DjalimSimaila/LesDingeriesDeDjalimSurOpenGL
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✨ feat(mesh): add optional vertical flip when loading OBJ files

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Add a boolean flag to Mesh3D constructor and loadOBJFile to optionally
flip the Y coordinate of vertices.
Update engine to use this flag for specific objects (e.g., mimikyu) that
require flipping.
This commit is contained in:
Djalim Simaila 2025-10-29 21:29:13 +01:00
parent cae53dca8b
commit 652577d0e6
3 changed files with 11 additions and 7 deletions
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4
include/Mesh3D.h
View File

@ -12,8 +12,8 @@ namespace djalim {
public:
Mesh3D();
Mesh3D(const std::string& filepath);
void loadOBJFile(const std::string& filepath);
Mesh3D(const std::string& filepath, bool flipObjectVertically = false);
void loadOBJFile(const std::string& filepath, bool flipObjectVertically = false);
public:
Texture2D texture;
glm::vec3 position = {0.0f, 0.0f, 0.0f};

11
src/core/Mesh3D.cpp
View File

@ -23,11 +23,11 @@ struct objFace {
djalim::Mesh3D::Mesh3D(){}
djalim::Mesh3D::Mesh3D(const std::string& filepath) {
loadOBJFile(filepath);
djalim::Mesh3D::Mesh3D(const std::string& filepath, bool flipObjectVertically) {
loadOBJFile(filepath, flipObjectVertically);
}
void djalim::Mesh3D::loadOBJFile(const std::string& filepath) {
void djalim::Mesh3D::loadOBJFile(const std::string& filepath, bool flipObjectVertically) {
std::ifstream file(filepath);
if (!file.is_open()) {
std::cerr << "Failed to open OBJ file: " << filepath << std::endl;
@ -48,7 +48,10 @@ void djalim::Mesh3D::loadOBJFile(const std::string& filepath) {
if (type == "v") {
float x, y, z;
ss >> x >> y >> z;
vertices.push_back({x, y, z});
if(flipObjectVertically)
vertices.push_back({x, -y, z});
else
vertices.push_back({x, y, z});
numMeshVertices++;
}
else if (type == "vn") {

3
src/core/engine.cpp
View File

@ -65,7 +65,8 @@ void djalim::OpenGlEngine::createObject(std::string name, std::string textures,
void djalim::OpenGlEngine::createObject(std::string name, std::string textures, std::string filepath){
// Load the mesh from the file
objects[name] = std::make_unique<Mesh3D>(Mesh3D(filepath));
bool flip = (name == "mimikyu");
objects[name] = std::make_unique<Mesh3D>(Mesh3D(filepath, flip));
bool textureLoaded = objects[name]->texture.loadTexture(textures);