vrshoot: 334d17aed7de libs/assimp/OgreMesh.cpp

vrshoot

view libs/assimp/OgreMesh.cpp @ 2:334d17aed7de

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author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 02 Feb 2014 18:36:38 +0200
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2 Open Asset Import Library (assimp)

3 ----------------------------------------------------------------------

5 Copyright (c) 2006-2012, assimp team

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38 ----------------------------------------------------------------------

41 #include "AssimpPCH.h"

43 #ifndef ASSIMP_BUILD_NO_OGRE_IMPORTER

45 #include "OgreImporter.hpp"

46 #include "TinyFormatter.h"

48 using namespace std;

50 namespace Assimp

52 namespace Ogre

56 void OgreImporter::ReadSubMesh(SubMesh &theSubMesh, XmlReader *Reader)

58 if(Reader->getAttributeValue("usesharedvertices"))

59 theSubMesh.SharedData=GetAttribute<bool>(Reader, "usesharedvertices");

61 XmlRead(Reader);

62 //TODO: maybe we have alsways just 1 faces and 1 geometry and always in this order. this loop will only work correct, when the order

63 //of faces and geometry changed, and not if we have more than one of one

64 while( Reader->getNodeName()==string("faces")

65 || Reader->getNodeName()==string("geometry")

66 || Reader->getNodeName()==string("boneassignments"))

68 if(string(Reader->getNodeName())=="faces")//Read the face list

70 //some info logging:

71 unsigned int NumFaces=GetAttribute<int>(Reader, "count");

72 ostringstream ss; ss <<"Submesh has " << NumFaces << " Faces.";

73 DefaultLogger::get()->debug(ss.str());

75 while(XmlRead(Reader) && Reader->getNodeName()==string("face"))

76 {

77 Face NewFace;

78 NewFace.VertexIndices[0]=GetAttribute<int>(Reader, "v1");

79 NewFace.VertexIndices[1]=GetAttribute<int>(Reader, "v2");

80 NewFace.VertexIndices[2]=GetAttribute<int>(Reader, "v3");

81 if(Reader->getAttributeValue("v4"))//this should be supported in the future

82 {

83 DefaultLogger::get()->warn("Submesh has quads, only traingles are supported!");

84 //throw DeadlyImportError("Submesh has quads, only traingles are supported!");

85 }

86 theSubMesh.FaceList.push_back(NewFace);

87 }

89 }//end of faces

90 else if(string(Reader->getNodeName())=="geometry")//Read the vertexdata

91 {

92 //some info logging:

93 unsigned int NumVertices=GetAttribute<int>(Reader, "vertexcount");

94 ostringstream ss; ss<<"VertexCount: " << NumVertices;

95 DefaultLogger::get()->debug(ss.str());

97 //General Informations about vertices

98 XmlRead(Reader);

99 while(Reader->getNodeName()==string("vertexbuffer"))

100 {

101 ReadVertexBuffer(theSubMesh, Reader, NumVertices);

102 }

104 //some error checking on the loaded data

105 if(!theSubMesh.HasPositions)

106 throw DeadlyImportError("No positions could be loaded!");

108 if(theSubMesh.HasNormals && theSubMesh.Normals.size() != NumVertices)

109 throw DeadlyImportError("Wrong Number of Normals loaded!");

111 if(theSubMesh.HasTangents && theSubMesh.Tangents.size() != NumVertices)

112 throw DeadlyImportError("Wrong Number of Tangents loaded!");

114 for(unsigned int i=0; i<theSubMesh.Uvs.size(); ++i)

115 {

116 if(theSubMesh.Uvs[i].size() != NumVertices)

117 throw DeadlyImportError("Wrong Number of Uvs loaded!");

118 }

120 }//end of "geometry

123 else if(Reader->getNodeName()==string("boneassignments"))

125 ReadBoneWeights(theSubMesh, Reader);

128 DefaultLogger::get()->debug((Formatter::format(),

129 "Positionen: ",theSubMesh.Positions.size(),

130 " Normale: ",theSubMesh.Normals.size(),

131 " TexCoords: ",theSubMesh.Uvs.size(),

132 " Tantents: ",theSubMesh.Tangents.size()

133 ));

137 void OgreImporter::ReadVertexBuffer(SubMesh &theSubMesh, XmlReader *Reader, unsigned int NumVertices)

139 DefaultLogger::get()->debug("new Vertex Buffer");

141 bool ReadPositions=false;

142 bool ReadNormals=false;

143 bool ReadTangents=false;

144 unsigned int NumUvs=0;

146 //-------------------- check, what we need to read: --------------------------------

147 if(Reader->getAttributeValue("positions") && GetAttribute<bool>(Reader, "positions"))

149 ReadPositions=theSubMesh.HasPositions=true;

150 theSubMesh.Positions.reserve(NumVertices);

151 DefaultLogger::get()->debug("reading positions");

153 if(Reader->getAttributeValue("normals") && GetAttribute<bool>(Reader, "normals"))

155 ReadNormals=theSubMesh.HasNormals=true;

156 theSubMesh.Normals.reserve(NumVertices);

157 DefaultLogger::get()->debug("reading normals");

159 if(Reader->getAttributeValue("tangents") && GetAttribute<bool>(Reader, "tangents"))

161 ReadTangents=theSubMesh.HasTangents=true;

162 theSubMesh.Tangents.reserve(NumVertices);

163 DefaultLogger::get()->debug("reading tangents");

166 if(Reader->getAttributeValue("texture_coords"))

168 NumUvs=GetAttribute<unsigned int>(Reader, "texture_coords");

169 theSubMesh.Uvs.resize(NumUvs);

170 for(unsigned int i=0; i<theSubMesh.Uvs.size(); ++i) theSubMesh.Uvs[i].reserve(NumVertices);

171 DefaultLogger::get()->debug("reading texture coords");

173 //___________________________________________________________________

176 //check if we will load anything

177 if(!( ReadPositions || ReadNormals || ReadTangents || (NumUvs>0) ))

178 DefaultLogger::get()->warn("vertexbuffer seams to be empty!");

181 //read all the vertices:

182 XmlRead(Reader);

184 /*it might happen, that we have more than one attribute per vertex (they are not splitted to different buffers)

185 so the break condition is a bit tricky */

186 while(Reader->getNodeName()==string("vertex")

187 ||Reader->getNodeName()==string("position")

188 ||Reader->getNodeName()==string("normal")

189 ||Reader->getNodeName()==string("tangent")

190 ||Reader->getNodeName()==string("texcoord")

191 ||Reader->getNodeName()==string("colour_diffuse"))

193 if(Reader->getNodeName()==string("vertex"))

194 XmlRead(Reader);//Read an attribute tag

196 //Position

197 if(ReadPositions && Reader->getNodeName()==string("position"))

199 aiVector3D NewPos;

200 NewPos.x=GetAttribute<float>(Reader, "x");

201 NewPos.y=GetAttribute<float>(Reader, "y");

202 NewPos.z=GetAttribute<float>(Reader, "z");

203 theSubMesh.Positions.push_back(NewPos);

205

206 //Normal

207 else if(ReadNormals && Reader->getNodeName()==string("normal"))

209 aiVector3D NewNormal;

210 NewNormal.x=GetAttribute<float>(Reader, "x");

211 NewNormal.y=GetAttribute<float>(Reader, "y");

212 NewNormal.z=GetAttribute<float>(Reader, "z");

213 theSubMesh.Normals.push_back(NewNormal);

215

216 //Tangent

217 else if(ReadTangents && Reader->getNodeName()==string("tangent"))

219 aiVector3D NewTangent;

220 NewTangent.x=GetAttribute<float>(Reader, "x");

221 NewTangent.y=GetAttribute<float>(Reader, "y");

222 NewTangent.z=GetAttribute<float>(Reader, "z");

223 theSubMesh.Tangents.push_back(NewTangent);

226 //Uv:

227 else if(NumUvs>0 && Reader->getNodeName()==string("texcoord"))

229 for(unsigned int i=0; i<NumUvs; ++i)

230 {

231 if(Reader->getNodeName()!=string("texcoord"))

232 {

233 DefaultLogger::get()->warn(string("Not enough UVs in Vertex: ")+Reader->getNodeName());

234 }

235 aiVector3D NewUv;

236 NewUv.x=GetAttribute<float>(Reader, "u");

237 NewUv.y=GetAttribute<float>(Reader, "v")*(-1)+1;//flip the uv vertikal, blender exports them so!

238 theSubMesh.Uvs[i].push_back(NewUv);

239 XmlRead(Reader);

240 }

241 continue;//because we already read the next node...

244 //Color:

245 //TODO: actually save this data!

246 else if(Reader->getNodeName()==string("colour_diffuse"))

248 //do nothing, because we not yet support them

251 //Attribute could not be read

252 else

254 DefaultLogger::get()->warn(string("Attribute was not read: ")+Reader->getNodeName());

257 XmlRead(Reader);//Read the Vertex tag

262 void OgreImporter::ReadBoneWeights(SubMesh &theSubMesh, XmlReader *Reader)

264 theSubMesh.Weights.resize(theSubMesh.Positions.size());

265 while(XmlRead(Reader) && Reader->getNodeName()==string("vertexboneassignment"))

267 Weight NewWeight;

268 unsigned int VertexId=GetAttribute<int>(Reader, "vertexindex");

269 NewWeight.BoneId=GetAttribute<int>(Reader, "boneindex");

270 NewWeight.Value=GetAttribute<float>(Reader, "weight");

271 //calculate the number of bones used (this is the highest id +1 becuase bone ids start at 0)

272 theSubMesh.BonesUsed=max(theSubMesh.BonesUsed, NewWeight.BoneId+1);

274 theSubMesh.Weights[VertexId].push_back(NewWeight);

280 void OgreImporter::ProcessSubMesh(SubMesh &theSubMesh, SubMesh &theSharedGeometry)

282 //---------------Make all Vertexes unique: (this is required by assimp)-----------------------

283 vector<Face> UniqueFaceList(theSubMesh.FaceList.size());

284 unsigned int UniqueVertexCount=theSubMesh.FaceList.size()*3;//*3 because each face consists of 3 vertexes, because we only support triangles^^

286 vector<aiVector3D> UniquePositions(UniqueVertexCount);

288 vector<aiVector3D> UniqueNormals(UniqueVertexCount);

290 vector<aiVector3D> UniqueTangents(UniqueVertexCount);

292 vector< vector<Weight> > UniqueWeights(UniqueVertexCount);

294 vector< vector<aiVector3D> > UniqueUvs(theSubMesh.Uvs.size());

295 for(unsigned int i=0; i<UniqueUvs.size(); ++i) UniqueUvs[i].resize(UniqueVertexCount);

299 //Support for shared data:

300 /*We can use this loop to copy vertex informations from the shared data pool. In order to do so

301 we just use a reference to a submodel instead of our submodel itself*/

303 SubMesh& VertexSource= theSubMesh.SharedData ? theSharedGeometry : theSubMesh;

304 if(theSubMesh.SharedData)//copy vertexinformations to our mesh:

306 theSubMesh.HasPositions=theSharedGeometry.HasPositions;

307 theSubMesh.HasNormals=theSharedGeometry.HasNormals;

308 theSubMesh.HasTangents=theSharedGeometry.HasTangents;

310 theSubMesh.BonesUsed=theSharedGeometry.BonesUsed;

312 UniqueUvs.resize(theSharedGeometry.Uvs.size());

313 for(unsigned int i=0; i<UniqueUvs.size(); ++i) UniqueUvs[i].resize(UniqueVertexCount);

316 for(unsigned int i=0; i<theSubMesh.FaceList.size(); ++i)

318 //We precalculate the index vlaues her, because we need them in all vertex attributes

319 unsigned int Vertex1=theSubMesh.FaceList[i].VertexIndices[0];

320 unsigned int Vertex2=theSubMesh.FaceList[i].VertexIndices[1];

321 unsigned int Vertex3=theSubMesh.FaceList[i].VertexIndices[2];

323 UniquePositions[3*i+0]=VertexSource.Positions[Vertex1];

324 UniquePositions[3*i+1]=VertexSource.Positions[Vertex2];

325 UniquePositions[3*i+2]=VertexSource.Positions[Vertex3];

327 if(VertexSource.HasNormals)

329 UniqueNormals[3*i+0]=VertexSource.Normals[Vertex1];

330 UniqueNormals[3*i+1]=VertexSource.Normals[Vertex2];

331 UniqueNormals[3*i+2]=VertexSource.Normals[Vertex3];

334 if(VertexSource.HasTangents)

336 UniqueTangents[3*i+0]=VertexSource.Tangents[Vertex1];

337 UniqueTangents[3*i+1]=VertexSource.Tangents[Vertex2];

338 UniqueTangents[3*i+2]=VertexSource.Tangents[Vertex3];

341 if(UniqueUvs.size()>0)

343 for(unsigned int j=0; j<UniqueUvs.size(); ++j)

344 {

345 UniqueUvs[j][3*i+0]=VertexSource.Uvs[j][Vertex1];

346 UniqueUvs[j][3*i+1]=VertexSource.Uvs[j][Vertex2];

347 UniqueUvs[j][3*i+2]=VertexSource.Uvs[j][Vertex3];

348 }

351 if(VertexSource.Weights.size() > 0)

353 UniqueWeights[3*i+0]=VertexSource.Weights[Vertex1];

354 UniqueWeights[3*i+1]=VertexSource.Weights[Vertex2];

355 UniqueWeights[3*i+2]=VertexSource.Weights[Vertex3];

358 //The indexvalues a just continuous numbers (0, 1, 2, 3, 4, 5, 6...)

359 UniqueFaceList[i].VertexIndices[0]=3*i+0;

360 UniqueFaceList[i].VertexIndices[1]=3*i+1;

361 UniqueFaceList[i].VertexIndices[2]=3*i+2;

363 //_________________________________________________________________________________________

365 //now we have the unique datas, but want them in the SubMesh, so we swap all the containers:

366 //if we don't have one of them, we just swap empty containers, so everything is ok

367 theSubMesh.FaceList.swap(UniqueFaceList);

368 theSubMesh.Positions.swap(UniquePositions);

369 theSubMesh.Normals.swap(UniqueNormals);

370 theSubMesh.Tangents.swap(UniqueTangents);

371 theSubMesh.Uvs.swap(UniqueUvs);

372 theSubMesh.Weights.swap(UniqueWeights);

376 //------------- normalize weights -----------------------------

377 //The Blender exporter doesn't care about whether the sum of all boneweights for a single vertex equals 1 or not,

378 //so we have to make this sure:

379 for(unsigned int VertexId=0; VertexId<theSubMesh.Weights.size(); ++VertexId)//iterate over all vertices

381 float WeightSum=0.0f;

382 for(unsigned int BoneId=0; BoneId<theSubMesh.Weights[VertexId].size(); ++BoneId)//iterate over all bones

384 WeightSum+=theSubMesh.Weights[VertexId][BoneId].Value;

387 //check if the sum is too far away from 1

388 if(WeightSum<1.0f-0.05f || WeightSum>1.0f+0.05f)

390 //normalize all weights:

391 for(unsigned int BoneId=0; BoneId<theSubMesh.Weights[VertexId].size(); ++BoneId)//iterate over all bones

392 {

393 theSubMesh.Weights[VertexId][BoneId].Value/=WeightSum;

394 }

397 //_________________________________________________________

403 aiMesh* OgreImporter::CreateAssimpSubMesh(const SubMesh& theSubMesh, const vector<Bone>& Bones) const

405 const aiScene* const m_CurrentScene=this->m_CurrentScene;//make sure, that we can access but not change the scene

406 (void)m_CurrentScene;

408 aiMesh* NewAiMesh=new aiMesh();

410 //Positions

411 NewAiMesh->mVertices=new aiVector3D[theSubMesh.Positions.size()];

412 memcpy(NewAiMesh->mVertices, &theSubMesh.Positions[0], theSubMesh.Positions.size()*sizeof(aiVector3D));

413 NewAiMesh->mNumVertices=theSubMesh.Positions.size();

415 //Normals

416 if(theSubMesh.HasNormals)

418 NewAiMesh->mNormals=new aiVector3D[theSubMesh.Normals.size()];

419 memcpy(NewAiMesh->mNormals, &theSubMesh.Normals[0], theSubMesh.Normals.size()*sizeof(aiVector3D));

423 //until we have support for bitangents, no tangents will be written

425 //Tangents

426 if(theSubMesh.HasTangents)

428 NewAiMesh->mTangents=new aiVector3D[theSubMesh.Tangents.size()];

429 memcpy(NewAiMesh->mTangents, &theSubMesh.Tangents[0], theSubMesh.Tangents.size()*sizeof(aiVector3D));

433 //Uvs

434 if(theSubMesh.Uvs.size()>0)

436 for(unsigned int i=0; i<theSubMesh.Uvs.size(); ++i)

438 NewAiMesh->mNumUVComponents[i]=2;

439 NewAiMesh->mTextureCoords[i]=new aiVector3D[theSubMesh.Uvs[i].size()];

440 memcpy(NewAiMesh->mTextureCoords[i], &(theSubMesh.Uvs[i][0]), theSubMesh.Uvs[i].size()*sizeof(aiVector3D));

445 //---------------------------------------- Bones --------------------------------------------

447 //Copy the weights in in Bone-Vertices Struktur

448 //(we have them in a Vertex-Bones Structur, this is much easier for making them unique, which is required by assimp

449 vector< vector<aiVertexWeight> > aiWeights(theSubMesh.BonesUsed);//now the outer list are the bones, and the inner vector the vertices

450 for(unsigned int VertexId=0; VertexId<theSubMesh.Weights.size(); ++VertexId)//iterate over all vertices

452 for(unsigned int BoneId=0; BoneId<theSubMesh.Weights[VertexId].size(); ++BoneId)//iterate over all bones

454 aiVertexWeight NewWeight;

455 NewWeight.mVertexId=VertexId;//the current Vertex, we can't use the Id form the submehs weights, because they are bone id's

456 NewWeight.mWeight=theSubMesh.Weights[VertexId][BoneId].Value;

457 aiWeights[theSubMesh.Weights[VertexId][BoneId].BoneId].push_back(NewWeight);

463 vector<aiBone*> aiBones;

464 aiBones.reserve(theSubMesh.BonesUsed);//the vector might be smaller, because there might be empty bones (bones that are not attached to any vertex)

466 //create all the bones and fill them with informations

467 for(unsigned int i=0; i<theSubMesh.BonesUsed; ++i)

469 if(aiWeights[i].size()>0)

471 aiBone* NewBone=new aiBone();

472 NewBone->mNumWeights=aiWeights[i].size();

473 NewBone->mWeights=new aiVertexWeight[aiWeights[i].size()];

474 memcpy(NewBone->mWeights, &(aiWeights[i][0]), sizeof(aiVertexWeight)*aiWeights[i].size());

475 NewBone->mName=Bones[i].Name;//The bone list should be sorted after its id's, this was done in LoadSkeleton

476 NewBone->mOffsetMatrix=Bones[i].BoneToWorldSpace;

477

478 aiBones.push_back(NewBone);

481 NewAiMesh->mNumBones=aiBones.size();

483 // mBones must be NULL if mNumBones is non 0 or the validation fails.

484 if (aiBones.size()) {

485 NewAiMesh->mBones=new aiBone* [aiBones.size()];

486 memcpy(NewAiMesh->mBones, &(aiBones[0]), aiBones.size()*sizeof(aiBone*));

489 //______________________________________________________________________________________________________

493 //Faces

494 NewAiMesh->mFaces=new aiFace[theSubMesh.FaceList.size()];

495 for(unsigned int i=0; i<theSubMesh.FaceList.size(); ++i)

497 NewAiMesh->mFaces[i].mNumIndices=3;

498 NewAiMesh->mFaces[i].mIndices=new unsigned int[3];

500 NewAiMesh->mFaces[i].mIndices[0]=theSubMesh.FaceList[i].VertexIndices[0];

501 NewAiMesh->mFaces[i].mIndices[1]=theSubMesh.FaceList[i].VertexIndices[1];

502 NewAiMesh->mFaces[i].mIndices[2]=theSubMesh.FaceList[i].VertexIndices[2];

504 NewAiMesh->mNumFaces=theSubMesh.FaceList.size();

506 //Link the material:

507 NewAiMesh->mMaterialIndex=theSubMesh.MaterialIndex;//the index is set by the function who called ReadSubMesh

509 return NewAiMesh;

513 }//namespace Ogre

514 }//namespace Assimp

516 #endif // !! ASSIMP_BUILD_NO_OGRE_IMPORTER