void setupScene()
{
	camera.pos.set(45, 120, -300);
	camera.yaw = 5;
	camera.pitch = -5;
	camera.fov = 80;
	camera.beginFrame();
	// create the floor:
	Plane* plane = new Plane(-0.01);
	plane->limit = 200;
	CheckerTexture* checker = new CheckerTexture(Color(0xdfb786), Color(0xd1a372));
	nodes.push_back(Node{ plane, new Lambert(Color(1, 1, 1), checker)});
	// create the window "frame":
	Phong* red = new Phong(Color(0.9, 0.3, 0.1), Color(1, 1, 1), 15.0f);
	Cube* cube = new Cube(Vector(0, 0, 0), 3.0);
	cube->beginFrame();
	auto makeWindowNode = [red, cube] (Vector scale, Vector translate, double rotyaw = 0) -> Node {
		Node n{cube, red};
		n.T.scale(scale.x, scale.y, scale.z);
		if (rotyaw != 0) n.T.rotate(rotyaw, 0, 0);
		n.T.translate(translate);
		return n;
	};
	nodes.push_back(makeWindowNode(Vector(1, 60, 1), Vector(-89, 95, 7.84)));
	nodes.push_back(makeWindowNode(Vector(1, 60, 1), Vector(  0, 95,    0)));
	nodes.push_back(makeWindowNode(Vector(1, 60, 1), Vector(+89, 95,-7.84)));
	nodes.push_back(makeWindowNode(Vector(60, 1, 1), Vector(  0,185,    0), -5));
	nodes.push_back(makeWindowNode(Vector(60, 1, 1), Vector(  0, 95,    0), -5));
	nodes.push_back(makeWindowNode(Vector(60, 1, 1), Vector(  0,  5,    0), -5));
	// a glass shader:
	Layered* glass = new Layered;
	Refraction* refr = new Refraction();
	refr->refrColor = Color(1, 1, 1) * 0.95;
	refr->ior = 1.45;
	glass->addLayer(refr);
	Fresnel* fresnel = new Fresnel;
	fresnel->ior = refr->ior;
	glass->addLayer(new Reflection(1.0, Color(1, 1, 1) * 0.85), Color(1, 1, 1), fresnel);
	// the window itself:
	nodes.push_back(Node{cube, glass});
	nodes.back().T.scale(59, 59, 0.75);
	nodes.back().T.rotate(-5, 0, 0);
	nodes.back().T.translate(Vector(0, 95, 0));
	//nodes.back().shadowTransparency = 0.80; /* (*) */
	// two translucent spheres:
	Sphere* sphere = new Sphere(Vector(0, 0, 0), 20);
	auto makeSphereNode = [sphere, glass] (Vector translate, double shadowTransparency) -> Node {
		Node n{sphere, glass};
		n.T.translate(translate);
		//n.shadowTransparency = shadowTransparency; /* (*) */
		return n;
	};
	nodes.push_back(makeSphereNode(Vector(55, 15, -30), 0.66));
	nodes.push_back(makeSphereNode(Vector(105, 15, -30), 0.83));
	lightPos.set(-90, +1500, +750);
	lightColor.setColor(1, 1, 1);
	lightIntensity = 3000000.0;
	//
	environment = new CubemapEnvironment("data/env/forest");
}