Fix dielectric materials refraction

3 files changed, 4 insertions, 4 deletions

diff --git a/include/hittable.hpp b/include/hittable.hpp
index aa55034..074de55 100644
--- a/include/hittable.hpp
+++ b/include/hittable.hpp
@@ -16,7 +16,7 @@ struct hit_info {
 
     inline void set_face_normal(const ray& r, const vec3& outward_normal) {
         front_face = r.direction.dot(outward_normal) < 0.0;
-        normal = front_face ? outward_normal : -outward_normal;
+        normal = front_face ? outward_normal : (-outward_normal);
     }
 };
 
diff --git a/src/main.cpp b/src/main.cpp
index 92dc01f..41f1280 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -35,7 +35,7 @@ int main() {
     const uint32_t samples_per_pixel = 100;
     const uint32_t max_depth = 100;
 
-    camera camera { { /*-2.0, 2.0, 1.0*/ }, { 0.0, 0.0, -1.0 }, 90.0, aspect_ratio };
+    camera camera { { -2.0, 2.0, 1.0 }, { 0.0, 0.0, -1.0 }, 20.0, aspect_ratio };
 
     // World hittable objects
     hittable_list world {};
@@ -48,7 +48,7 @@ int main() {
     world.add(std::make_shared<sphere>(point3( 0.0, -100.5, -1.0), 100.0, material_ground));
     world.add(std::make_shared<sphere>(point3( 0.0,    0.0, -1.0),   0.5, material_center));
     world.add(std::make_shared<sphere>(point3(-1.0,    0.0, -1.0),   0.5, material_left));
-    world.add(std::make_shared<sphere>(point3(-1.0,    0.0, -1.0),  -0.4, material_left));
+    world.add(std::make_shared<sphere>(point3(-1.0,    0.0, -1.0),  -0.49, material_left));
     world.add(std::make_shared<sphere>(point3( 1.0,    0.0, -1.0),   0.5, material_right));
 
     // PPM format header
diff --git a/src/sphere.cpp b/src/sphere.cpp
index 611dc34..e7be715 100644
--- a/src/sphere.cpp
+++ b/src/sphere.cpp
@@ -32,7 +32,7 @@ bool sphere::hit(const ray& r, double t_min, double t_max, struct hit_info& info
     info.point = r.at(t);
     info.mat_ptr = mat_ptr;
 
-    vec3 out_normal = (info.point - center).unit();
+    vec3 out_normal = (info.point - center) / radius;
     info.set_face_normal(r, out_normal);
 
     return true;