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//
// Stiches multiple .obj files into one .obj.
//
#include "obj_writer.h"
#include "../../tiny_obj_loader.h"
#include <cassert>
#include <iostream>
#include <cstdlib>
#include <cstdio>
typedef std::vector<tinyobj::shape_t> Shape;
typedef std::vector<tinyobj::material_t> Material;
typedef tinyobj::attrib_t Attribute;
void
StichObjs(
tinyobj::attrib_t& out_attribute,
std::vector<tinyobj::shape_t>& out_shape,
std::vector<tinyobj::material_t>& out_material,
const std::vector<Attribute>& attributes,
const std::vector<Shape>& shapes,
const std::vector<Material>& materials)
{
// The amount of attributes, shape-vectors and material-vecotrs should be the same.
if(attributes.size() != shapes.size() && attributes.size() != materials.size()){
std::cerr << "Size of attributes, shapes and Materials don't fit!" << attributes.size() << " " << shapes.size() <<" " << materials.size() << std::endl;;
exit(1);
}
int num_shapes = 0;
// 4 values (vertices, normals, texcoords, colors)
std::vector<int> num_attributes(4, 0);
int num_materials = 0;
for(int i = 0; i < shapes.size(); i++){
num_shapes += shapes[i].size();
}
for(int i = 0; i < attributes.size(); i++){
num_attributes[0] += attributes[i].vertices.size();
num_attributes[1] += attributes[i].normals.size();
num_attributes[2] += attributes[i].texcoords.size();
num_attributes[3] += attributes[i].colors.size();
}
for(int i = 0; i < materials.size(); i++){
num_materials += materials[i].size();
}
// More performant, than push_back
out_attribute.vertices.resize(num_attributes[0]);
out_attribute.normals.resize(num_attributes[1]);
out_attribute.texcoords.resize(num_attributes[2]);
out_attribute.colors.resize(num_attributes[3]);
out_shape.resize(num_shapes);
out_material.resize(num_materials);
int material_id_offset = 0;
int shape_id_offset = 0;
int vertex_idx_offset = 0;
int normal_idx_offset = 0;
int texcoord_idx_offset = 0;
int color_idx_offset = 0;
// shapes.size() = attributes.size() = materials.size()
for (size_t i = 0; i < shapes.size(); i++) {
// Copy shapes
for (size_t k = 0; k < shapes[i].size(); k++) {
std::string new_name = shapes[i][k].name;
// Add suffix
char buf[1024];
sprintf(buf, "_%04d", (int)i);
new_name += std::string(buf);
printf("shape[%ld][%ld].name = %s\n", i, k, shapes[i][k].name.c_str());
tinyobj::shape_t new_shape = shapes[i][k];
// Add material offset.
for(size_t f = 0; f < new_shape.mesh.material_ids.size(); f++) {
new_shape.mesh.material_ids[f] += material_id_offset;
}
// Add indices offset.
for(size_t f = 0; f < new_shape.mesh.indices.size(); f++){
tinyobj::index_t& ref = new_shape.mesh.indices[f];
if(ref.vertex_index > -1){
ref.vertex_index += vertex_idx_offset;
}
if(ref.normal_index > -1){
ref.normal_index += normal_idx_offset;
}
if(ref.texcoord_index > -1){
ref.texcoord_index += texcoord_idx_offset;
}
}
new_shape.name = new_name;
printf("shape[%ld][%ld].new_name = %s\n", i, k, new_shape.name.c_str());
out_shape[shape_id_offset++] = new_shape;
}
// Copy materials
for (size_t k = 0; k < materials[i].size(); k++) {
out_material[material_id_offset++] = materials[i][k];
}
// Copy attributes (3 floats per vertex, 3 floats per normal, 2 floats per texture-coordinate, 3 floats per color)
// You could also include a check here, if the sizes are dividable by 3 (resp. 2), but it's safe to simply assume, they do.
std::copy(attributes[i].vertices.begin(), attributes[i].vertices.end(), out_attribute.vertices.begin() + vertex_idx_offset * 3);
vertex_idx_offset += attributes[i].vertices.size() / 3;
std::copy(attributes[i].normals.begin(), attributes[i].normals.end(), out_attribute.normals.begin() + normal_idx_offset * 3);
normal_idx_offset += attributes[i].normals.size() / 3;
std::copy(attributes[i].texcoords.begin(), attributes[i].texcoords.end(), out_attribute.texcoords.begin() + texcoord_idx_offset * 2);
texcoord_idx_offset += attributes[i].texcoords.size() / 2;
std::copy(attributes[i].colors.begin(), attributes[i].colors.end(), out_attribute.colors.begin() + color_idx_offset);
color_idx_offset += attributes[i].colors.size();
}
}
int main(int argc, char **argv)
{
if (argc < 3) {
printf("Usage: obj_sticher input0.obj input1.obj ... output.obj\n");
exit(1);
}
int num_objfiles = argc - 2;
std::string out_filename = std::string(argv[argc-1]); // last element
std::vector<Attribute> attributes(num_objfiles);
std::vector<Shape> shapes(num_objfiles);
std::vector<Material> materials(num_objfiles);
for (int i = 0; i < num_objfiles; i++) {
std::cout << "Loading " << argv[i+1] << " ... " << std::flush;
std::string warn;
std::string err;
bool ret = tinyobj::LoadObj(&attributes[i], &shapes[i], &materials[i], &warn, &err, argv[i+1]);
if (!warn.empty()) {
std::cerr << "WARN:" << warn << std::endl;
}
if (!err.empty()) {
std::cerr << err << std::endl;
}
if (!ret) {
exit(1);
}
std::cout << "DONE." << std::endl;
}
Attribute out_attribute;
Shape out_shape;
Material out_material;
StichObjs(out_attribute, out_shape, out_material, attributes, shapes, materials);
bool coordTransform = true;
bool ret = WriteObj(out_filename, out_attribute, out_shape, out_material, coordTransform);
assert(ret);
return 0;
}
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