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world_sun_direction/README.md

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+Sky Texture synchronized with light direction.  
+
+### Keyboard
+
+- `1` HosekWilkie
+- `2` Nishita

world_sun_direction/Sources/lnx/MyTrait.hx

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+package lnx;
+
+import leenkx.renderpath.HosekWilkie;
+import leenkx.renderpath.Nishita;
+import iron.Scene;
+import iron.math.Vec4;
+import iron.system.Input;
+
+class MyTrait extends iron.Trait {
+	public function new() {
+		super();
+		notifyOnInit(function() {
+			
+			var world = Scene.active.world;
+			var center = Scene.active.getEmpty('Center');
+			var light = Scene.active.lights[0];
+			var keyboard = Input.getKeyboard();
+			var model = 'hosekwilkie';
+			notifyOnUpdate(function() {
+				
+				if (keyboard.started("1")) Scene.setActive('Scene_'+(model = 'hosekwilkie'));
+				if (keyboard.started("2")) Scene.setActive('Scene_'+(model = 'nishita'));
+
+				center.transform.rotate(Vec4.xAxis(),0.02);
+
+				// Sync sun direction
+				var v = light.look();
+				world.raw.sun_direction[0] = v.x;
+				world.raw.sun_direction[1] = v.y;
+				world.raw.sun_direction[2] = v.z;
+
+				switch model {
+				case 'hosekwilkie': HosekWilkie.recompute(world);
+				case 'nishita': Nishita.recompute(world);
+				}
+	
+				// Set world strength
+				// world.getGlobalProbe().raw.strength = 1.0;
+			});
+		});
+	}
+}