1 files changed, 12 insertions, 0 deletions
diff --git a/gfx/lightDirection.cpp b/gfx/lightDirection.cpp
new file mode 100644
index 0000000..3932872
--- /dev/null
+++ b/gfx/lightDirection.cpp
@@ -0,0 +1,12 @@
+#include "lightDirection.h"
+#include "maths.h"
+
+constexpr auto ASTRONOMICAL_TWILIGHT = 18.0_degrees;
+constexpr auto SUN_ANGLUAR_SIZE = 0.5_degrees;
+
+LightDirection::LightDirection(const Direction2D sunPos) :
+	pos {sunPos}, vec {glm::mat3 {rotate_yp(pi + sunPos.x, -sunPos.y)} * north},
+	amb {glm::clamp(sunPos.y + ASTRONOMICAL_TWILIGHT, 0.F, 1.F)},
+	dir {glm::clamp(sunPos.y + SUN_ANGLUAR_SIZE, 0.F, 1.F)}
+{
+}