Switch to using tangent normals

src/main.c

@@ -33,14 +33,14 @@ int main(void) {
   }
 
   Model obj = load_obj_file(arena, RESOURCE("head.obj"), RESOURCE("head.pnm"),
-                            RESOURCE("head_nm.pnm"));
+                            RESOURCE("head_nm_tangent.pnm"));
   if (IS_INVALID_MODEL(obj)) {
     return TINY_EXIT_MODEL_LOAD_FAILED;
   }
 
   PhongMaterial material = {
-      .ambient = 0.1f,
-      .diffuse = 1.2f,
+      .ambient = 0.3f,
+      .diffuse = 1.0f,
       .specular = 0.1f,
       .shininess = 0.8f,
   };

src/shader/shaders.c

@@ -25,7 +25,7 @@ internal V3f g_ambient_light = {0.6f, 0.45f, 0.55f};
 internal DirectionalLight g_directional_light = {
     .diffuse_intensity = {0.9f, 1.0f, 1.0f},
     .specular_intensity = {1.0f, 0.8f, 2.0f},
-    .direction = {0.0f, 0.0f, 1.5f},
+    .direction = {0.0f, 0.0f, 1.45f},
 };
 internal V3f g_eye = {0.2f, 0.1f, 0.75f};
 internal V3f g_target = {0};