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Merge pull request #633 from heandreas/master 

Multiple meshes in single STL ascii file and binary bly exporter fix
pull/635/head
Kim Kulling 2015-08-13 15:13:09 +02:00
parent 4cc67a3ccc bcf3f985fb
commit 2a432f9adc
2 changed files with 184 additions and 143 deletions
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23
code/PlyExporter.cpp
View File

@ -189,7 +189,12 @@ PlyExporter::PlyExporter(const char* _filename, const aiScene* pScene, bool bina
}
mOutput << "element face " << faces << endl;
mOutput << "property list uint uint vertex_index" << endl;
// uchar seems to be the most common type for the number of indices per polygon and int seems to be most common for the vertex indices.
// For instance, MeshLab fails to load meshes in which both types are uint. Houdini seems to have problems as well.
// Obviously, using uchar will not work for meshes with polygons with more than 255 indices, but how realistic is this case?
mOutput << "property list uchar int vertex_index" << endl;
mOutput << "end_header" << endl;
for (unsigned int i = 0; i < pScene->mNumMeshes; ++i) {
@ -342,16 +347,24 @@ void PlyExporter::WriteMeshIndices(const aiMesh* m, unsigned int offset)
}
}
void PlyExporter::WriteMeshIndicesBinary(const aiMesh* m, unsigned int offset)
// Generic method in case we want to use different data types for the indices or make this configurable.
template<typename NumIndicesType, typename IndexType>
void WriteMeshIndicesBinary_Generic(const aiMesh* m, unsigned int offset, std::ostringstream& output)
{
for (unsigned int i = 0; i < m->mNumFaces; ++i) {
const aiFace& f = m->mFaces[i];
mOutput.write(reinterpret_cast<const char*>(&f.mNumIndices), 4);
NumIndicesType numIndices = static_cast<NumIndicesType>(f.mNumIndices);
output.write(reinterpret_cast<const char*>(&numIndices), sizeof(NumIndicesType));
for (unsigned int c = 0; c < f.mNumIndices; ++c) {
unsigned int index = f.mIndices[c] + offset;
mOutput.write(reinterpret_cast<const char*>(&index), 4);
IndexType index = f.mIndices[c] + offset;
output.write(reinterpret_cast<const char*>(&index), sizeof(IndexType));
}
}
}
void PlyExporter::WriteMeshIndicesBinary(const aiMesh* m, unsigned int offset)
{
WriteMeshIndicesBinary_Generic<unsigned char, int>(m, offset, mOutput);
}
#endif

150
code/STLLoader.cpp
View File

@ -154,6 +154,19 @@ const aiImporterDesc* STLImporter::GetInfo () const {
return &desc;
}
void addFacesToMesh(aiMesh* pMesh)
{
pMesh->mFaces = new aiFace[pMesh->mNumFaces];
for (unsigned int i = 0, p = 0; i < pMesh->mNumFaces;++i) {
aiFace& face = pMesh->mFaces[i];
face.mIndices = new unsigned int[face.mNumIndices = 3];
for (unsigned int o = 0; o < 3;++o,++p) {
face.mIndices[o] = p;
}
}
}
// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void STLImporter::InternReadFile( const std::string& pFile,
@ -179,17 +192,8 @@ void STLImporter::InternReadFile( const std::string& pFile,
// the default vertex color is light gray.
clrColorDefault.r = clrColorDefault.g = clrColorDefault.b = clrColorDefault.a = 0.6f;
// allocate one mesh
pScene->mNumMeshes = 1;
pScene->mMeshes = new aiMesh*[1];
aiMesh* pMesh = pScene->mMeshes[0] = new aiMesh();
pMesh->mMaterialIndex = 0;
// allocate a single node
pScene->mRootNode = new aiNode();
pScene->mRootNode->mNumMeshes = 1;
pScene->mRootNode->mMeshes = new unsigned int[1];
pScene->mRootNode->mMeshes[0] = 0;
bool bMatClr = false;
@ -201,16 +205,12 @@ void STLImporter::InternReadFile( const std::string& pFile,
throw DeadlyImportError( "Failed to determine STL storage representation for " + pFile + ".");
}
// now copy faces
pMesh->mFaces = new aiFace[pMesh->mNumFaces];
for (unsigned int i = 0, p = 0; i < pMesh->mNumFaces;++i) {
aiFace& face = pMesh->mFaces[i];
face.mIndices = new unsigned int[face.mNumIndices = 3];
for (unsigned int o = 0; o < 3;++o,++p) {
face.mIndices[o] = p;
}
}
// add all created meshes to the single node
pScene->mRootNode = new aiNode();
pScene->mRootNode->mNumMeshes = pScene->mNumMeshes;
pScene->mRootNode->mMeshes = new unsigned int[pScene->mNumMeshes];
for (unsigned int i = 0; i < pScene->mNumMeshes; i++)
pScene->mRootNode->mMeshes[i] = i;
// create a single default material, using a light gray diffuse color for consistency with
// other geometric types (e.g., PLY).
@ -236,9 +236,24 @@ void STLImporter::InternReadFile( const std::string& pFile,
// Read an ASCII STL file
void STLImporter::LoadASCIIFile()
{
aiMesh* pMesh = pScene->mMeshes[0];
std::vector<aiMesh*> meshes;
const char* sz = mBuffer;
const char* bufferEnd = mBuffer + fileSize;
std::vector<aiVector3D> positionBuffer;
std::vector<aiVector3D> normalBuffer;
// try to guess how many vertices we could have
// assume we'll need 160 bytes for each face
size_t sizeEstimate = std::max(1u, fileSize / 160u ) * 3;
positionBuffer.reserve(sizeEstimate);
normalBuffer.reserve(sizeEstimate);
while (IsAsciiSTL(sz, bufferEnd - sz))
{
aiMesh* pMesh = new aiMesh();
pMesh->mMaterialIndex = 0;
meshes.push_back(pMesh);
SkipSpaces(&sz);
ai_assert(!IsLineEnd(sz));
@ -262,13 +277,7 @@ void STLImporter::LoadASCIIFile()
}
else pScene->mRootNode->mName.Set("<STL_ASCII>");
// try to guess how many vertices we could have
// assume we'll need 160 bytes for each face
pMesh->mNumVertices = ( pMesh->mNumFaces = std::max(1u,fileSize / 160u )) * 3;
pMesh->mVertices = new aiVector3D[pMesh->mNumVertices];
pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
unsigned int curFace = 0, curVertex = 3;
unsigned int faceVertexCounter = 0;
for ( ;; )
{
// go to the next token
@ -281,34 +290,14 @@ void STLImporter::LoadASCIIFile()
// facet normal -0.13 -0.13 -0.98
if (!strncmp(sz,"facet",5) && IsSpaceOrNewLine(*(sz+5)) && *(sz + 5) != '\0') {
if (3 != curVertex) {
if (faceVertexCounter != 3) {
DefaultLogger::get()->warn("STL: A new facet begins but the old is not yet complete");
}
if (pMesh->mNumFaces == curFace) {
ai_assert(pMesh->mNumFaces != 0);
// need to resize the arrays, our size estimate was wrong
unsigned int iNeededSize = (unsigned int)(sz-mBuffer) / pMesh->mNumFaces;
if (iNeededSize <= 160)iNeededSize >>= 1; // prevent endless looping
unsigned int add = (unsigned int)((mBuffer+fileSize)-sz) / iNeededSize;
add += add >> 3; // add 12.5% as buffer
iNeededSize = (pMesh->mNumFaces + add)*3;
aiVector3D* pv = new aiVector3D[iNeededSize];
memcpy(pv,pMesh->mVertices,pMesh->mNumVertices*sizeof(aiVector3D));
delete[] pMesh->mVertices;
pMesh->mVertices = pv;
pv = new aiVector3D[iNeededSize];
memcpy(pv,pMesh->mNormals,pMesh->mNumVertices*sizeof(aiVector3D));
delete[] pMesh->mNormals;
pMesh->mNormals = pv;
pMesh->mNumVertices = iNeededSize;
pMesh->mNumFaces += add;
}
aiVector3D* vn = &pMesh->mNormals[curFace++*3];
faceVertexCounter = 0;
normalBuffer.push_back(aiVector3D());
aiVector3D* vn = &normalBuffer.back();
sz += 6;
curVertex = 0;
SkipSpaces(&sz);
if (strncmp(sz,"normal",6)) {
DefaultLogger::get()->warn("STL: a facet normal vector was expected but not found");
@ -322,14 +311,14 @@ void STLImporter::LoadASCIIFile()
sz = fast_atoreal_move<float>(sz, (float&)vn->y );
SkipSpaces(&sz);
sz = fast_atoreal_move<float>(sz, (float&)vn->z );
*(vn+1) = *vn;
*(vn+2) = *vn;
normalBuffer.push_back(*vn);
normalBuffer.push_back(*vn);
}
}
// vertex 1.50000 1.50000 0.00000
else if (!strncmp(sz,"vertex",6) && ::IsSpaceOrNewLine(*(sz+6)))
{
if (3 == curVertex) {
if (faceVertexCounter >= 3) {
DefaultLogger::get()->error("STL: a facet with more than 3 vertices has been found");
++sz;
}
@ -337,15 +326,21 @@ void STLImporter::LoadASCIIFile()
{
sz += 7;
SkipSpaces(&sz);
aiVector3D* vn = &pMesh->mVertices[(curFace-1)*3 + curVertex++];
positionBuffer.push_back(aiVector3D());
aiVector3D* vn = &positionBuffer.back();
sz = fast_atoreal_move<float>(sz, (float&)vn->x );
SkipSpaces(&sz);
sz = fast_atoreal_move<float>(sz, (float&)vn->y );
SkipSpaces(&sz);
sz = fast_atoreal_move<float>(sz, (float&)vn->z );
faceVertexCounter++;
}
}
else if (!::strncmp(sz,"endsolid",8)) {
do {
++sz;
} while (!::IsLineEnd(*sz));
SkipSpacesAndLineEnd(&sz);
// finished!
break;
}
@ -357,19 +352,49 @@ void STLImporter::LoadASCIIFile()
}
}
if (!curFace) {
if (positionBuffer.empty()) {
pMesh->mNumFaces = 0;
throw DeadlyImportError("STL: ASCII file is empty or invalid; no data loaded");
}
pMesh->mNumFaces = curFace;
pMesh->mNumVertices = curFace*3;
// we are finished!
if (positionBuffer.size() % 3 != 0) {
pMesh->mNumFaces = 0;
throw DeadlyImportError("STL: Invalid number of vertices");
}
if (normalBuffer.size() != positionBuffer.size()) {
pMesh->mNumFaces = 0;
throw DeadlyImportError("Normal buffer size does not match position buffer size");
}
pMesh->mNumFaces = positionBuffer.size() / 3;
pMesh->mNumVertices = positionBuffer.size();
pMesh->mVertices = new aiVector3D[pMesh->mNumVertices];
memcpy(pMesh->mVertices, &positionBuffer[0].x, pMesh->mNumVertices * sizeof(aiVector3D));
positionBuffer.clear();
pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
memcpy(pMesh->mNormals, &normalBuffer[0].x, pMesh->mNumVertices * sizeof(aiVector3D));
normalBuffer.clear();
// now copy faces
addFacesToMesh(pMesh);
}
// now add the loaded meshes
pScene->mNumMeshes = (unsigned int)meshes.size();
pScene->mMeshes = new aiMesh*[pScene->mNumMeshes];
for (size_t i = 0; i < meshes.size(); i++)
{
pScene->mMeshes[i] = meshes[i];
}
}
// ------------------------------------------------------------------------------------------------
// Read a binary STL file
bool STLImporter::LoadBinaryFile()
{
// allocate one mesh
pScene->mNumMeshes = 1;
pScene->mMeshes = new aiMesh*[1];
aiMesh* pMesh = pScene->mMeshes[0] = new aiMesh();
pMesh->mMaterialIndex = 0;
// skip the first 80 bytes
if (fileSize < 84) {
throw DeadlyImportError("STL: file is too small for the header");
@ -397,7 +422,6 @@ bool STLImporter::LoadBinaryFile()
const unsigned char* sz = (const unsigned char*)mBuffer + 80;
// now read the number of facets
aiMesh* pMesh = pScene->mMeshes[0];
pScene->mRootNode->mName.Set("<STL_BINARY>");
pMesh->mNumFaces = *((uint32_t*)sz);
@ -470,6 +494,10 @@ bool STLImporter::LoadBinaryFile()
*(clr+2) = *clr;
}
}
// now copy faces
addFacesToMesh(pMesh);
if (bIsMaterialise && !pMesh->mColors[0])
{
// use the color as diffuse material color