blender/io_mesh_mspgl/export_mspgl.py

   1 # $Id: mesh_export.py 137 2010-12-05 19:22:35Z tdb $
   2
   3 import bpy
   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 OutFile:
  37         def __init__(self, fn):
  38                 if fn==None:
  39                         self.file = sys.stdout
  40                 else:
  41                         self.file = open(fn, "w")
  42                 self.indent = 0
  43
  44         def make(self, kwd, *params):
  45                 pstr = ""
  46                 for p in params:
  47                         if type(p)==float:
  48                                 pstr += " %.6g"%p
  49                         else:
  50                                 pstr += " %s"%p
  51                 return "%s%s"%(kwd, pstr)
  52
  53         def write(self, kwd, *params):
  54                 self.file.write("%s%s;\n"%('\t'*self.indent, self.make(kwd, *params)))
  55
  56         def begin(self, kwd, *params):
  57                 i = '\t'*self.indent
  58                 self.file.write("%s%s\n%s{\n"%(i, self.make(kwd, *params), i))
  59                 self.indent += 1
  60
  61         def end(self):
  62                 self.indent -= 1
  63                 self.file.write("%s};\n"%('\t'*self.indent))
  64
  65
  66 class Exporter:
  67         def __init__(self):
  68                 self.use_strips = True
  69                 self.use_degen_tris = True
  70                 self.max_strip_len = 1024
  71                 self.optimize_cache = False
  72                 self.cache_size = 64
  73                 self.export_lines = True
  74                 self.export_uv = "UNIT0"
  75                 self.tbn_vecs = False
  76                 self.tbn_uvtex = ""
  77                 self.compound = False
  78                 self.object = False
  79                 self.material_tex = False
  80                 self.smoothing = "MSPGL"
  81
  82         def stripify(self, mesh, progress = None):
  83                 for f in mesh.faces:
  84                         f.flag = False
  85
  86                 faces_done = 0
  87                 strips = []
  88                 loose = []
  89
  90                 cache = None
  91                 if self.optimize_cache:
  92                         cache = VertexCache(self.cache_size)
  93
  94                 island = []
  95                 island_strips = []
  96                 while 1:
  97                         if not island:
  98                                 queue = []
  99                                 for f in mesh.faces:
 100                                         if not f.flag:
 101                                                 f.flag = True
 102                                                 queue.append(f)
 103                                                 break
 104
 105                                 if not queue:
 106                                         break
 107
 108                                 while queue:
 109                                         f = queue[0]
 110                                         del queue[0]
 111                                         island.append(f)
 112
 113                                         for e in f.edges:
 114                                                 other = e.other_face(f)
 115                                                 if other and not other.flag:
 116                                                         other.flag = True
 117                                                         queue.append(other)
 118
 119                                 for f in island:
 120                                         f.flag = False
 121
 122                         best = 5
 123                         face = None
 124                         for f in island:
 125                                 if f.flag:
 126                                         continue
 127                                 score = 0
 128                                 for e in f.edges:
 129                                         other = e.other_face(f)
 130                                         if other and not other.flag:
 131                                                 score += 1
 132                                 if score>0 and score<best:
 133                                         face = f
 134                                         best = score
 135
 136                         if not face:
 137                                 while island_strips:
 138                                         best = 0
 139                                         if cache:
 140                                                 best_hits = 0
 141                                                 for i in range(len(island_strips)):
 142                                                         hits = cache.test_strip(island_strips[i])
 143                                                         if hits>best_hits:
 144                                                                 best = i
 145                                                                 best_hits = hits
 146
 147                                         s = island_strips[best]
 148                                         del island_strips[best]
 149                                         strips.append(s)
 150
 151                                         if cache:
 152                                                 cache.fetch_strip(s)
 153
 154                                 faces_done += len(island)
 155                                 if progress:
 156                                         progress.set_progress(float(faces_done)/len(mesh.faces))
 157
 158                                 loose += [f for f in island if not f.flag]
 159                                 for f in island:
 160                                         f.flag = True
 161
 162                                 island = []
 163                                 island_strips = []
 164                                 continue
 165
 166                         strip = mesh.create_strip(face, self.max_strip_len)
 167                         if strip:
 168                                 island_strips.append(strip)
 169
 170                 if cache:
 171                         cache = VertexCache(self.cache_size)
 172                         total_hits = 0
 173
 174                 if self.use_degen_tris and strips:
 175                         big_strip = []
 176
 177                         for s in strips:
 178                                 if big_strip:
 179                                         glue = [big_strip[-1], s[0]]
 180                                         if len(big_strip)%2:
 181                                                 glue += [s[0]]
 182
 183                                         big_strip += glue
 184                                         if cache:
 185                                                 total_hits += cache.fetch_strip(glue)
 186
 187                                 big_strip += s
 188                                 if cache:
 189                                         total_hits += cache.fetch_strip(s)
 190
 191                         for f in loose:
 192                                 if len(big_strip)%2:
 193                                         order = (-1, -2, 0, 1)
 194                                 else:
 195                                         order = (0, 1, -1, -2)
 196                                 vertices = [f.vertices[i] for i in order[:len(f.vertices)]]
 197
 198                                 if big_strip:
 199                                         glue = [big_strip[-1], vertices[0]]
 200                                         big_strip += glue
 201                                         if cache:
 202                                                 total_hits += cache.fetch_strip(glue)
 203
 204                                 big_strip += vertices
 205                                 if cache:
 206                                         total_hits += cache.fetch_strip(vertices)
 207
 208                         strips = [big_strip]
 209                         loose = []
 210
 211                 return strips, loose
 212
 213         def export(self, context, fn):
 214                 if self.compound:
 215                         objs = context.selected_objects
 216                 else:
 217                         objs = [context.active_object]
 218
 219                 if not objs:
 220                         raise Exception("Nothing to export")
 221                 for o in objs:
 222                         if o.type!="MESH":
 223                                 raise Exception("Can only export Mesh data")
 224
 225                 from .mesh import Mesh
 226                 from .util import Progress
 227
 228                 progress = Progress()
 229                 progress.set_task("Preparing", 0.0, 0.0)
 230
 231                 mesh = None
 232                 bmeshes = []
 233                 for o in objs:
 234                         bmesh = o.create_mesh(context.scene, True, "PREVIEW")
 235                         bmeshes.append(bmesh)
 236                         if not mesh:
 237                                 mesh = Mesh(bmesh)
 238                         else:
 239                                 mesh.splice(Mesh(bmesh))
 240
 241                 progress.set_task("Smoothing", 0.05, 0.35)
 242                 if self.smoothing=="NONE":
 243                         mesh.flatten_faces()
 244                 mesh.split_smooth(progress)
 245
 246                 if self.smoothing!="BLENDER":
 247                         mesh.compute_normals()
 248
 249                 if self.material_tex:
 250                         mesh.generate_material_uv()
 251
 252                 texunits = []
 253                 if mesh.uv_textures and self.export_uv!="NONE":
 254                         if self.export_uv=="UNIT0":
 255                                 texunits = [0]
 256                         else:
 257                                 texunits = list(range(len(mesh.uv_textures)))
 258
 259                         for i in texunits:
 260                                 progress.set_task("Splitting UVs", 0.35+0.3*i/len(texunits), 0.35+0.3*(i+1)/len(texunits))
 261                                 mesh.split_uv(i, progress)
 262
 263                         mesh.compute_uv()
 264                         if self.tbn_vecs:
 265                                 mesh.compute_tbn(self.tbn_uvtex)
 266
 267                 strips = []
 268                 loose = mesh.faces
 269                 if self.use_strips:
 270                         progress.set_task("Creating strips", 0.65, 0.95)
 271                         strips, loose = self.stripify(mesh, progress)
 272
 273                 progress.set_task("Writing file", 0.95, 1.0)
 274
 275                 out_file = OutFile(fn)
 276                 if self.object:
 277                         out_file.begin("mesh")
 278
 279                 fmt = "NORMAL3"
 280                 if texunits:
 281                         fmt += "_TEXCOORD2"
 282                         for i in texunits[1:]:
 283                                 fmt += "_TEXCOORD2%d"%i
 284                         if self.tbn_vecs:
 285                                 fmt += "_ATTRIB33_ATTRIB34"
 286                 fmt += "_VERTEX3"
 287                 out_file.begin("vertices", fmt)
 288                 normal = None
 289                 uvs = [None]*len(mesh.uv_textures)
 290                 tan = None
 291                 bino = None
 292                 for v in mesh.vertices:
 293                         if v.normal!=normal:
 294                                 out_file.write("normal3", *v.normal)
 295                                 normal = v.normal
 296                         for i in texunits:
 297                                 if v.uvs[i]!=uvs[i]:
 298                                         if i==0:
 299                                                 out_file.write("texcoord2", *v.uvs[i])
 300                                         else:
 301                                                 out_file.write("multitexcoord2", i, *v.uvs[i])
 302                                         uvs[i] = v.uvs[i]
 303                         if v.tan!=tan:
 304                                 out_file.write("attrib3", 3, *v.tan)
 305                                 tan = v.tan
 306                         if v.bino!=bino:
 307                                 out_file.write("attrib3", 4, *v.bino)
 308                                 bino = v.bino
 309                         out_file.write("vertex3", *v.co)
 310                 out_file.end()
 311                 for s in strips:
 312                         out_file.begin("batch", "TRIANGLE_STRIP")
 313                         indices = []
 314                         n = 0
 315                         for v in s:
 316                                 indices.append(v.index)
 317                                 if len(indices)>=32:
 318                                         out_file.write("indices", *indices)
 319                                         indices = []
 320                         if indices:
 321                                 out_file.write("indices", *indices)
 322                         out_file.end()
 323
 324                 if loose:
 325                         out_file.begin("batch", "TRIANGLES")
 326                         for f in loose:
 327                                 for i in range(2, len(f.vertices)):
 328                                         out_file.write("indices", f.vertices[0].index, f.vertices[i-1].index, f.vertices[i].index)
 329                         out_file.end()
 330
 331                 if self.export_lines and mesh.lines:
 332                         out_file.write("batch", "LINES")
 333                         for l in mesh.lines:
 334                                 out_file.write("indices", l.vertices[0].index, l.vertices[1].index)
 335                         out_file.end()
 336
 337                 if self.object:
 338                         out_file.end()
 339                         out_file.begin("technique")
 340                         out_file.begin("pass", '""')
 341                         if self.material_tex:
 342                                 out_file.begin("material")
 343                                 out_file.write("diffuse", 1.0, 1.0, 1.0, 1.0)
 344                                 out_file.end()
 345                                 out_file.begin("texunit", 0)
 346                                 out_file.begin("texture2d")
 347                                 out_file.write("min_filter", "NEAREST")
 348                                 out_file.write("mag_filter", "NEAREST")
 349                                 out_file.write("storage", "RGB", len(mesh.materials), 1)
 350                                 texdata = '"'
 351                                 for m in mesh.materials:
 352                                         color = [int(c*255) for c in m.diffuse_color]
 353                                         texdata += "\\x%02X\\x%02X\\x%02X"%tuple(color)
 354                                 texdata += '"'
 355                                 out_file.write("raw_data", texdata)
 356                                 out_file.end()
 357                                 out_file.end()
 358                         elif mesh.materials:
 359                                 m = mesh.materials[0]
 360                                 out_file.begin("material")
 361                                 out_file.write("diffuse", m.R, m.G, m.B, 1.0)
 362                                 out_file.write("ambient", m.R*m.amb, m.G*m.amb, m.B*m.amb, 1.0)
 363                                 out_file.write("specular", m.specR*m.spec, m.specG*m.spec, m.specB*m.spec, 1.0)
 364                                 out_file.write("shininess", m.hard);
 365                                 out_file.end()
 366                         out_file.end()
 367                         out_file.end()
 368
 369                 progress.set_task("Done", 1.0, 1.0)
 370
 371                 for m in bmeshes:
 372                         bpy.data.meshes.remove(m)