out_file.write("texcoord2", *v.uvs[i])
 315                                         else:
 316                                                 out_file.write("multitexcoord2", u.unit, *v.uvs[i])
 317                                         uvs[i] = v.uvs[i]
 318                         if self.tbn_vecs:
 319                                 if v.tan!=tan:
 320                                         out_file.write("attrib3", 3, *v.tan)
 321                                         tan = v.tan
 322                                 if v.bino!=bino:
 323                                         out_file.write("attrib3", 4, *v.bino)
 324                                         bino = v.bino
 325                         if self.export_groups:
 326                                 group_attr = [(group_index_map[g.group], g.weight*v.group_weight_scale) for g in v.groups[:self.max_groups]]
 327                                 while len(group_attr)<self.max_groups:
 328                                         group_attr.append((0, 0.0))
 329                                 group_attr = list(itertools.chain(*group_attr))
 330                                 if group_attr!=group:
 331                                         out_file.write("attrib%d"%len(group_attr), 5, *group_attr)
 332                                         group = group_attr
 333                         out_file.write("vertex3", *v.co)
 334                 out_file.end()
 335                 for s in strips:
 336                         out_file.begin("batch", "TRIANGLE_STRIP")
 337                         indices = []
 338                         n = 0
 339                         for v in s:
 340                                 indices.append(v.index)
 341                                 if len(indices)>=32:
 342                                         out_file.write("indices", *indices)
 343                                         indices = []
 344                         if indices:
 345                                 out_file.write("indices", *indices)
 346                         out_file.end()
 347
 348                 if loose:
 349                         out_file.begin("batch", "TRIANGLES")
 350                         for f in loose:
 351                                 for i in range(2, len(f.vertices)):
 352                                         out_file.write("indices", f.vertices[0].index, f.vertices[i-1].index, f.vertices[i].index)
 353                         out_file.end()
 354
 355                 if self.export_lines and mesh.lines:
 356                         out_file.write("batch", "LINES")
 357                         for l in mesh.lines:
 358                                 out_file.write("indices", l.vertices[0].index, l.vertices[1].index)
 359                         out_file.end()
 360
 361                 if self.object:
 362                         out_file.end()
 363                         out_file.begin("technique")
 364                         out_file.begin("pass", '""')
 365                         if mesh.materials:
 366                                 if self.material_tex:
 367                                         out_file.begin("material")
 368                                         out_file.write("diffuse", 1.0, 1.0, 1.0, 1.0)
 369                                         out_file.end()
 370                                         index = 0
 371                                         for u in mesh.uv_layers:
 372                                                 if u.name=="material_tex":
 373                                                         index = u.unit
 374                                         out_file.begin("texunit", index)
 375                                         out_file.begin("texture2d")
 376                                         out_file.write("min_filter", "NEAREST")
 377                                         out_file.write("mag_filter", "NEAREST")
 378                                         out_file.write("storage", "RGB", len(mesh.materials), 1)
 379                                         texdata = '"'
 380                                         for m in mesh.materials:
 381                                                 color = [int(c*255) for c in m.diffuse_color]
 382                                                 texdata += "\\x%02X\\x%02X\\x%02X"%tuple(color)
 383                                         texdata += '"'
 384                                         out_file.write("raw_data", texdata)
 385                                         out_file.end()
 386                                         out_file.end()
 387                                 else:
 388                                         mat = mesh.materials[0]
 389                                         out_file.begin("material")
 390                                         diff = mat.diffuse_color
 391                                         out_file.write("diffuse", diff.r, diff.g, diff.b, 1.0)
 392                                         amb = diff*mat.ambient
 393                                         out_file.write("ambient", amb.r, amb.g, amb.b, 1.0)
 394                                         spec = mat.specular_color*mat.specular_intensity
 395                                         out_file.write("specular", spec.r, spec.g, spec.b, 1.0)
 396                                         out_file.write("shininess", mat.specular_hardness);
 397                                         out_file.end()
 398
 399                                 if self.textures!="NONE":
 400                                         for slot in mesh.materials[0].texture_slots:
 401                                                 if not slot:
 402                                                         continue
 403
 404                                                 tex = slot.texture
 405                                                 if tex.type!="IMAGE":
 406                                                         continue
 407
 408                                                 if slot.uv_layer:
 409                                                         for u in mesh.uv_layers:
 410                                                                 if u.name==slot.uv_layer:
 411                                                                         index = u.unit
 412                                                 else:
 413                                                         index = mesh.uv_layers[0].unit
 414
 415                                                 out_file.begin("texunit", index)
 416                                                 if self.textures=="INLINE":
 417                                                         out_file.begin("texture2d")
 418                                                         out_file.write("min_filter", "LINEAR")
 419                                                         out_file.write("storage", "RGBA", tex.image.size[0], tex.image.size[1])
 420                                                         texdata = '"'
 421                                                         for p in tex.image.pixels:
 422                                                                 texdata += "\\x%02X"%int(p*255)
 423                                                         texdata += '"'
 424                                                         out_file.write("raw_data", texdata)
 425                                                         out_file.end()
 426                                                 else:
 427                                                         out_file.write("texture", '"%s"'%tex.image.name)
 428                                                 out_file.end()
 429
 430                         out_file.end()
 431                         out_file.end()
 432
 433                 progress.set_task("Done", 1.0, 1.0)
 434
 435                 for m in bmeshes:
 436                         bpy.data.meshes.remove(m)