Added an initialization-time test to TestScene script for disabling unnecessary shadowcasters.

Bin/Data/Scripts/TestScene.as

@@ -182,7 +182,7 @@ void InitScene()
         StaticModel@ object = objectNode.CreateComponent("StaticModel");
         object.model = cache.GetResource("Model", "Models/Mushroom.mdl");
         object.material = cache.GetResource("Material", "Materials/Mushroom.xml");
-        object.castShadows = true;
+        object.castShadows = CheckInLight(object);
 
         CollisionShape@ shape = objectNode.CreateComponent("CollisionShape");
         shape.SetTriangleMesh(cache.GetResource("Model", "Models/Mushroom.mdl"), 0);
@@ -199,7 +199,7 @@ void InitScene()
         AnimatedModel@ object = objectNode.CreateComponent("AnimatedModel");
         object.model = cache.GetResource("Model", "Models/Jack.mdl");
         object.material = cache.GetResource("Material", "Materials/Jack.xml");
-        object.castShadows = true;
+        object.castShadows = CheckInLight(object);
 
         AnimationController@ ctrl = objectNode.CreateComponent("AnimationController");
         ctrl.Play("Models/Jack_Walk.ani", 0, true, 0.0f);
@@ -218,6 +218,25 @@ void InitScene()
         renderer.viewports[0] = Viewport(testScene, camera);
 }
 
+bool CheckInLight(Drawable@ drawable)
+{
+    // Check for occluders blocking the directional light to this drawable, using a simple raycast test
+    Node@ lightNode = testScene.GetChild("GlobalLight", true);
+    Ray reverseLightRay(drawable.node.position, -lightNode.direction);
+    Array<RayQueryResult> result = testScene.octree.Raycast(reverseLightRay, RAY_TRIANGLE, 250.0, DRAWABLE_GEOMETRY);
+
+    for (uint i = 0; i < result.length; ++i)
+    {
+        Drawable@ otherDrawable = result[i].drawable;
+        if (otherDrawable is drawable)
+            continue;
+        if (otherDrawable.castShadows && otherDrawable.occluder)
+            return false;
+    }
+
+    return true;
+}
+
 void HandleUpdate(StringHash eventType, VariantMap& eventData)
 {
     float timeStep = eventData["TimeStep"].GetFloat();