update obj loader
This commit is contained in:
Chuyuan Fu
@@ -38,51 +38,102 @@ Licensed under 2 clause BSD.
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Usage
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-----
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Data format
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attrib_t contains single and linear array of vertex data(position, normal and texcoord).
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std::string inputfile = "cornell_box.obj";
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std::vector<tinyobj::shape_t> shapes;
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std::string err = tinyobj::LoadObj(shapes, inputfile.c_str());
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if (!err.empty()) {
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std::cerr << err << std::endl;
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exit(1);
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}
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std::cout << "# of shapes : " << shapes.size() << std::endl;
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for (size_t i = 0; i < shapes.size(); i++) {
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printf("shape[%ld].name = %s\n", i, shapes[i].name.c_str());
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printf("shape[%ld].indices: %ld\n", i, shapes[i].mesh.indices.size());
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assert((shapes[i].mesh.indices.size() % 3) == 0);
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for (size_t f = 0; f < shapes[i].mesh.indices.size(); f++) {
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printf(" idx[%ld] = %d\n", f, shapes[i].mesh.indices[f]);
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}
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printf("shape[%ld].vertices: %ld\n", i, shapes[i].mesh.positions.size());
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assert((shapes[i].mesh.positions.size() % 3) == 0);
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for (size_t v = 0; v < shapes[i].mesh.positions.size() / 3; v++) {
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printf(" v[%ld] = (%f, %f, %f)\n", v,
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shapes[i].mesh.positions[3*v+0],
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shapes[i].mesh.positions[3*v+1],
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shapes[i].mesh.positions[3*v+2]);
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}
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printf("shape[%ld].material.name = %s\n", i, shapes[i].material.name.c_str());
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printf(" material.Ka = (%f, %f ,%f)\n", shapes[i].material.ambient[0], shapes[i].material.ambient[1], shapes[i].material.ambient[2]);
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printf(" material.Kd = (%f, %f ,%f)\n", shapes[i].material.diffuse[0], shapes[i].material.diffuse[1], shapes[i].material.diffuse[2]);
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printf(" material.Ks = (%f, %f ,%f)\n", shapes[i].material.specular[0], shapes[i].material.specular[1], shapes[i].material.specular[2]);
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printf(" material.Tr = (%f, %f ,%f)\n", shapes[i].material.transmittance[0], shapes[i].material.transmittance[1], shapes[i].material.transmittance[2]);
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printf(" material.Ke = (%f, %f ,%f)\n", shapes[i].material.emission[0], shapes[i].material.emission[1], shapes[i].material.emission[2]);
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printf(" material.Ns = %f\n", shapes[i].material.shininess);
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printf(" material.map_Ka = %s\n", shapes[i].material.ambient_texname.c_str());
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printf(" material.map_Kd = %s\n", shapes[i].material.diffuse_texname.c_str());
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printf(" material.map_Ks = %s\n", shapes[i].material.specular_texname.c_str());
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printf(" material.map_Ns = %s\n", shapes[i].material.normal_texname.c_str());
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std::map<std::string, std::string>::iterator it(shapes[i].material.unknown_parameter.begin());
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std::map<std::string, std::string>::iterator itEnd(shapes[i].material.unknown_parameter.end());
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for (; it != itEnd; it++) {
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printf(" material.%s = %s\n", it->first.c_str(), it->second.c_str());
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}
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printf("\n");
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attrib_t::vertices => 3 floats per vertex
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v[0] v[1] v[2] v[3] v[n-1]
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+-----------+-----------+-----------+-----------+ +-----------+
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| x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
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+-----------+-----------+-----------+-----------+ +-----------+
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attrib_t::normals => 3 floats per vertex
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n[0] n[1] n[2] n[3] n[n-1]
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+-----------+-----------+-----------+-----------+ +-----------+
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| x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
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+-----------+-----------+-----------+-----------+ +-----------+
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attrib_t::texcoords => 2 floats per vertex
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t[0] t[1] t[2] t[3] t[n-1]
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+-----------+-----------+-----------+-----------+ +-----------+
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| u | v | u | v | u | v | u | v | .... | u | v |
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+-----------+-----------+-----------+-----------+ +-----------+
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attrib_t::colors => 3 floats per vertex(vertex color. optional)
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c[0] c[1] c[2] c[3] c[n-1]
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+-----------+-----------+-----------+-----------+ +-----------+
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| x | y | z | x | y | z | x | y | z | x | y | z | .... | x | y | z |
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+-----------+-----------+-----------+-----------+ +-----------+
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Each shape_t::mesh_t does not contain vertex data but contains array index to attrib_t. See loader_example.cc for more details.
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mesh_t::indices => array of vertex indices.
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+----+----+----+----+----+----+----+----+----+----+ +--------+
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| i0 | i1 | i2 | i3 | i4 | i5 | i6 | i7 | i8 | i9 | ... | i(n-1) |
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+----+----+----+----+----+----+----+----+----+----+ +--------+
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Each index has an array index to attrib_t::vertices, attrib_t::normals and attrib_t::texcoords.
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mesh_t::num_face_vertices => array of the number of vertices per face(e.g. 3 = triangle, 4 = quad , 5 or more = N-gons).
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+---+---+---+ +---+
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| 3 | 4 | 3 | ...... | 3 |
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+---+---+---+ +---+
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| | | |
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| | | +-----------------------------------------+
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| | | |
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| | +------------------------------+ |
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| | | |
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| +------------------+ | |
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| | | |
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|/ |/ |/ |/
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mesh_t::indices
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| face[0] | face[1] | face[2] | | face[n-1] |
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+----+----+----+----+----+----+----+----+----+----+ +--------+--------+--------+
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| i0 | i1 | i2 | i3 | i4 | i5 | i6 | i7 | i8 | i9 | ... | i(n-3) | i(n-2) | i(n-1) |
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+----+----+----+----+----+----+----+----+----+----+ +--------+--------+--------+
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```c++
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#define TINYOBJLOADER_IMPLEMENTATION // define this in only *one* .cc
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#include "tiny_obj_loader.h"
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std::string inputfile = "cornell_box.obj";
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tinyobj::attrib_t attrib;
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std::vector<tinyobj::shape_t> shapes;
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LoadObj(attrib, shapes, inputfile.c_str());
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// Loop over shapes
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for (size_t s = 0; s < shapes.size(); s++) {
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// Loop over faces(polygon)
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size_t index_offset = 0;
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for (size_t f = 0; f < shapes[s].mesh.indices.size(); f++) {
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int fv = 3;
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// Loop over vertices in the face.
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for (size_t v = 0; v < fv; v++) {
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// access to vertex
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tinyobj::index_t idx = shapes[s].mesh.indices[index_offset + v];
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tinyobj::real_t vx = attrib.vertices[3*idx.vertex_index+0];
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tinyobj::real_t vy = attrib.vertices[3*idx.vertex_index+1];
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tinyobj::real_t vz = attrib.vertices[3*idx.vertex_index+2];
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tinyobj::real_t nx = attrib.normals[3*idx.normal_index+0];
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tinyobj::real_t ny = attrib.normals[3*idx.normal_index+1];
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tinyobj::real_t nz = attrib.normals[3*idx.normal_index+2];
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tinyobj::real_t tx = attrib.texcoords[2*idx.texcoord_index+0];
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tinyobj::real_t ty = attrib.texcoords[2*idx.texcoord_index+1];
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}
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index_offset += fv;
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}
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}
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```
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