From 652577d0e698f3d2aef9ab42108ec41eae36d4a4 Mon Sep 17 00:00:00 2001
From: Djalim Simaila <DjalimS.pro@outlook.fr>
Date: Wed, 29 Oct 2025 21:29:13 +0100
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20feat(mesh):=20add=20optional=20vert?=
 =?UTF-8?q?ical=20flip=20when=20loading=20OBJ=20files?=
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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.
---
 include/Mesh3D.h    |  4 ++--
 src/core/Mesh3D.cpp | 11 +++++++----
 src/core/engine.cpp |  3 ++-
 3 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/include/Mesh3D.h b/include/Mesh3D.h
index bde7940..0d90aed 100644
--- a/include/Mesh3D.h
+++ b/include/Mesh3D.h
@@ -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};
diff --git a/src/core/Mesh3D.cpp b/src/core/Mesh3D.cpp
index 4041bd5..61add7b 100644
--- a/src/core/Mesh3D.cpp
+++ b/src/core/Mesh3D.cpp
@@ -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") {
diff --git a/src/core/engine.cpp b/src/core/engine.cpp
index a29de3f..385ec04 100644
--- a/src/core/engine.cpp
+++ b/src/core/engine.cpp
@@ -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);