2025-02-23 19:38:30 +01:00
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#include <fstream>
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#include <sstream>
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#include "model.h"
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Model::Model(const std::string filename) {
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std::ifstream in;
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in.open(filename, std::ifstream::in);
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if (in.fail()) return;
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std::string line;
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while (!in.eof()) {
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std::getline(in, line);
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std::istringstream iss(line.c_str());
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char trash;
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if (!line.compare(0, 2, "v ")) {
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iss >> trash;
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2025-08-14 16:25:41 +02:00
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vec4 v = {0,0,0,1};
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2025-02-23 19:38:30 +01:00
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for (int i : {0,1,2}) iss >> v[i];
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verts.push_back(v);
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2025-08-14 10:00:25 +02:00
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} else if (!line.compare(0, 3, "vn ")) {
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iss >> trash >> trash;
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2025-08-14 16:25:41 +02:00
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vec4 n;
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2025-08-14 10:00:25 +02:00
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for (int i : {0,1,2}) iss >> n[i];
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norms.push_back(normalized(n));
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2025-08-14 16:25:41 +02:00
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} else if (!line.compare(0, 3, "vt ")) {
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iss >> trash >> trash;
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vec2 uv;
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for (int i : {0,1}) iss >> uv[i];
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tex.push_back({uv.x, 1-uv.y});
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2025-02-23 19:38:30 +01:00
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} else if (!line.compare(0, 2, "f ")) {
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int f,t,n, cnt = 0;
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iss >> trash;
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while (iss >> f >> trash >> t >> trash >> n) {
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facet_vrt.push_back(--f);
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2025-08-14 16:25:41 +02:00
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facet_tex.push_back(--t);
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2025-08-14 10:00:25 +02:00
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facet_nrm.push_back(--n);
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2025-02-23 19:38:30 +01:00
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cnt++;
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}
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if (3!=cnt) {
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std::cerr << "Error: the obj file is supposed to be triangulated" << std::endl;
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return;
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}
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}
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}
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std::cerr << "# v# " << nverts() << " f# " << nfaces() << std::endl;
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2025-08-14 16:25:41 +02:00
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auto load_texture = [&filename](const std::string suffix, TGAImage &img) {
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size_t dot = filename.find_last_of(".");
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if (dot==std::string::npos) return;
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std::string texfile = filename.substr(0,dot) + suffix;
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std::cerr << "texture file " << texfile << " loading " << (img.read_tga_file(texfile.c_str()) ? "ok" : "failed") << std::endl;
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};
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2025-08-27 09:38:58 +02:00
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load_texture("_diffuse.tga", diffusemap );
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2025-08-27 14:30:42 +02:00
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load_texture("_nm_tangent.tga", normalmap);
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2025-08-27 09:38:58 +02:00
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load_texture("_spec.tga", specularmap);
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2025-02-23 19:38:30 +01:00
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}
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int Model::nverts() const { return verts.size(); }
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int Model::nfaces() const { return facet_vrt.size()/3; }
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2025-08-14 16:25:41 +02:00
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vec4 Model::vert(const int i) const {
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2025-02-23 19:38:30 +01:00
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return verts[i];
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}
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2025-08-14 16:25:41 +02:00
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vec4 Model::vert(const int iface, const int nthvert) const {
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2025-02-23 19:38:30 +01:00
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return verts[facet_vrt[iface*3+nthvert]];
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}
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2025-08-14 16:25:41 +02:00
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vec4 Model::normal(const int iface, const int nthvert) const {
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2025-08-14 10:00:25 +02:00
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return norms[facet_nrm[iface*3+nthvert]];
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}
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2025-08-14 16:25:41 +02:00
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vec4 Model::normal(const vec2 &uv) const {
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TGAColor c = normalmap.get(uv[0]*normalmap.width(), uv[1]*normalmap.height());
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2025-08-27 14:30:42 +02:00
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return normalized(vec4{(double)c[2],(double)c[1],(double)c[0],0}*2./255. - vec4{1,1,1,0});
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2025-08-14 16:25:41 +02:00
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}
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vec2 Model::uv(const int iface, const int nthvert) const {
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return tex[facet_tex[iface*3+nthvert]];
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}
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2025-08-27 09:38:58 +02:00
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const TGAImage& Model::diffuse() const { return diffusemap; }
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const TGAImage& Model::specular() const { return specularmap; }
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