diff --git a/16-scene-refactor/config.json b/16-scene-refactor/config.json
new file mode 100644
index 0000000..4a82221
--- /dev/null
+++ b/16-scene-refactor/config.json
@@ -0,0 +1,96 @@
+{
+  "scene": {
+    "shader": {
+      "vertex_path": "shaders/16-vert.glsl",
+      "frag_path": "shaders/16-frag.glsl"
+    },
+    "light_shader": {
+      "vertex_path": "shaders/16-vert.glsl",
+      "frag_path": "shaders/16-lightsource.frag.glsl"
+    },
+    "materials": {
+      "crate": {
+        "ambient": [0.5, 0.5, 0.5],
+        "shininess": 32.0,
+        "diffuseMap": 0,
+        "specularMap": 0
+      },
+      "popcorn": {
+        "ambient": [0.5, 0.25, 0.31],
+        "shininess": 10000.0,
+        "diffuseMap": 0,
+        "specularMap": 0
+      }
+    },
+    "models": {
+      "crate": {
+        "directory": "assets",
+        "model_path": "crate.obj"
+      }
+    },
+    "things": [
+      {"model": "crate", "position": [0.0,  0.0,  0.0], "material": "crate"},
+      {"model": "crate", "position": [2.0,  5.0, -15.0], "material": "crate"},
+      {"model": "crate", "position": [-1.5, -2.2, -2.5], "material": "crate"},
+      {"model": "crate", "position": [-3.8, -2.0, -12.3], "material": "crate"},
+      {"model": "crate", "position": [ 2.4, -0.4, -3.5], "material": "crate"},
+      {"model": "crate", "position": [-1.7,  3.0, -7.5], "material": "crate"},
+      {"model": "crate", "position": [ 1.3, -2.0, -2.5], "material": "crate"},
+      {"model": "crate", "position": [ 1.5,  2.0, -2.5], "material": "crate"},
+      {"model": "crate", "position": [ 1.5,  0.2, -1.5], "material": "crate"},
+      {"model": "crate", "position": [-1.3,  1.0, -1.5], "material": "crate"}
+    ],
+    "camera": {
+      "position": [0.0, 0.0, 3.0],
+      "front": [0.0, 0.0, -1.0],
+      "up": [0.0, 1.0, 0.0],
+      "direction": [0.0, 0.0, 0.0],
+      "movement_speed": 10.0
+    },
+    "light": {
+      "directional": [
+        {
+          "position": [0, 0, 0.0],
+          "direction":[-0.2, -1.0, -0.3],
+          "ambient":[0.2, 0.2, 0.2],
+          "diffuse":[0.8, 0.8, 0.8],
+          "specular":[1.0, 1.0, 1.0],
+          "constant": 0.0,
+          "linear": 0.0,
+          "quadratic": 0.0,
+          "cut_off": 0.0,
+          "outer_cut_off": 0.0
+        }
+      ],
+      "positioned": [
+        {
+          "position": [1.2, 1.0, 2.0],
+          "direction":[-0.2, -1.0, -0.3],
+          "ambient":[0.2, 0.2, 0.2],
+          "diffuse":[0.8, 0.8, 0.8],
+          "specular":[1.0, 1.0, 1.0],
+          "constant": 1.0,
+          "linear": 0.09,
+          "quadratic": 0.032,
+          "cut_off": 12.5,
+          "outer_cut_off": 17.5
+        }
+      ],
+      "spot": [
+
+      ],
+      "camera": {
+        "position":[2.2, 1.0, 2.0],
+        "direction":[0.0, 0.0, -1.0],
+        "ambient":[0.2, 0.2, 0.2],
+        "diffuse":[0.8, 0.8, 0.8],
+        "specular":[1.0, 1.0, 1.0],
+        "constant": 1.0,
+        "linear": 0.09,
+        "quadratic": 0.032,
+        "cut_off": 12.5,
+        "outer_cut_off": 17.5
+      }
+    }
+  }
+}
diff --git a/16-scene-refactor/meson.build b/16-scene-refactor/meson.build
index 72a3c9a..6edf5a7 100644
--- a/16-scene-refactor/meson.build
+++ b/16-scene-refactor/meson.build
@@ -61,12 +61,12 @@ glfw3 = subproject('glfw').get_variable('glfw_dep')
 fuc2 = subproject('fuc2').get_variable('fuc2_dep')
 fmt = subproject('fmt').get_variable('fmt_dep')
 glm = subproject('glm').get_variable('glm_dep')
-box2d = subproject('box2d').get_variable('box2d_dep')
+json = subproject('nlohmann_json').get_variable('nlohmann_json_dep')
 
 assimp = subproject('assimp').get_variable('assimp_dep')
 
 dependencies += [
-  glfw3, fuc2, fmt, glm, box2d, assimp
+  glfw3, fuc2, fmt, glm, assimp, json
 ]
 
 inc_dirs = ['src']
@@ -76,8 +76,8 @@ sources = [
   'src/dbc.cpp',
   'src/stb_image.cpp',
   'src/shader.cpp',
-  'src/physics.cpp',
   'src/mesh.cpp',
+  'src/utils.cpp',
   'src/model.cpp',
   'src/scene.cpp',
   'src/camera.cpp',
diff --git a/16-scene-refactor/shaders/16-frag.glsl b/16-scene-refactor/shaders/16-frag.glsl
new file mode 100644
index 0000000..4ca5ff5
--- /dev/null
+++ b/16-scene-refactor/shaders/16-frag.glsl
@@ -0,0 +1,162 @@
+#version 330 core
+struct Material {
+  sampler2D diffuse;
+  sampler2D specular;
+  float shininess;
+};
+
+out vec4 FragColor;
+in vec3 FragPos;
+in vec3 Normal;
+in vec2 TexCoords;
+
+uniform vec3 viewPos;
+uniform Material material;
+
+struct DirLight {
+  vec3 direction;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+};
+
+struct PointLight {
+  vec3 position;
+  vec3 ambient;
+  vec3 diffuse;
+  vec3 specular;
+  float constant;
+  float linear;
+  float quadratic;
+};
+
+struct SpotLight {
+  vec3 direction;
+  vec3 position;
+  vec3 diffuse;
+  vec3 specular;
+  vec3 ambient;
+
+  float constant;
+  float linear;
+  float quadratic;
+  float cut_off;
+  float outer_cut_off;
+};
+
+
+#define MAX_LIGHTS 4
+uniform int pointLightCount = 0;
+uniform PointLight pointLights[MAX_LIGHTS];
+
+uniform int dirLightCount = 0;
+uniform DirLight dirLights[MAX_LIGHTS];
+
+uniform int spotLightCount = 0;
+uniform SpotLight spotLights[MAX_LIGHTS];
+
+vec3 CalcDirLight(DirLight light, vec3 normal, vec3 viewDir)
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+
+  vec3 lightDir = normalize(-light.direction);
+  // diffuse shading
+  float diff = max(dot(normal, lightDir), 0.0);
+
+  // specular shading
+  vec3 reflectDir = reflect(-lightDir, normal);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  vec3 ambient = light.ambient * mat_tex;
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+  vec3 specular = light.specular * spec * spec_tex;
+
+  return ambient + diffuse + specular;
+}
+
+vec3 CalcPointLight(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+  vec3 lightDir = normalize(light.position - fragPos);
+
+  // diffuse shading
+  float diff = max(dot(normal, lightDir), 0.0);
+
+  // specular shading
+  vec3 reflectDir = reflect(-lightDir, normal);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  // attenuation
+  float distance = length(light.position - fragPos);
+  float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
+
+  vec3 ambient = light.ambient * mat_tex;
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+  vec3 specular = light.specular * spec * spec_tex;
+
+  ambient *= attenuation;
+  diffuse *= attenuation;
+  specular *= attenuation;
+
+  return ambient + diffuse + specular;
+}
+
+vec3 CalcSpotLight(SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir)
+{
+  vec3 mat_tex = vec3(texture(material.diffuse, TexCoords));
+  vec3 spec_tex = vec3(texture(material.specular, TexCoords));
+  vec3 lightDir = normalize(light.position - fragPos);
+
+  // diffuse shading
+  float diff = max(dot(normal, lightDir), 0.0);
+
+  // specular shading
+  vec3 reflectDir = reflect(-lightDir, normal);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
+
+  // attenuation
+  float distance = length(light.position - fragPos);
+  float attenuation = 1.0 / (light.constant + light.linear * distance + light.quadratic * (distance * distance));
+
+  vec3 ambient = light.ambient * mat_tex;
+  vec3 diffuse = light.diffuse * diff * mat_tex;
+  vec3 specular = light.specular * spec * spec_tex;
+
+  float theta = dot(lightDir, normalize(-light.direction));
+  float epsilon = light.cut_off - light.outer_cut_off;
+  float intensity = clamp((theta - light.outer_cut_off) / epsilon, 0.0, 1.0);
+  diffuse *= intensity;
+  specular *= intensity;
+
+  ambient *= attenuation;
+  diffuse *= attenuation;
+  specular *= attenuation;
+
+  return ambient + diffuse + specular;
+}
+
+void main()
+{
+  vec3 norm = normalize(Normal);
+  vec3 viewDir = normalize(viewPos - FragPos);
+
+  // kick it off with the first dirlight
+  vec3 result = CalcDirLight(dirLights[0], norm, viewDir);
+
+  // then augment with more (off by one)
+  for(int i = 1; i < dirLightCount; i++) {
+    result += CalcDirLight(dirLights[i], norm, viewDir);
+  }
+
+  for(int i = 0; i < pointLightCount; i++) {
+    result += CalcPointLight(pointLights[i], norm, FragPos, viewDir);
+  }
+
+  for(int i = 0; i < spotLightCount; i++) {
+    result += CalcSpotLight(spotLights[i], norm, FragPos, viewDir);
+  }
+
+  FragColor = vec4(result, 1.0);
+}
diff --git a/16-scene-refactor/shaders/16-lightsource.frag.glsl b/16-scene-refactor/shaders/16-lightsource.frag.glsl
new file mode 100644
index 0000000..30728b2
--- /dev/null
+++ b/16-scene-refactor/shaders/16-lightsource.frag.glsl
@@ -0,0 +1,9 @@
+#version 330 core
+out vec4 FragColor;
+
+uniform vec3 diffuse;
+
+void main()
+{
+    FragColor = vec4(diffuse, 1.0); // set all 4 vector values to 1.0
+}
diff --git a/16-scene-refactor/shaders/16-vert.glsl b/16-scene-refactor/shaders/16-vert.glsl
new file mode 100644
index 0000000..276f393
--- /dev/null
+++ b/16-scene-refactor/shaders/16-vert.glsl
@@ -0,0 +1,20 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
+
+out vec3 FragPos;
+out vec3 Normal;
+out vec2 TexCoords;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0f);
+    FragPos = vec3(model * vec4(aPos, 1.0));
+    Normal = mat3(transpose(inverse(model))) * aNormal;
+    TexCoords = aTexCoords;
+}
diff --git a/16-scene-refactor/src/camera.cpp b/16-scene-refactor/src/camera.cpp
index b82557e..0d619b8 100644
--- a/16-scene-refactor/src/camera.cpp
+++ b/16-scene-refactor/src/camera.cpp
@@ -3,27 +3,27 @@
 #include <glm/gtc/type_ptr.hpp>
 
 glm::mat4 Camera::look_at() {
-  return glm::lookAt(pos, pos + front, up);
+  return glm::lookAt(position, position + front, up);
 }
 
 void Camera::forward() {
-  pos += speed * front;
+  position += speed * front;
 }
 
 void Camera::back() {
-  pos -= speed * front;
+  position -= speed * front;
 }
 
 void Camera::left() {
-  pos -= glm::normalize(glm::cross(front, up)) * speed;
+  position -= glm::normalize(glm::cross(front, up)) * speed;
 }
 
 void Camera::right() {
-  pos += glm::normalize(glm::cross(front, up)) * speed;
+  position += glm::normalize(glm::cross(front, up)) * speed;
 }
 
 void Camera::update(float deltaTime) {
-  speed = movementSpeed * deltaTime;
+  speed = movement_speed * deltaTime;
 }
 
 void Camera::mouse_move(double xpos, double ypos) {
diff --git a/16-scene-refactor/src/camera.hpp b/16-scene-refactor/src/camera.hpp
index 0da27be..2603e2d 100644
--- a/16-scene-refactor/src/camera.hpp
+++ b/16-scene-refactor/src/camera.hpp
@@ -2,11 +2,11 @@
 #include <glm/glm.hpp>
 
 struct Camera {
-  glm::vec3 pos = glm::vec3(0.0f, 0.0f, 3.0f);
-  glm::vec3 front = glm::vec3(0.0f, 0.0f, -1.0f);
-  glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f);
-  glm::vec3 direction = glm::vec3(0.0f, 0.0f, 0.0f);
-  float movementSpeed = 20.0f;
+  glm::vec3 position{0.0f, 0.0f, 3.0f};
+  glm::vec3 front{0.0f, 0.0f, -1.0f};
+  glm::vec3 up{0.0f, 1.0f, 0.0f};
+  glm::vec3 direction{0.0f, 0.0f, 0.0f};
+  float movement_speed = 20.0f;
 
   float pitch = 0.0f;
   float yaw = -90.0f;
diff --git a/16-scene-refactor/src/components.hpp b/16-scene-refactor/src/components.hpp
new file mode 100644
index 0000000..859e94a
--- /dev/null
+++ b/16-scene-refactor/src/components.hpp
@@ -0,0 +1,105 @@
+#pragma once
+
+#include <glm/glm.hpp>
+#include <vector>
+#include <map>
+#include "json.hpp"
+
+const unsigned int SCR_WIDTH = 800;
+const unsigned int SCR_HEIGHT = 600;
+
+#define MAX_LIGHTS 4
+
+namespace components {
+  template <typename T> struct NameOf;
+
+  struct Material {
+    glm::vec3 ambient{0.1f,0.1f,0.1f};
+    float shininess{32.0f};
+    unsigned int diffuseMap = 0;
+    unsigned int specularMap = 0;
+  };
+
+  ENROLL_COMPONENT(Material, ambient, shininess, diffuseMap, specularMap);
+
+  struct Light {
+    glm::vec3 position{0.0f, 0.0f, 0.0f};
+    glm::vec3 direction{0.0f, 0.0f, 0.0f};
+    glm::vec3 ambient{0.0f, 0.0f, 0.0f};
+    glm::vec3 diffuse{0.0f, 0.0f, 0.0f};
+    glm::vec3 specular{0.0f, 0.0f, 0.0f};
+
+    float constant=0.0f;
+    float linear=0.0f;
+    float quadratic=0.0f;
+    float cut_off=0.0f;
+    float outer_cut_off=0.0f;
+
+    void adjust(float amount) {
+      ambient += amount;
+      diffuse += amount;
+      specular += amount;
+    }
+  };
+
+  ENROLL_COMPONENT(Light,
+      position, direction,
+      ambient, diffuse, specular,
+      constant, linear, quadratic,
+      cut_off, outer_cut_off);
+
+  struct Lighting {
+    std::vector<Light> directional;
+    std::vector<Light> positioned;
+    std::vector<Light> spot;
+    Light camera;
+  };
+
+  ENROLL_COMPONENT(Lighting, directional, positioned, spot, camera);
+
+  struct Camera {
+    glm::vec3 position{0.0f, 0.0f, 3.0f};
+    glm::vec3 front{0.0f, 0.0f, -1.0f};
+    glm::vec3 up{0.0f, 1.0f, 0.0f};
+    glm::vec3 direction{0.0f, 0.0f, 0.0f};
+    float movement_speed = 20.0f;
+  };
+
+  ENROLL_COMPONENT(Camera, position, front, up, direction, movement_speed);
+
+  struct Model {
+    std::string directory;
+    std::string model_path;
+  };
+
+  ENROLL_COMPONENT(Model, directory, model_path);
+
+  using Position = glm::vec3;
+
+  struct Thing {
+    std::string model;
+    Position position;
+    std::string material;
+  };
+
+  ENROLL_COMPONENT(Thing, model, position, material);
+
+  struct Shader {
+    std::string vertex_path;
+    std::string frag_path;
+  };
+
+  ENROLL_COMPONENT(Shader, vertex_path, frag_path);
+
+  struct Scene {
+    components::Shader shader;
+    components::Shader light_shader;
+    std::map<std::string, Material> materials;
+    std::map<std::string, Model> models;
+    std::vector<Thing> things;
+    Camera camera;
+    Lighting light;
+  };
+
+  ENROLL_COMPONENT(Scene, shader, light_shader, materials, models, things, camera, light);
+}
diff --git a/16-scene-refactor/src/data.hpp b/16-scene-refactor/src/data.hpp
deleted file mode 100644
index 7b4bbf6..0000000
--- a/16-scene-refactor/src/data.hpp
+++ /dev/null
@@ -1,4 +0,0 @@
-#pragma once
-#include <glm/glm.hpp>
-
-#define CUBE_COUNT 9
diff --git a/16-scene-refactor/src/json.hpp b/16-scene-refactor/src/json.hpp
new file mode 100644
index 0000000..02d0eb7
--- /dev/null
+++ b/16-scene-refactor/src/json.hpp
@@ -0,0 +1,59 @@
+#pragma once
+#include <nlohmann/json.hpp>
+#include <nlohmann/json_fwd.hpp>
+#include <optional>
+#include <glm/glm.hpp>
+#include <vector>
+
+#define ENROLL_COMPONENT(COMPONENT, ...)                         \
+    NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(COMPONENT, __VA_ARGS__);  \
+    template <> struct NameOf<COMPONENT> {                       \
+      static constexpr const char *name = #COMPONENT;            \
+    };
+
+// partial specialization (full specialization works too)
+namespace nlohmann {
+
+  template <>
+  struct adl_serializer<glm::vec3> {
+    static void to_json(json& j, const glm::vec3& opt) {
+
+    }
+
+    static void from_json(const json& j, glm::vec3& opt) {
+      opt = glm::vec3(j[0], j[1], j[2]);
+    }
+  };
+
+  template <typename T>
+    struct adl_serializer<std::optional<T>> {
+      static void to_json(json& j, const std::optional<T>& opt) {
+        if (opt == std::nullopt) {
+          j = nullptr;
+        } else {
+          j = *opt; // this will call adl_serializer<T>::to_json which will
+          // find the free function to_json in T's namespace!
+        }
+      }
+
+      static void from_json(const json& j, std::optional<T>& opt) {
+        if (j.is_null() || j == false) {
+          opt = std::nullopt;
+        } else {
+          opt = std::make_optional<T>(j.template get<T>());
+          // same as above, but with adl_serializer<T>::from_json
+        }
+      }
+    };
+
+  template<>
+  struct adl_serializer<std::chrono::milliseconds> {
+      static void to_json(json& j, const std::chrono::milliseconds& opt) {
+        j = opt.count();
+      }
+
+      static void from_json(const json& j, std::chrono::milliseconds& opt) {
+        opt = std::chrono::milliseconds{int(j)};
+      }
+  };
+}
diff --git a/16-scene-refactor/src/main.cpp b/16-scene-refactor/src/main.cpp
index 323f733..5340edc 100644
--- a/16-scene-refactor/src/main.cpp
+++ b/16-scene-refactor/src/main.cpp
@@ -1,10 +1,9 @@
 #define _USE_MATH_DEFINES
 #include <stb_image.h>
 #include "scene.hpp"
-
+#include "utils.hpp"
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);
 
-
 void init_glfw() {
   glfwInit();
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
@@ -67,25 +66,23 @@ void process_input(GLFWwindow *window, Scene& scene) {
   }
 
   if(glfwGetKey(window, GLFW_KEY_L) == GLFW_PRESS) {
-    scene.light.directional.adjust(-0.01f);
+    for(auto& light : scene.light.directional) {
+      light.adjust(-0.01f);
+    }
   }
 
   if(glfwGetKey(window, GLFW_KEY_P) == GLFW_PRESS) {
-    scene.light.directional.adjust(0.01f);
+    for(auto& light : scene.light.directional) {
+      light.adjust(0.01f);
+    }
   }
 }
 
 Scene setup() {
   glEnable(GL_DEPTH_TEST);
 
-  Scene scene{
-    .shader={"shaders/14-vert.glsl", "shaders/14-frag.glsl"},
-    .lightShader={"shaders/14-vert.glsl", "shaders/14-lightsource.frag.glsl"},
-    .models={
-      {"assets", "crate.obj"}
-    },
-  };
-
+  components::Scene config = utils::load_scene_config("config.json");
+  Scene scene(config);
   scene.configure();
 
   return scene;
diff --git a/16-scene-refactor/src/model.hpp b/16-scene-refactor/src/model.hpp
index efbfc42..79af923 100644
--- a/16-scene-refactor/src/model.hpp
+++ b/16-scene-refactor/src/model.hpp
@@ -19,10 +19,10 @@
 #include <vector>
 
 struct Model {
-  std::map<std::string, Texture> textures_loaded;
-  std::vector<Mesh> meshes;
   std::string directory;
   std::string model_path;
+  std::map<std::string, Texture> textures_loaded;
+  std::vector<Mesh> meshes;
   TextureCounts texture_counts;
   bool gammaCorrection;
 
diff --git a/16-scene-refactor/src/physics.cpp b/16-scene-refactor/src/physics.cpp
deleted file mode 100644
index daa8f87..0000000
--- a/16-scene-refactor/src/physics.cpp
+++ /dev/null
@@ -1,49 +0,0 @@
-#include "physics.hpp"
-
-struct BoxTest Box2d_setup(b2World &world) {
-  BoxTest box;
-  float wall_x[4] = {0.0f, 0.0f, -0.99f, 0.99f};
-  float wall_y[4] = {-0.99, 0.99f, 0.0f, 0.0f};
-  float bound_w[4] = {1.0f, 1.0f, 0.1f, 0.1f};
-  float bound_h[4] = {0.1f, 0.1f, 1.0f, 1.0f};
-
-  for(size_t i = 0; i < 4; i++) {
-    b2BodyDef groundBodyDef;
-    groundBodyDef.position.Set(wall_x[i], wall_y[i]);
-    b2Body *groundBody = world.CreateBody(&groundBodyDef);
-
-    b2PolygonShape groundBox;
-    groundBox.SetAsBox(bound_w[i], bound_h[i]);
-    groundBody->CreateFixture(&groundBox, 1.0f);
-
-    box.walls[i] = groundBody;
-  }
-
-  for(size_t i = 0; i < BODY_COUNT; i++) {
-    b2BodyDef bodyDef;
-    bodyDef.type = b2_dynamicBody;
-    bodyDef.position.Set(0.0f, 0.5f);
-    box.bodies[i] = world.CreateBody(&bodyDef);
-
-    b2PolygonShape dynamicBox;
-    dynamicBox.SetAsBox(0.1f, 0.1f);
-    b2FixtureDef fixtureDef;
-    fixtureDef.shape = &dynamicBox;
-
-    fixtureDef.density = 1.0f;
-    fixtureDef.friction = 0.3f;
-
-    box.bodies[i]->CreateFixture(&fixtureDef);
-  }
-
-  return box;
-}
-
-void Box2d_step_world(b2World& world) {
-  float timeStep = 1.0f / 60.0f;
-  int velocityIterations = 6;
-  int positionIterations = 2;
-
-  // step the world
-  world.Step(timeStep, velocityIterations, positionIterations);
-}
diff --git a/16-scene-refactor/src/physics.hpp b/16-scene-refactor/src/physics.hpp
deleted file mode 100644
index dc98a31..0000000
--- a/16-scene-refactor/src/physics.hpp
+++ /dev/null
@@ -1,13 +0,0 @@
-#pragma once
-
-#include <box2d/box2d.h>
-
-#define BODY_COUNT 1
-
-struct BoxTest {
-  b2Body *walls[4];
-  b2Body *bodies[BODY_COUNT];
-};
-
-struct BoxTest Box2d_setup(b2World &world);
-void Box2d_step_world(b2World& world);
diff --git a/16-scene-refactor/src/scene.cpp b/16-scene-refactor/src/scene.cpp
index 5988433..2ccb104 100644
--- a/16-scene-refactor/src/scene.cpp
+++ b/16-scene-refactor/src/scene.cpp
@@ -8,18 +8,16 @@ void Scene::updateDelta() {
   lastFrame = currentFrame;
 }
 
-
 void Scene::configure() {
   // REFACTOR: really this should be done somewhere else
-  for(auto& model : models) {
+  for(auto& [name, model] : models) {
     model.connect_shader(shader);
   }
 }
 
-void Scene::draw_model(Model& scene_model, glm::mat4& projection, glm::mat4& view, glm::vec3& position)
+void Scene::draw_model(Model& scene_model, Material& material, glm::mat4& projection, glm::mat4& view, glm::vec3& position)
 {
-  glm::vec3 objectColor = {1.0, 0.94, 0.78};
-  shader.apply_material(cubeMaterial);
+  shader.apply_material(material);
 
   float time = glfwGetTime();
   glm::mat4 model = glm::mat4(1.0f);
@@ -51,15 +49,15 @@ void Scene::render(GLFWwindow* window) {
   shader.use();
   shader.setMat4("view", view);
   shader.setMat4("projection", projection);
-  shader.setVec3("viewPos", camera.pos);
+  shader.setVec3("viewPos", camera.position);
 
-  light.spot.position = camera.pos;
-  light.spot.direction = camera.front;
+  light.camera.position = camera.position;
+  light.camera.direction = camera.front;
   shader.apply_lighting(light);
 
   // BUG: no connection between models and positions
-  for(auto& position : positions) {
-    draw_model(models[0], projection, view, position);
+  for(auto& thing : things) {
+    draw_model(thing.model, thing.material, projection, view, thing.position);
   }
 }
 
diff --git a/16-scene-refactor/src/scene.hpp b/16-scene-refactor/src/scene.hpp
index c92b954..828c75e 100644
--- a/16-scene-refactor/src/scene.hpp
+++ b/16-scene-refactor/src/scene.hpp
@@ -10,98 +10,55 @@
 #include "shader.hpp"
 #include "model.hpp"
 #include "camera.hpp"
-#include "scene.hpp"
+#include "components.hpp"
 #include <vector>
 
-const unsigned int SCR_WIDTH = 800;
-const unsigned int SCR_HEIGHT = 600;
-
-const float AMBIENT_LEVEL = 0.25f;
+struct Thing {
+  Model& model;
+  components::Position position;
+  Material& material;
+};
 
 struct Scene {
   Shader shader;
-  Shader lightShader;
-  std::vector<Model> models;
-
-  Lighting light{
-    .directional={
-      .direction={-0.2f, -1.0f, -0.3f},
-      .ambient={0.2f, 0.2f, 0.2f},
-      .diffuse={0.8f, 0.8f, 0.8f},
-      .specular={1.0f, 1.0f, 1.0f},
-    },
-    .positioned={
-      {
-        .position={1.2f, 1.0f, 2.0f},
-        .direction={-0.2f, -1.0f, -0.3f},
-        .ambient={0.2f, 0.2f, 0.2f},
-        .diffuse={0.8f, 0.8f, 0.8f},
-        .specular={1.0f, 1.0f, 1.0f},
-        .constant=1.0f,
-        .linear=0.09f,
-        .quadratic=0.032f,
-        .cutOff=12.5f,
-        .outerCutOff=17.5f,
-      },
-      {
-        .position={-1.2f, -1.0f, -2.0f},
-        .direction={0.2f, 1.0f, 0.3f},
-        .ambient={0.2f, 0.2f, 0.2f},
-        .diffuse={0.8f, 0.8f, 0.8f},
-        .specular={1.0f, 1.0f, 1.0f},
-        .constant=1.0f,
-        .linear=0.09f,
-        .quadratic=0.032f,
-        .cutOff=12.5f,
-        .outerCutOff=17.5f,
-      },
-    },
-    .spot={
-      .position={2.2f, 1.0f, 2.0f},
-      .direction={0.0f, 0.0f, -1.0f},
-      .ambient={0.2f, 0.2f, 0.2f},
-      .diffuse={0.8f, 0.8f, 0.8f},
-      .specular={1.0f, 1.0f, 1.0f},
-      .constant=1.0f,
-      .linear=0.09f,
-      .quadratic=0.032f,
-      .cutOff=12.5f,
-      .outerCutOff=17.5f,
-    },
-  };
-
-  // positions all containers
-  std::vector<glm::vec3> positions{
-      {0.0f,  0.0f,  0.0f},
-      {2.0f,  5.0f, -15.0f},
-      {-1.5f, -2.2f, -2.5f},
-      {-3.8f, -2.0f, -12.3f},
-      { 2.4f, -0.4f, -3.5f},
-      {-1.7f,  3.0f, -7.5f},
-      { 1.3f, -2.0f, -2.5f},
-      { 1.5f,  2.0f, -2.5f},
-      { 1.5f,  0.2f, -1.5f},
-      {-1.3f,  1.0f, -1.5f}
-  };
-
-  Camera camera{
-    .pos={2.2f, 1.0f, 2.0f},
-    .movementSpeed=2.0f
-  };
-
-  Material cubeMaterial{
-    .ambient = {1.0f, 0.5f, 0.31f},
-    .shininess = 32.0f,
-    .diffuseMap = 0,
-    .specularMap = 0,
-  };
+  Shader light_shader;
+  std::map<std::string, components::Material> materials;
+  Camera camera;
+  components::Lighting light;
+  std::map<std::string, Model> models;
+  std::vector<Thing> things;
 
   float deltaTime = 0.0f;
   float lastFrame = 0.0f;
 
+  Scene(components::Scene& config):
+    shader{config.shader.vertex_path, config.shader.frag_path},
+    light_shader{config.light_shader.vertex_path, config.shader.frag_path},
+    materials{config.materials},
+    camera{
+      .position=config.camera.position,
+      .front=config.camera.front,
+      .up=config.camera.up,
+      .direction=config.camera.direction,
+      .movement_speed=config.camera.movement_speed,
+    },
+    light{config.light}
+  {
+    for(auto& [name, model] : config.models) {
+      models.try_emplace(name, model.directory, model.model_path);
+    }
+
+    for(auto& thing : config.things) {
+      things.emplace_back(
+          models.at(thing.model),
+          thing.position,
+          materials.at(thing.material));
+    }
+  }
+
   void updateDelta();
   void configure();
-  void draw_model(Model& scene_model, glm::mat4& projection, glm::mat4& view, glm::vec3& position);
+  void draw_model(Model& scene_model, Material& material, glm::mat4& projection, glm::mat4& view, glm::vec3& position);
   void render(GLFWwindow* window);
   void cleanup();
 };
diff --git a/16-scene-refactor/src/shader.cpp b/16-scene-refactor/src/shader.cpp
index c49d36e..0937d7d 100644
--- a/16-scene-refactor/src/shader.cpp
+++ b/16-scene-refactor/src/shader.cpp
@@ -60,7 +60,7 @@ unsigned int Shader::load_shader(const std::string& filename, GLenum shader_type
   return shader_id;
 }
 
-Shader::Shader(const char* vertexPath, const char* fragmentPath) {
+Shader::Shader(const std::string& vertexPath, const std::string& fragmentPath) {
   unsigned int vertex = load_shader(vertexPath, GL_VERTEX_SHADER);
   unsigned int fragment = load_shader(fragmentPath, GL_FRAGMENT_SHADER);
 
@@ -131,27 +131,42 @@ void Shader::apply_material(const Material& material) {
 }
 
 void Shader::apply_lighting(const Lighting& lighting) {
-  apply_dir_light(lighting.directional);
-
   setInt("pointLightCount", lighting.positioned.size());
+  setInt("dirLightCount", lighting.directional.size());
+
+  // need +1 for the camera spot light
+  setInt("spotLightCount", lighting.spot.size() + 1);
+
+  for(size_t i = 0; i < lighting.directional.size(); i++) {
+    apply_dir_light(lighting.directional[i], i);
+  }
 
   for(size_t i = 0; i < lighting.positioned.size(); i++) {
     apply_point_light(lighting.positioned[i], i);
   }
 
-  apply_spot_light(lighting.spot);
+  // set the first spotlight to the camera light
+  apply_spot_light(lighting.camera, 0);
+
+  for(size_t i = 0; i < lighting.spot.size(); i++) {
+    // need to be off by one because the camera is a spot light
+    apply_spot_light(lighting.spot[i], i+1);
+  }
 }
 
-void Shader::apply_dir_light(const Light& light) {
-  setVec3("dirLight.direction", light.direction);
-  setVec3("dirLight.ambient", light.ambient);
-  setVec3("dirLight.diffuse", light.diffuse);
-  setVec3("dirLight.specular", light.specular);
+void Shader::apply_dir_light(const Light& light, size_t index) {
+  dbc::check(index < MAX_LIGHTS, "too many directional lights");
+
+  setVec3(std::format("dirLights[{}].direction", index), light.direction);
+  setVec3(std::format("dirLights[{}].ambient", index), light.ambient);
+  setVec3(std::format("dirLights[{}].diffuse", index), light.diffuse);
+  setVec3(std::format("dirLights[{}].specular", index), light.specular);
 }
 
 void Shader::apply_point_light(const Light& light, size_t index) {
-  dbc::check(index < NR_POINT_LIGHTS, "too many positioned lights");
+  dbc::check(index < MAX_LIGHTS, "too many positioned lights");
 
+  // disgusting, crafting a string on every render?
   setVec3(std::format("pointLights[{}].position", index), light.position);
   setVec3(std::format("pointLights[{}].ambient", index), light.ambient);
   setVec3(std::format("pointLights[{}].diffuse", index), light.diffuse);
@@ -162,15 +177,17 @@ void Shader::apply_point_light(const Light& light, size_t index) {
   setFloat(std::format("pointLights[{}].quadratic", index), light.quadratic);
 }
 
-void Shader::apply_spot_light(const Light& light) {
-  setVec3("spotLight.position", light.position);
-  setVec3("spotLight.direction", light.direction);
-  setVec3("spotLight.ambient", light.ambient);
-  setVec3("spotLight.diffuse", light.diffuse);
-  setVec3("spotLight.specular", light.specular);
-  setFloat("spotLight.constant",  light.constant);
-  setFloat("spotLight.linear",    light.linear);
-  setFloat("spotLight.quadratic", light.quadratic);
-  setFloat("spotLight.cutOff", glm::cos(glm::radians(light.cutOff)));
-  setFloat("spotLight.outerCutOff", glm::cos(glm::radians(light.outerCutOff)));
+void Shader::apply_spot_light(const Light& light, size_t index) {
+  dbc::check(index < MAX_LIGHTS, "too many spot lights");
+
+  setVec3(std::format("spotLights[{}].position", index), light.position);
+  setVec3(std::format("spotLights[{}].direction", index), light.direction);
+  setVec3(std::format("spotLights[{}].ambient", index), light.ambient);
+  setVec3(std::format("spotLights[{}].diffuse", index), light.diffuse);
+  setVec3(std::format("spotLights[{}].specular", index), light.specular);
+  setFloat(std::format("spotLights[{}].constant", index),  light.constant);
+  setFloat(std::format("spotLights[{}].linear", index),    light.linear);
+  setFloat(std::format("spotLights[{}].quadratic", index), light.quadratic);
+  setFloat(std::format("spotLights[{}].cut_off", index), glm::cos(glm::radians(light.cut_off)));
+  setFloat(std::format("spotLights[{}].outer_cut_off", index), glm::cos(glm::radians(light.outer_cut_off)));
 }
diff --git a/16-scene-refactor/src/shader.hpp b/16-scene-refactor/src/shader.hpp
index 87c99ce..594dd0d 100644
--- a/16-scene-refactor/src/shader.hpp
+++ b/16-scene-refactor/src/shader.hpp
@@ -7,48 +7,16 @@
 #include <vector>
 #include <format>
 #include "dbc.hpp"
+#include "components.hpp"
 
-struct Material {
-  glm::vec3 ambient{0.1f,0.1f,0.1f};
-  float shininess{32.0f};
-  unsigned int diffuseMap = 0;
-  unsigned int specularMap = 0;
-};
-
-struct Light {
-  glm::vec3 position{0.0f, 0.0f, 0.0f};
-  glm::vec3 direction{0.0f, 0.0f, 0.0f};
-  glm::vec3 ambient{0.0f, 0.0f, 0.0f};
-  glm::vec3 diffuse{0.0f, 0.0f, 0.0f};
-  glm::vec3 specular{0.0f, 0.0f, 0.0f};
-  float constant=0.0f;
-  float linear=0.0f;
-  float quadratic=0.0f;
-  float cutOff=0.0f;
-  float outerCutOff=0.0f;
-
-  void adjust(float amount) {
-    ambient += amount;
-    diffuse += amount;
-    specular += amount;
-  }
-};
-
-
-#define NR_POINT_LIGHTS 4
-
-struct Lighting {
-  Light directional;
-  std::vector<Light> positioned;
-  Light spot;
-};
+using components::Material, components::Lighting, components::Light;
 
 class Shader
 {
 public:
   unsigned int ID = UINT_MAX;
 
-  Shader(const char* vertexPath, const char* fragmentPath);
+  Shader(const std::string& vertexPath, const std::string& fragmentPath);
   unsigned int load_shader(const std::string& filename, GLenum shader_type);
   void use() const;
   void setBool(const std::string &name, bool value) const;
@@ -63,7 +31,7 @@ public:
 
   void apply_material(const Material& material);
   void apply_lighting(const Lighting& lighting);
-  void apply_dir_light(const Light& light);
+  void apply_dir_light(const Light& light, size_t index);
   void apply_point_light(const Light& light, size_t index);
-  void apply_spot_light(const Light& light);
+  void apply_spot_light(const Light& light, size_t index);
 };
diff --git a/16-scene-refactor/src/utils.cpp b/16-scene-refactor/src/utils.cpp
new file mode 100644
index 0000000..c978e79
--- /dev/null
+++ b/16-scene-refactor/src/utils.cpp
@@ -0,0 +1,11 @@
+#include <fstream>
+#include "json.hpp"
+#include "utils.hpp"
+
+namespace utils {
+  components::Scene load_scene_config(const std::string& config_file) {
+    std::ifstream f{"config.json"};
+    auto j = json::parse(f);
+    return j["scene"].template get<components::Scene>();
+  }
+}
diff --git a/16-scene-refactor/src/utils.hpp b/16-scene-refactor/src/utils.hpp
new file mode 100644
index 0000000..6bde00d
--- /dev/null
+++ b/16-scene-refactor/src/utils.hpp
@@ -0,0 +1,9 @@
+#pragma once
+
+#include "components.hpp"
+
+using json = nlohmann::json;
+
+namespace utils {
+  components::Scene load_scene_config(const std::string& config_file);
+}
diff --git a/16-scene-refactor/tests/config.json b/16-scene-refactor/tests/config.json
new file mode 100644
index 0000000..47d9449
--- /dev/null
+++ b/16-scene-refactor/tests/config.json
@@ -0,0 +1,74 @@
+{
+  "material_test": {
+    "ambient": [0.1, 0.1, 0.1],
+    "shininess": 32.0,
+    "diffuseMap": 0,
+    "specularMap": 0
+  },
+  "lighting_test": {
+    "directional": [
+      {
+        "position": [0, 0, 0.0],
+        "direction":[-0.2, -1.0, -0.3],
+        "ambient":[0.2, 0.2, 0.2],
+        "diffuse":[0.8, 0.8, 0.8],
+        "specular":[1.0, 1.0, 1.0],
+        "constant": 0.0,
+        "linear": 0.0,
+        "quadratic": 0.0,
+        "cut_off": 0.0,
+        "outer_cut_off": 0.0
+      }
+    ],
+    "positioned": [
+      {
+        "position": [1.2, 1.0, 2.0],
+        "direction":[-0.2, -1.0, -0.3],
+        "ambient":[0.2, 0.2, 0.2],
+        "diffuse":[0.8, 0.8, 0.8],
+        "specular":[1.0, 1.0, 1.0],
+        "constant": 1.0,
+        "linear": 0.09,
+        "quadratic": 0.032,
+        "cut_off": 12.5,
+        "outer_cut_off": 17.5
+      }
+    ],
+    "spot": [
+
+    ],
+    "camera": {
+        "position":[2.2, 1.0, 2.0],
+        "direction":[0.0, 0.0, -1.0],
+        "ambient":[0.2, 0.2, 0.2],
+        "diffuse":[0.8, 0.8, 0.8],
+        "specular":[1.0, 1.0, 1.0],
+        "constant": 1.0,
+        "linear": 0.09,
+        "quadratic": 0.032,
+        "cut_off": 12.5,
+        "outer_cut_off": 17.5
+    }
+  },
+
+  "camera_test": {
+    "position": [0.0, 0.0, 3.0],
+    "front": [0.0, 0.0, -1.0],
+    "up": [0.0, 1.0, 0.0],
+    "direction": [0.0, 0.0, 0.0],
+    "movement_speed": 20.0
+  },
+  "model_test": {
+    "directory": "assets",
+    "model_path": "create.obj"
+  },
+  "thing_test": {
+    "model": "crate",
+    "position": [0.0, 0.0, 0.0],
+    "material": "crate"
+  },
+  "shader_test": {
+    "vertex_path": "shaders/16-vert.glsl",
+    "frag_path": "shaders/16-frag.glsl"
+  }
+}
diff --git a/16-scene-refactor/tests/config_tests.cpp b/16-scene-refactor/tests/config_tests.cpp
new file mode 100644
index 0000000..dbb22da
--- /dev/null
+++ b/16-scene-refactor/tests/config_tests.cpp
@@ -0,0 +1,46 @@
+#include <fuc2/testing.hpp>
+#include "components.hpp"
+#include <fstream>
+#include "json.hpp"
+
+#include <nlohmann/json.hpp>
+using json = nlohmann::json;
+
+using namespace fuc2;
+
+/*
+ * This also tests Mesh by using Model to load them.
+ */
+namespace config_tests {
+  void test_json_components() {
+    std::ifstream f{"tests/config.json"};
+    auto j = json::parse(f);
+    auto mat = j["material_test"].get<components::Material>();
+
+    CHECK(mat.ambient.x == 0.1f, "wrong value");
+
+    auto light = j["lighting_test"].get<components::Lighting>();
+
+    auto camera = j["camera_test"].get<components::Camera>();
+
+    auto model = j["model_test"].get<components::Model>();
+
+    auto thing = j["thing_test"].get<components::Thing>();
+  }
+
+
+  void test_load_json_config() {
+    std::ifstream f{"config.json"};
+    auto j = json::parse(f);
+    auto scene = j["scene"].get<components::Scene>();
+  }
+
+  fuc2::Set TESTS{
+    .name="config",
+      .options={ .fail_fast=false },
+      .tests={
+        TEST(test_json_components),
+        TEST(test_load_json_config),
+      }
+  };
+}
diff --git a/16-scene-refactor/tests/main.cpp b/16-scene-refactor/tests/main.cpp
index a401b6b..d7f31cb 100644
--- a/16-scene-refactor/tests/main.cpp
+++ b/16-scene-refactor/tests/main.cpp
@@ -5,6 +5,7 @@
 
 TEST_SET(shader_tests);
 TEST_SET(model_tests);
+TEST_SET(config_tests);
 
 using namespace fuc2;
 
@@ -33,7 +34,8 @@ int main(int argc, char* argv[]) {
 
   std::vector<fuc2::Set> tests{
       shader_tests::TESTS,
-      model_tests::TESTS
+      model_tests::TESTS,
+      config_tests::TESTS,
   };
 
   return run_tests(tests, argc, argv);
diff --git a/16-scene-refactor/tests/meson.build b/16-scene-refactor/tests/meson.build
index 877a6d3..f327eb3 100644
--- a/16-scene-refactor/tests/meson.build
+++ b/16-scene-refactor/tests/meson.build
@@ -2,4 +2,5 @@ fuc2_tests = files(
   'main.cpp',
   'shader_tests.cpp',
   'model_tests.cpp',
+  'config_tests.cpp',
 )
diff --git a/16-scene-refactor/wraps/nlohmann_json.wrap b/16-scene-refactor/wraps/nlohmann_json.wrap
new file mode 100644
index 0000000..8c46676
--- /dev/null
+++ b/16-scene-refactor/wraps/nlohmann_json.wrap
@@ -0,0 +1,11 @@
+[wrap-file]
+directory = nlohmann_json-3.11.3
+lead_directory_missing = true
+source_url = https://github.com/nlohmann/json/releases/download/v3.11.3/include.zip
+source_filename = nlohmann_json-3.11.3.zip
+source_hash = a22461d13119ac5c78f205d3df1db13403e58ce1bb1794edc9313677313f4a9d
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/nlohmann_json_3.11.3-1/nlohmann_json-3.11.3.zip
+wrapdb_version = 3.11.3-1
+
+[provide]
+nlohmann_json = nlohmann_json_dep