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[mesh] Replacing custom code for mesh::saveToObj by using assimp library #1094

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Aug 12, 2021
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[mesh] Replacing custom code for mesh::saveToObj by using assimp library #1094

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87 changes: 52 additions & 35 deletions src/aliceVision/mesh/Mesh.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
#include <boost/filesystem.hpp>

#include <assimp/Importer.hpp>
#include <assimp/Exporter.hpp>
#include <assimp/postprocess.h>
#include <assimp/scene.h>
#include <Eigen/Dense>
Expand All @@ -37,41 +38,57 @@ Mesh::~Mesh()

void Mesh::saveToObj(const std::string& filename)
{
ALICEVISION_LOG_INFO("Save mesh to obj: " << filename);
ALICEVISION_LOG_INFO("Nb points: " << pts.size());
ALICEVISION_LOG_INFO("Nb triangles: " << tris.size());

FILE* f = fopen(filename.c_str(), "w");

fprintf(f, "# \n");
fprintf(f, "# Wavefront OBJ file\n");
fprintf(f, "# Created with AliceVision\n");
fprintf(f, "# \n");
fprintf(f, "g Mesh\n");

if(_colors.size() == pts.size())
{
std::size_t i = 0;
for(const auto& point : pts)
{
const rgb& col = _colors[i];
fprintf(f, "v %f %f %f %f %f %f\n", point.x, point.y, point.z, col.r/255.0f, col.g/255.0f, col.b/255.0f);
++i;
}
}
else
{
for(const auto& point : pts)
fprintf(f, "v %f %f %f\n", point.x, point.y, point.z);
}

for(int i = 0; i < tris.size(); ++i)
{
Mesh::triangle& t = tris[i];
fprintf(f, "f %i %i %i\n", t.v[0] + 1, t.v[1] + 1, t.v[2] + 1);
}
fclose(f);
ALICEVISION_LOG_INFO("Save mesh to obj done.");
ALICEVISION_LOG_INFO("Writing obj and mtl file.");

aiScene scene;

scene.mRootNode = new aiNode;

scene.mMeshes = new aiMesh*[1];
scene.mNumMeshes = 1;
scene.mRootNode->mMeshes = new unsigned int[1];
scene.mRootNode->mNumMeshes = 1;

scene.mMaterials = new aiMaterial*[1];
scene.mNumMaterials = 1;
scene.mMaterials[0] = new aiMaterial;

scene.mRootNode->mMeshes[0] = 0;
scene.mMeshes[0] = new aiMesh;
aiMesh * aimesh = scene.mMeshes[0];
aimesh->mMaterialIndex = 0;

aimesh->mNumVertices = pts.size();
aimesh->mVertices = new aiVector3D[pts.size()];

int index = 0;
for (const auto & p : pts)
{
aimesh->mVertices[index].x = p.x;
aimesh->mVertices[index].y = p.y;
aimesh->mVertices[index].z = p.z;

++index;
}

aimesh->mNumFaces = tris.size();
aimesh->mFaces = new aiFace[tris.size()];

for(int i = 0; i < tris.size(); ++i)
{
aimesh->mFaces[i].mNumIndices = 3;
aimesh->mFaces[i].mIndices = new unsigned int[3];

for (int k = 0; k < 3; ++k)
{
aimesh->mFaces[i].mIndices[k] = tris[i].v[k];
}
}

Assimp::Exporter exporter;
exporter.Export(&scene, "objnomtl", filename);

ALICEVISION_LOG_INFO("Save mesh to obj done.");
}

bool Mesh::loadFromBin(const std::string& binFileName)
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