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Read the data type for #vertices/face from PLY header #15

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33 changes: 11 additions & 22 deletions include/core-mesh/meshIO.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -115,25 +115,22 @@ void MeshIO<FloatType>::loadFromPLY( const std::string& filename, MeshData<Float

delete [] data;

size = 1+3*4; //typically 1 uchar for numVertices per triangle, 3 * int for indices
// size of the #vertices/face field, uchar=1, int=4
// need to support int field, for eg. PLY files coming from PoissonRecon's SurfaceTrimmer.exe
unsigned int verticesPerFaceFieldSize = header.m_properties["verticesPerFace"][0].byteSize;
//typically 1 uchar for numVertices per triangle, 3 * int for indices
size = verticesPerFaceFieldSize + 3*4;
data = new char[size*header.m_numFaces];
file.read(data, size*header.m_numFaces);
for (unsigned int i = 0; i < header.m_numFaces; i++) {
mesh.m_FaceIndicesVertices[i][0] = ((int*)&data[i*size+1])[0];
mesh.m_FaceIndicesVertices[i][1] = ((int*)&data[i*size+1])[1];
mesh.m_FaceIndicesVertices[i][2] = ((int*)&data[i*size+1])[2];

//mesh.m_FaceIndicesVertices[i].push_back(((int*)&data[i*size+1])[0]);
//mesh.m_FaceIndicesVertices[i].push_back(((int*)&data[i*size+1])[1]);
//mesh.m_FaceIndicesVertices[i].push_back(((int*)&data[i*size+1])[2]);
for (unsigned int i = 0; i < header.m_numFaces; i++) {
// go to the line containing i'th face, then skip the first field (#vertices/face)
unsigned int offset = i * size + verticesPerFaceFieldSize;
mesh.m_FaceIndicesVertices[i][0] = ((int*)&data[offset])[0];
mesh.m_FaceIndicesVertices[i][1] = ((int*)&data[offset])[1];
mesh.m_FaceIndicesVertices[i][2] = ((int*)&data[offset])[2];
}

//if (mesh.m_Colors.size() == 0) {
// mesh.m_Colors.resize(header.m_NumVertices);
// for (size_t i = 0; i < mesh.m_Colors.size(); i++) {
// mesh.m_Colors[i] = vec3f(0.5f, 0.5f, 0.5f);
// }
//}
delete [] data;

}
Expand Down Expand Up @@ -164,14 +161,6 @@ void MeshIO<FloatType>::loadFromPLY( const std::string& filename, MeshData<Float
}
mesh.m_FaceIndicesVertices.push_back(face);
}

//if (mesh.m_Colors.size() == 0) {
// mesh.m_Colors.resize(header.m_NumVertices);
// for (size_t i = 0; i < mesh.m_Colors.size(); i++) {
// mesh.m_Colors[i] = vec3f(0.5f, 0.5f, 0.5f);
// }
//}

}
}

Expand Down
40 changes: 33 additions & 7 deletions include/core-mesh/plyHeader.h
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Expand Up @@ -44,6 +44,23 @@ namespace ml {
}
}

static unsigned int getByteSizeFromNameType(const std::string& nameType) {
/*
nameType: double/float/int/uint/char/uchar/short/ushort
return: number of bytes occupied by this type
*/
unsigned int size;

if (nameType == "double") size = 8;
else if (nameType == "float" || nameType == "int" || nameType == "uint") size = 4;
else if (nameType == "ushort" || nameType == "short") size = 2;
else if (nameType == "uchar" || nameType == "char") size = 1;
else {
throw MLIB_EXCEPTION("unkown data type");
}
return size;
}

static void PlyHeaderLine(const std::string& line, PlyHeader& header, std::string& activeElement) {

std::stringstream ss(line);
Expand Down Expand Up @@ -80,15 +97,24 @@ namespace ml {
if (p.name == "red") header.m_bHasColors = true;
}

if (p.nameType == "double") p.byteSize = 8;
else if (p.nameType == "float" || p.nameType == "int" || p.nameType == "uint") p.byteSize = 4;
else if (p.nameType == "ushort" || p.nameType == "short") p.byteSize = 2;
else if (p.nameType == "uchar" || p.nameType == "char") p.byteSize = 1;
else {
throw MLIB_EXCEPTION("unkown data type");
}
p.byteSize = getByteSizeFromNameType(p.nameType);
header.m_properties[activeElement].push_back(p);
}
// read the line about face indices
//eg: property list uchar int vertex_indices
//eg: property list int int vertex_indices
else if (util::endsWith(line, "vertex_indices") || util::endsWith(line, "vertex_index")) {
PlyHeader::PlyPropertyHeader p;
std::string ignore;
// "list"
ss >> ignore;
// uchar/int
ss >> p.nameType;
// create our own name for this
p.name = "verticesPerFace";
p.byteSize = getByteSizeFromNameType(p.nameType);
header.m_properties[p.name].push_back(p);
}
else {
//property belonging to unknown element
}
Expand Down