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https://github.com/TheRedShip/RT_GPU.git
synced 2025-09-27 18:48:36 +02:00
change obj parsing to its own object and start polygon triangulation
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218
srcs/class/ObjParser.cpp
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218
srcs/class/ObjParser.cpp
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/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* ObjParser.cpp :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: tomoron <tomoron@student.42angouleme.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2025/01/16 15:00:33 by tomoron #+# #+# */
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/* Updated: 2025/01/16 22:00:46 by tomoron ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "RT.hpp"
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ObjParser::ObjParser(std::string &filename)
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{
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_file.open(filename);
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if(!_file.is_open())
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throw std::runtime_error("OBJ : could not open object file");
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}
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ObjParser::~ObjParser()
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{
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_file.close();
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}
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glm::vec3 ObjParser::getVertex(std::stringstream &line)
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{
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glm::vec3 res;
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if(!(line >> res.x >> res.y >> res.z))
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throw std::runtime_error("syntax error in obj file while parsing vertex");
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return(res);
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}
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long int ObjParser::checkVertexIndex(int index, size_t size)
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{
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if((size_t)index > size || index == 0 || (index < 0 && (size_t)(-index) > size))
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throw std::runtime_error("obj file error, invalid vertex index");
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if(index < 0)
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index = size - index;
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return(index - 1);
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}
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//void ObjParser::isEar(glm::vec3 v1, glm::vec3 v2, glm::vec3 v3, std::vector<glm::vec3> &vertices)
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//{
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//
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//}
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void ObjParser::addTriangleFromPolygon(std::vector<glm::vec3> &vertices, Scene &scene)
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{
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glm::vec3 normal;
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glm::vec3 v1, v2 ,v3, v4;
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(void)scene;
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for (size_t i = 0; i < vertices.size(); i++)
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{
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v1 = vertices[(i - 1) % vertices.size()];
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v2 = vertices[i];
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v3 = vertices[(i + 1) % vertices.size()];
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v4 = vertices[(i + 2) % vertices.size()];
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normal = glm::normalize(glm::cross(v2 - v1, v3 - v1));
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std::cout << glm::to_string(normal) << std::endl;
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float dot = glm::dot(normal, v4 - v1);
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std::cout << dot << std::endl;
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//if(isEar(v1, v2 ,v3, vertices))
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//{
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// vertices.erase(vertices.begin() + i);
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// scene.addObject(new Triangle(v1, v2 ,v3));
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//}
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}
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std::cout << std::endl;
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std::cout << std::endl;
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std::cout << std::endl;
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std::cout << std::endl;
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}
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void ObjParser::addFace(std::stringstream &line, std::vector<glm::vec3> &vertices, int mat, Scene &scene)
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{
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int vert_index;
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std::vector<glm::vec3> face_vertices;
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(void)mat;
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(void)scene;
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while((line >> vert_index))
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face_vertices.push_back(vertices[checkVertexIndex(vert_index, vertices.size())]);
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if(face_vertices.size() < 3)
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throw std::runtime_error("OBJ : face does not have enough vertices");
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for(size_t i = 0; i < face_vertices.size(); i++)
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std::cout << face_vertices[i].x << " " << face_vertices[i].y << " " << face_vertices[i].z << " | ";
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std::cout << std::endl;
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// while(face_vertices.size() > 3)
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// addTriangleFromPolygon(face_vertices, scene);
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if(!line.eof())
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throw std::runtime_error("OBJ: an error occured while parsing face");
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addTriangle(face_vertices[0], face_vertices[1], face_vertices[2],mat, scene);
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}
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void ObjParser::addTriangle(glm::vec3 v1, glm::vec3 v2, glm::vec3 v3, int mat, Scene &scene)
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{
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scene.addObject(new Triangle(v1, v2, v3, mat));
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}
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void ObjParser::parseMtl(std::stringstream &input_line, std::map<std::string, int> &materials, Scene &scene)
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{
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std::string filename;
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std::ifstream file;
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std::string matName;
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std::string identifier;
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std::string line;
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Material *mat;
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input_line >> filename;
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file.open(filename);
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mat = 0;
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if(!file.is_open())
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throw std::runtime_error("OBJ : could not open material file");
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while(getline(file, line))
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{
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if (line.empty() || line[0] == '#')
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continue;
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std::stringstream lineStream(line);
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lineStream >> identifier;
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if(identifier == "newmtl")
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{
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if(mat)
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{
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scene.addMaterial(mat);
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materials[matName] = scene.getMaterialData().size() - 1;
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}
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lineStream >> matName;
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if(matName.empty())
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throw std::runtime_error("OBJ: syntax error in material file, missing material name");
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mat = new Material;
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memset(mat, 0, sizeof(Material));
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mat->metallic = 1.0f;
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continue;
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}
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if(!mat)
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throw std::runtime_error("OBJ: error in material file, material name not defined");
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if(identifier == "Kd")
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{
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if(!(lineStream >> mat->color.x >> mat->color.y >> mat->color.z))
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throw std::runtime_error("OBJ: syntax error while getting material color");
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}
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else if(identifier == "Ns")
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{
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if(!(lineStream >> mat->roughness) || mat->roughness > 1000 || mat->roughness < 0)
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throw std::runtime_error("OBJ: syntax error while getting material softness");
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mat->roughness /= 1000;
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}
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else if(identifier == "Ke")
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{
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float x, y, z;
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if(!(lineStream >> x >> y >> z))
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throw std::runtime_error("OBJ: syntax error while getting material emission");
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mat->emission = (x + y + z) / 3;
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}
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else if(identifier == "Ni")
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{
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if(!(lineStream >> mat->refraction))
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throw std::runtime_error("OBJ: syntax error while getting material refraction");
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}
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else
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std::cerr << "unsupported material setting : " << identifier << std::endl;
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}
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if(mat)
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{
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scene.addMaterial(mat);
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materials[matName] = scene.getMaterialData().size() - 1;
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}
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file.close();
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}
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void ObjParser::parse(Scene &scene)
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{
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std::vector<glm::vec3> vertices;
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std::string filename;
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std::map<std::string, int> matNames;
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std::string line;
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std::string identifier;
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std::ifstream file;
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int curMat;
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curMat = 0;
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while (getline(_file, line))
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{
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try{
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if(line[0] == '#' || line.empty())
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continue;
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std::stringstream lineStream(line);
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identifier = "";
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lineStream >> identifier;
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if(identifier == "v")
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vertices.push_back(getVertex(lineStream));
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else if (identifier == "f")
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addFace(lineStream, vertices, curMat, scene);
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else if (identifier == "mtllib")
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parseMtl(lineStream, matNames, scene);
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else if (identifier == "usemtl")
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{
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lineStream >> identifier;
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if(matNames.find(identifier) == matNames.end())
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throw std::runtime_error("OBJ: invalid material name");
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curMat = matNames[identifier];
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}
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}catch (std::exception &e)
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{
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std::cerr << line << std::endl;
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throw;
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}
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}
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}
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