first attempt at .obj loading (bad normal indices)

data/models/cube.obj

+# Blender v2.90.1 OBJ File: ''
+# www.blender.org
+mtllib untitled.mtl
+o Cube
+v 1.000000 -1.000000 1.000000
+v 1.000000 1.000000 1.000000
+v 1.000000 -1.000000 -1.000000
+v 1.000000 1.000000 -1.000000
+v -1.000000 -1.000000 1.000000
+v -1.000000 1.000000 1.000000
+v -1.000000 -1.000000 -1.000000
+v -1.000000 1.000000 -1.000000
+vt 0.875000 0.500000
+vt 0.625000 0.750000
+vt 0.625000 0.500000
+vt 0.375000 1.000000
+vt 0.375000 0.750000
+vt 0.625000 0.000000
+vt 0.375000 0.250000
+vt 0.375000 0.000000
+vt 0.375000 0.500000
+vt 0.125000 0.750000
+vt 0.125000 0.500000
+vt 0.625000 0.250000
+vt 0.875000 0.750000
+vt 0.625000 1.000000
+vn 0.0000 -1.0000 0.0000
+vn 0.0000 0.0000 -1.0000
+vn -1.0000 0.0000 0.0000
+vn 0.0000 1.0000 0.0000
+vn 1.0000 0.0000 0.0000
+vn 0.0000 0.0000 1.0000
+usemtl Material
+s off
+f 5/1/1 3/2/1 1/3/1
+f 3/2/2 8/4/2 4/5/2
+f 7/6/3 6/7/3 8/8/3
+f 2/9/4 8/10/4 6/11/4
+f 1/3/5 4/5/5 2/9/5
+f 5/12/6 2/9/6 6/7/6
+f 5/1/1 7/13/1 3/2/1
+f 3/2/2 7/14/2 8/4/2
+f 7/6/3 5/12/3 6/7/3
+f 2/9/4 4/5/4 8/10/4
+f 1/3/5 3/2/5 4/5/5
+f 5/12/6 1/3/6 2/9/6

src/gfx/CMakeLists.txt

@@ -46,6 +46,9 @@ add_library(${THIS_TARGET_NAME}
     ./include/gfx/aabb.hpp
     ./src/aabb.cpp
 
+    ./include/gfx/obj_loader.hpp
+    ./src/obj_loader.cpp
+
     # ./include/osi/opengl.hpp
     # ./include/osi/gui.hpp
     )

src/gfx/include/gfx/obj_loader.hpp

+#ifndef OBJ_LOADER_INCLUDED
+#define OBJ_LOADER_INCLUDED
+
+#include <vector>
+#include <string>
+#include <stdexcept>
+#include <memory>
+#include <tiny_obj_loader.h>
+
+#include <gfx/object.hpp>
+
+using object_ptr = std::shared_ptr<Object>;
+
+object_ptr load_object(std::string const& model_path);
+
+#endif
\ No newline at end of file

src/gfx/src/obj_loader.cpp

+#include <gfx/obj_loader.hpp>
+
+
+object_ptr load_object(std::string const& model_path)
+{
+    tinyobj::attrib_t attrib;
+    std::vector<tinyobj::shape_t> shapes;
+    std::vector<tinyobj::material_t> objmaterials;
+    std::string warn, err;
+
+    
+
+    if (!tinyobj::LoadObj(&attrib, &shapes, &objmaterials, &warn, &err, model_path.c_str()))
+        throw(std::runtime_error(warn + err));
+
+
+    std::vector<unsigned int> indices;
+
+    for(auto shape = shapes.begin(); shape < shapes.end(); ++shape)
+    {
+        const std::vector<tinyobj::index_t> &obj_indices = shape->mesh.indices;
+        // const std::vector<int>& material_ids = shape->mesh.material_ids;
+
+        for (auto index = 0; index < obj_indices.size(); index += 1)
+        {
+            indices.emplace_back(obj_indices[index].vertex_index);
+        }
+    }
+
+    object_ptr result = std::make_shared<Object>(attrib.vertices, indices, attrib.normals);
+    return std::move(result);
+}
\ No newline at end of file

src/studio/src/simulator.cpp

@@ -6,14 +6,15 @@
 #include <glad/glad.h>
 #include <gfx/shader.hpp>
 #include <gfx/render.hpp>
+#include <gfx/obj_loader.hpp>
 #include <iostream>
 #include <vector>
+#include <filesystem>
 
 #include <glm/gtc/constants.hpp>
 #include <glm/gtx/intersect.hpp>
 #include <limits>
 #include <algorithm>
-#include <tiny_obj_loader.h>
 
 namespace studio {
 std::vector<float> obj_vertices =
@@ -291,6 +292,22 @@ void Simulator::createScene()
     grid->setSelectability(false);                                       
     scene.back()->addObject(std::move(grid));
 
+    /* ADD DEER */
+    scene.emplace_back(std::make_shared<Node>(std::make_shared<Frame>(glm::vec3(0, 2, 0))));
+    object_ptr deer = load_object("./data/models/deer.obj");
+    scene.back()->getFrame()->setScale(glm::vec3(0.01f, 0.01f, 0.01f));
+    scene.back()->addObject(std::move(deer));
+
+    /* ADD .OBJ CUBE */
+    scene.emplace_back(std::make_shared<Node>(std::make_shared<Frame>(glm::vec3(-3, 2, 0))));
+    object_ptr file_cube = load_object("./data/models/cube.obj");
+    scene.back()->addObject(std::move(file_cube));
+
+    /* ADD .OBJ VASE */
+    scene.emplace_back(std::make_shared<Node>(std::make_shared<Frame>(glm::vec3(2, 1, -1))));
+    object_ptr vase = load_object("./data/models/smooth_vase.obj");
+    scene.back()->addObject(std::move(vase));
+
     /* ADD CAMERA */
     scene.emplace_back(std::make_shared<Node>(std::make_shared<Frame>(glm::vec3(0.0f, 1.0f, 6.0f))));
     scene.back()->addObject(std::make_shared<Camera>(60.0f, scene.back()->getFrame()));