Switch to using tangent normals

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};