From 402a75265e34ad4d8eae82a1d89e86b607c6f705 Mon Sep 17 00:00:00 2001
From: "C. J. Howard" <cjhoward@cjhoward.org>
Date: Mon, 13 Sep 2021 17:06:17 +0800
Subject: [PATCH] Add brood state, rename play state to forage state, revise
 and reorganize camera compositors

---
 CMakeLists.txt                           |   1 -
 src/entity/components/camera.hpp         |  37 +++
 src/entity/systems/astronomy.cpp         |  13 +-
 src/entity/systems/control.cpp           |  10 +-
 src/entity/systems/control.hpp           |   4 +-
 src/game/bootloader.cpp                  | 377 +++++++++++------------
 src/game/context.hpp                     |  51 +--
 src/game/states/brood.cpp                |  97 ++++++
 src/game/states/{play.hpp => brood.hpp}  |  12 +-
 src/game/states/{play.cpp => forage.cpp} |  40 ++-
 src/game/states/forage.hpp               |  39 +++
 src/game/states/loading.cpp              |  51 ++-
 src/game/states/nuptial-flight.cpp       |  40 ++-
 src/game/states/splash.cpp               |  14 +-
 src/renderer/passes/sky-pass.cpp         |  83 ++++-
 src/renderer/passes/sky-pass.hpp         |  20 +-
 16 files changed, 616 insertions(+), 273 deletions(-)
 create mode 100644 src/entity/components/camera.hpp
 create mode 100644 src/game/states/brood.cpp
 rename src/game/states/{play.hpp => brood.hpp} (83%)
 rename src/game/states/{play.cpp => forage.cpp} (72%)
 create mode 100644 src/game/states/forage.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index af368e1..d4aa351 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,5 @@
 cmake_minimum_required(VERSION 3.7)
 
-
 option(VERSION_STRING "Project version string" "0.0.0")
 
 project(antkeeper VERSION ${VERSION_STRING} LANGUAGES CXX)
diff --git a/src/entity/components/camera.hpp b/src/entity/components/camera.hpp
new file mode 100644
index 0000000..0d2fd83
--- /dev/null
+++ b/src/entity/components/camera.hpp
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2021  Christopher J. Howard
+ *
+ * This file is part of Antkeeper source code.
+ *
+ * Antkeeper source code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Antkeeper source code is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ANTKEEPER_ENTITY_COMPONENT_CAMERA_HPP
+#define ANTKEEPER_ENTITY_COMPONENT_CAMERA_HPP
+
+#include "scene/camera.hpp"
+
+namespace entity {
+namespace component {
+
+struct flight_controller
+{
+	
+};
+
+} // namespace component
+} // namespace entity
+
+#endif // ANTKEEPER_ENTITY_COMPONENT_CAMERA_HPP
+
diff --git a/src/entity/systems/astronomy.cpp b/src/entity/systems/astronomy.cpp
index 3d60135..458055c 100644
--- a/src/entity/systems/astronomy.cpp
+++ b/src/entity/systems/astronomy.cpp
@@ -177,15 +177,22 @@ void astronomy::update(double t, double dt)
 				)
 			);
 			
+			
+			// Sun color at the outer atmosphere
+			float3 sun_color_outer = math::type_cast<float>(blackbody.luminous_intensity * distance_attenuation);
+			
+			// Sun color at sea level
+			float3 sun_color_inner = math::type_cast<float>(blackbody.luminous_intensity * distance_attenuation * atmospheric_transmittance);
+			
 			// Update blackbody light color and intensity
-			sun_light->set_color(math::type_cast<float>(blackbody.luminous_intensity * atmospheric_transmittance));	
-			sun_light->set_intensity(static_cast<float>(distance_attenuation));
+			sun_light->set_color(sun_color_inner);	
+			sun_light->set_intensity(1.0f);
 			
 			// Upload blackbody params to sky pass
 			if (this->sky_pass)
 			{
 				this->sky_pass->set_sun_position(math::type_cast<float>(blackbody_position_topocentric));
-				this->sky_pass->set_sun_color(math::type_cast<float>(blackbody.luminous_intensity * distance_attenuation));
+				this->sky_pass->set_sun_color(sun_color_outer, sun_color_inner);
 				
 				double blackbody_angular_radius = std::asin((celestial_body.radius * 2.0) / (blackbody_distance * 2.0));
 				this->sky_pass->set_sun_angular_radius(static_cast<float>(blackbody_angular_radius));
diff --git a/src/entity/systems/control.cpp b/src/entity/systems/control.cpp
index cf03f7b..d6a946d 100644
--- a/src/entity/systems/control.cpp
+++ b/src/entity/systems/control.cpp
@@ -37,7 +37,7 @@ control::control(entity::registry& registry):
 	zoom(0.0f),
 	tool(nullptr),
 	flashlight_entity(entt::null),
-	underworld_camera(nullptr)
+	underground_camera(nullptr)
 {
 	control_set.add_control(&move_forward_control);
 	control_set.add_control(&move_back_control);
@@ -186,9 +186,9 @@ void control::update(double t, double dt)
 			
 			command::set_transform(registry, flashlight_entity, flashlight_transform, false);
 			
-			if (underworld_camera)
+			if (underground_camera)
 			{
-				underworld_camera->look_at({0, -flashlight_depth + 50.0f, 0}, {0, -flashlight_depth, 0}, {0, 0, -1});
+				underground_camera->look_at({0, -flashlight_depth + 50.0f, 0}, {0, -flashlight_depth, 0}, {0, 0, -1});
 			}
 		}
 	}
@@ -224,9 +224,9 @@ void control::set_viewport(const float4& viewport)
 	this->viewport = viewport;
 }
 
-void control::set_underworld_camera(scene::camera* camera)
+void control::set_underground_camera(scene::camera* camera)
 {
-	this->underworld_camera = camera;
+	this->underground_camera = camera;
 }
 
 void control::handle_event(const mouse_moved_event& event)
diff --git a/src/entity/systems/control.hpp b/src/entity/systems/control.hpp
index ffa930a..1c0ad83 100644
--- a/src/entity/systems/control.hpp
+++ b/src/entity/systems/control.hpp
@@ -58,7 +58,7 @@ public:
 	void set_camera_subject(entity::id entity_id);
 	
 	void set_viewport(const float4& viewport);
-	void set_underworld_camera(scene::camera* camera);
+	void set_underground_camera(scene::camera* camera);
 
 	input::control_set* get_control_set();
 	input::control* get_move_forward_control();
@@ -148,7 +148,7 @@ private:
 	
 	entity::id flashlight_entity;
 	entity::id camera_subject_entity;
-	scene::camera* underworld_camera;
+	scene::camera* underground_camera;
 	
 	float mouse_angle;
 	float old_mouse_angle;
diff --git a/src/game/bootloader.cpp b/src/game/bootloader.cpp
index 8228541..1db363f 100644
--- a/src/game/bootloader.cpp
+++ b/src/game/bootloader.cpp
@@ -497,71 +497,87 @@ void setup_rendering(game::context* ctx)
 	// Load fallback material
 	ctx->fallback_material = ctx->resource_manager->load<material>("fallback.mtl");
 	
-	// Setup overworld compositor
-	ctx->overworld_shadow_map_clear_pass = new clear_pass(ctx->rasterizer, ctx->shadow_map_framebuffer);
-	ctx->overworld_shadow_map_clear_pass->set_cleared_buffers(false, true, false);
-	ctx->overworld_shadow_map_clear_pass->set_clear_depth(1.0f);
-	ctx->overworld_shadow_map_pass = new shadow_map_pass(ctx->rasterizer, ctx->shadow_map_framebuffer, ctx->resource_manager);
-	ctx->overworld_shadow_map_pass->set_split_scheme_weight(0.75f);
-	ctx->overworld_clear_pass = new clear_pass(ctx->rasterizer, ctx->framebuffer_hdr);
-	ctx->overworld_clear_pass->set_cleared_buffers(true, true, true);
-	ctx->overworld_clear_pass->set_clear_depth(0.0f);
-	ctx->overworld_sky_pass = new sky_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
-	ctx->app->get_event_dispatcher()->subscribe<mouse_moved_event>(ctx->overworld_sky_pass);
-	ctx->overworld_sky_pass->set_enabled(true);
-	ctx->overworld_material_pass = new material_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
-	ctx->overworld_material_pass->set_fallback_material(ctx->fallback_material);
-	ctx->overworld_material_pass->shadow_map_pass = ctx->overworld_shadow_map_pass;
-	ctx->overworld_material_pass->shadow_map = ctx->shadow_map_depth_texture;
-	ctx->app->get_event_dispatcher()->subscribe<mouse_moved_event>(ctx->overworld_material_pass);
-	ctx->overworld_outline_pass = new outline_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
-	ctx->overworld_outline_pass->set_outline_width(0.25f);
-	ctx->overworld_outline_pass->set_outline_color(float4{1.0f, 1.0f, 1.0f, 1.0f});
-	ctx->overworld_outline_pass->set_enabled(false);
-	ctx->overworld_bloom_pass = new bloom_pass(ctx->rasterizer, ctx->framebuffer_bloom, ctx->resource_manager);
-	ctx->overworld_bloom_pass->set_source_texture(ctx->framebuffer_hdr_color);
-	ctx->overworld_bloom_pass->set_brightness_threshold(1.0f);
-	ctx->overworld_bloom_pass->set_blur_iterations(5);
-	ctx->overworld_bloom_pass->set_enabled(true);
-	ctx->overworld_final_pass = new ::final_pass(ctx->rasterizer, &ctx->rasterizer->get_default_framebuffer(), ctx->resource_manager);
-	ctx->overworld_final_pass->set_color_texture(ctx->framebuffer_hdr_color);
-	ctx->overworld_final_pass->set_bloom_texture(ctx->bloom_texture);
-	ctx->overworld_final_pass->set_blue_noise_texture(blue_noise_map);
-	ctx->overworld_compositor = new compositor();
-	ctx->overworld_compositor->add_pass(ctx->overworld_shadow_map_clear_pass);
-	ctx->overworld_compositor->add_pass(ctx->overworld_shadow_map_pass);
-	ctx->overworld_compositor->add_pass(ctx->overworld_clear_pass);
-	ctx->overworld_compositor->add_pass(ctx->overworld_sky_pass);
-	ctx->overworld_compositor->add_pass(ctx->overworld_material_pass);
-	//ctx->overworld_compositor->add_pass(ctx->overworld_outline_pass);
-	ctx->overworld_compositor->add_pass(ctx->overworld_bloom_pass);
-	ctx->overworld_compositor->add_pass(ctx->overworld_final_pass);
-	
-	// Setup underworld compositor
-	ctx->underworld_clear_pass = new clear_pass(ctx->rasterizer, ctx->framebuffer_hdr);
-	ctx->underworld_clear_pass->set_cleared_buffers(true, true, false);
-	ctx->underworld_material_pass = new material_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
-	ctx->underworld_material_pass->set_fallback_material(ctx->fallback_material);
-	ctx->app->get_event_dispatcher()->subscribe<mouse_moved_event>(ctx->underworld_material_pass);
-	gl::shader_program* underworld_final_shader = ctx->resource_manager->load<gl::shader_program>("underground-final.glsl");
-	ctx->underworld_final_pass = new simple_render_pass(ctx->rasterizer, &ctx->rasterizer->get_default_framebuffer(), underworld_final_shader);
-	ctx->underground_color_texture_property = ctx->underworld_final_pass->get_material()->add_property<const gl::texture_2d*>("color_texture");
-	ctx->underground_color_texture_property->set_value(ctx->framebuffer_hdr_color);
-	ctx->underworld_final_pass->get_material()->update_tweens();
-	ctx->underworld_compositor = new compositor();
-	ctx->underworld_compositor->add_pass(ctx->underworld_clear_pass);
-	ctx->underworld_compositor->add_pass(ctx->underworld_material_pass);
-	ctx->underworld_compositor->add_pass(ctx->underworld_final_pass);
-	
-	// Setup UI camera compositor
-	ctx->ui_clear_pass = new clear_pass(ctx->rasterizer, &ctx->rasterizer->get_default_framebuffer());
-	ctx->ui_clear_pass->set_cleared_buffers(false, true, false);
-	ctx->ui_clear_pass->set_clear_depth(0.0f);
-	ctx->ui_material_pass = new material_pass(ctx->rasterizer, &ctx->rasterizer->get_default_framebuffer(), ctx->resource_manager);
-	ctx->ui_material_pass->set_fallback_material(ctx->fallback_material);
-	ctx->ui_compositor = new compositor();
-	ctx->ui_compositor->add_pass(ctx->ui_clear_pass);
-	ctx->ui_compositor->add_pass(ctx->ui_material_pass);
+	// Setup common render passes
+	{
+		ctx->common_bloom_pass = new bloom_pass(ctx->rasterizer, ctx->framebuffer_bloom, ctx->resource_manager);
+		ctx->common_bloom_pass->set_source_texture(ctx->framebuffer_hdr_color);
+		ctx->common_bloom_pass->set_brightness_threshold(1.0f);
+		ctx->common_bloom_pass->set_blur_iterations(5);
+		
+		ctx->common_final_pass = new ::final_pass(ctx->rasterizer, &ctx->rasterizer->get_default_framebuffer(), ctx->resource_manager);
+		ctx->common_final_pass->set_color_texture(ctx->framebuffer_hdr_color);
+		ctx->common_final_pass->set_bloom_texture(ctx->bloom_texture);
+		ctx->common_final_pass->set_blue_noise_texture(blue_noise_map);
+	}
+	
+	// Setup UI compositor
+	{
+		ctx->ui_clear_pass = new clear_pass(ctx->rasterizer, &ctx->rasterizer->get_default_framebuffer());
+		ctx->ui_clear_pass->set_cleared_buffers(false, true, false);
+		ctx->ui_clear_pass->set_clear_depth(0.0f);
+		
+		ctx->ui_material_pass = new material_pass(ctx->rasterizer, &ctx->rasterizer->get_default_framebuffer(), ctx->resource_manager);
+		ctx->ui_material_pass->set_fallback_material(ctx->fallback_material);
+		
+		ctx->ui_compositor = new compositor();
+		ctx->ui_compositor->add_pass(ctx->ui_clear_pass);
+		ctx->ui_compositor->add_pass(ctx->ui_material_pass);
+	}
+	
+	// Setup underground compositor
+	{
+		ctx->underground_clear_pass = new clear_pass(ctx->rasterizer, ctx->framebuffer_hdr);
+		ctx->underground_clear_pass->set_cleared_buffers(true, true, false);
+		ctx->underground_clear_pass->set_clear_color({1, 0, 1, 0});
+		ctx->underground_clear_pass->set_clear_depth(0.0f);
+		
+		ctx->underground_material_pass = new material_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
+		ctx->underground_material_pass->set_fallback_material(ctx->fallback_material);
+		ctx->app->get_event_dispatcher()->subscribe<mouse_moved_event>(ctx->underground_material_pass);
+		
+		ctx->underground_compositor = new compositor();
+		ctx->underground_compositor->add_pass(ctx->underground_clear_pass);
+		ctx->underground_compositor->add_pass(ctx->underground_material_pass);
+		ctx->underground_compositor->add_pass(ctx->common_bloom_pass);
+		ctx->underground_compositor->add_pass(ctx->common_final_pass);
+	}
+	
+	// Setup surface compositor
+	{
+		ctx->surface_shadow_map_clear_pass = new clear_pass(ctx->rasterizer, ctx->shadow_map_framebuffer);
+		ctx->surface_shadow_map_clear_pass->set_cleared_buffers(false, true, false);
+		ctx->surface_shadow_map_clear_pass->set_clear_depth(1.0f);
+		
+		ctx->surface_shadow_map_pass = new shadow_map_pass(ctx->rasterizer, ctx->shadow_map_framebuffer, ctx->resource_manager);
+		ctx->surface_shadow_map_pass->set_split_scheme_weight(0.75f);
+		
+		ctx->surface_clear_pass = new clear_pass(ctx->rasterizer, ctx->framebuffer_hdr);
+		ctx->surface_clear_pass->set_cleared_buffers(true, true, true);
+		ctx->surface_clear_pass->set_clear_depth(0.0f);
+		
+		ctx->surface_sky_pass = new sky_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
+		ctx->app->get_event_dispatcher()->subscribe<mouse_moved_event>(ctx->surface_sky_pass);
+		
+		ctx->surface_material_pass = new material_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
+		ctx->surface_material_pass->set_fallback_material(ctx->fallback_material);
+		ctx->surface_material_pass->shadow_map_pass = ctx->surface_shadow_map_pass;
+		ctx->surface_material_pass->shadow_map = ctx->shadow_map_depth_texture;
+		ctx->app->get_event_dispatcher()->subscribe<mouse_moved_event>(ctx->surface_material_pass);
+		
+		ctx->surface_outline_pass = new outline_pass(ctx->rasterizer, ctx->framebuffer_hdr, ctx->resource_manager);
+		ctx->surface_outline_pass->set_outline_width(0.25f);
+		ctx->surface_outline_pass->set_outline_color(float4{1.0f, 1.0f, 1.0f, 1.0f});
+		
+		ctx->surface_compositor = new compositor();
+		ctx->surface_compositor->add_pass(ctx->surface_shadow_map_clear_pass);
+		ctx->surface_compositor->add_pass(ctx->surface_shadow_map_pass);
+		ctx->surface_compositor->add_pass(ctx->surface_clear_pass);
+		ctx->surface_compositor->add_pass(ctx->surface_sky_pass);
+		ctx->surface_compositor->add_pass(ctx->surface_material_pass);
+		//ctx->surface_compositor->add_pass(ctx->surface_outline_pass);
+		ctx->surface_compositor->add_pass(ctx->common_bloom_pass);
+		ctx->surface_compositor->add_pass(ctx->common_final_pass);
+	}
 	
 	// Create billboard VAO
 	{
@@ -611,114 +627,100 @@ void setup_scenes(game::context* ctx)
 	
 	// Get default framebuffer
 	const auto& viewport_dimensions = ctx->rasterizer->get_default_framebuffer().get_dimensions();
-	float viewport_aspect_ratio = static_cast<float>(viewport_dimensions[0]) / static_cast<float>(viewport_dimensions[1]);
+	const float viewport_aspect_ratio = static_cast<float>(viewport_dimensions[0]) / static_cast<float>(viewport_dimensions[1]);
 	
 	// Create infinite culling mask
-	float inf = std::numeric_limits<float>::infinity();
+	const float inf = std::numeric_limits<float>::infinity();
 	ctx->no_cull = {{-inf, -inf, -inf}, {inf, inf, inf}};
 	
-	// Setup overworld camera
-	ctx->overworld_camera = new scene::camera();
-	ctx->overworld_camera->set_perspective(math::radians<float>(45.0f), viewport_aspect_ratio, 0.1f, 1000.0f);
-	ctx->overworld_camera->set_compositor(ctx->overworld_compositor);
-	ctx->overworld_camera->set_composite_index(0);
-	ctx->overworld_camera->set_active(true);
-	
-	// Setup underworld camera
-	ctx->underworld_camera = new scene::camera();
-	ctx->underworld_camera->set_perspective(math::radians<float>(45.0f), viewport_aspect_ratio, 0.1f, 1000.0f);
-	ctx->underworld_camera->look_at({0, 50, 0}, {0, 0, 0}, {0, 0, -1});
-	ctx->underworld_camera->set_compositor(ctx->underworld_compositor);
-	ctx->underworld_camera->set_composite_index(0);
-	ctx->underworld_camera->set_active(false);
-	
 	// Setup UI camera
 	ctx->ui_camera = new scene::camera();
 	ctx->ui_camera->set_compositor(ctx->ui_compositor);
 	
-	// Setup lights
-	ctx->moon_light = new scene::directional_light();
-	ctx->moon_light->set_intensity(0.0f);
-	ctx->moon_light->update_tweens();
-	
-	ctx->subterrain_light = new scene::point_light();
-	ctx->subterrain_light->set_color({1, 1, 1});
-	ctx->subterrain_light->set_intensity(1.0f);
-	ctx->subterrain_light->set_attenuation({1.0f, 0.09f, 0.032f});
-	ctx->subterrain_light->update_tweens();
-	
-	ctx->underworld_ambient_light = new scene::ambient_light();
-	ctx->underworld_ambient_light->set_color({1, 1, 1});
-	ctx->underworld_ambient_light->set_intensity(0.1f);
-	ctx->underworld_ambient_light->update_tweens();
-	
-	ctx->lens_spot_light = new scene::spot_light();
-	ctx->lens_spot_light->set_color({1, 1, 1});
-	ctx->lens_spot_light->set_intensity(20.0f);
-	ctx->lens_spot_light->set_attenuation({1.0f, 0.0f, 0.0f});
-	ctx->lens_spot_light->set_cutoff({math::radians(1.25f), math::radians(1.8f)});
-	
-	ctx->flashlight_spot_light = new scene::spot_light();
-	ctx->flashlight_spot_light->set_color({1, 1, 1});
-	ctx->flashlight_spot_light->set_intensity(1.0f);
-	ctx->flashlight_spot_light->set_attenuation({1.0f, 0.0f, 0.0f});
-	ctx->flashlight_spot_light->set_cutoff({math::radians(10.0f), math::radians(19.0f)});
-
-
+	// Setup underground camera
+	ctx->underground_camera = new scene::camera();
+	ctx->underground_camera->set_perspective(math::radians<float>(45.0f), viewport_aspect_ratio, 0.1f, 1000.0f);
+	ctx->underground_camera->set_compositor(ctx->underground_compositor);
+	ctx->underground_camera->set_composite_index(0);
+	ctx->underground_camera->set_active(false);
 	
-	const gl::texture_2d* splash_texture = ctx->resource_manager->load<gl::texture_2d>("splash.tex");
-	auto splash_dimensions = splash_texture->get_dimensions();
-	ctx->splash_billboard_material = new material();
-	ctx->splash_billboard_material->set_shader_program(ctx->resource_manager->load<gl::shader_program>("ui-element-textured.glsl"));
-	ctx->splash_billboard_material->add_property<const gl::texture_2d*>("background")->set_value(splash_texture);
-	ctx->splash_billboard_material->add_property<float4>("tint")->set_value(float4{1, 1, 1, 1});
-	ctx->splash_billboard_material->update_tweens();
-	ctx->splash_billboard = new scene::billboard();
-	ctx->splash_billboard->set_material(ctx->splash_billboard_material);
-	ctx->splash_billboard->set_scale({(float)std::get<0>(splash_dimensions) * 0.5f, (float)std::get<1>(splash_dimensions) * 0.5f, 1.0f});
-	ctx->splash_billboard->set_translation({0.0f, 0.0f, 0.0f});
-	ctx->splash_billboard->update_tweens();
-	
-	
-	// Create depth debug billboard
-	/*
-	material* depth_debug_material = new material();
-	depth_debug_material->set_shader_program(ctx->resource_manager->load<gl::shader_program>("ui-element-textured.glsl"));
-	depth_debug_material->add_property<const gl::texture_2d*>("background")->set_value(shadow_map_depth_texture);
-	depth_debug_material->add_property<float4>("tint")->set_value(float4{1, 1, 1, 1});
-	billboard* depth_debug_billboard = new billboard();
-	depth_debug_billboard->set_material(depth_debug_material);
-	depth_debug_billboard->set_scale({128, 128, 1});
-	depth_debug_billboard->set_translation({-960 + 128, 1080 * 0.5f - 128, 0});
-	depth_debug_billboard->update_tweens();
-	ui_system->get_scene()->add_object(depth_debug_billboard);
-	*/
-	
-	// Setup overworld scene
-	ctx->overworld_scene = new scene::collection();
-	ctx->overworld_scene->add_object(ctx->overworld_camera);
-	//ctx->overworld_scene->add_object(ctx->moon_light);
-	//ctx->overworld_scene->add_object(ctx->spot_light);
-	
-	// Setup underworld scene
-	ctx->underworld_scene = new scene::collection();
-	ctx->underworld_scene->add_object(ctx->underworld_camera);
-	ctx->underworld_scene->add_object(ctx->underworld_ambient_light);
-	//ctx->underworld_scene->add_object(ctx->lantern);
-	//ctx->underworld_scene->add_object(ctx->subterrain_light);
-	//ctx->underworld_scene->add_object(ctx->portal_billboard);
-	//model_instance* larva = new scene::model_instance(ctx->resource_manager->load<model>("larva.mdl"));
-	//ctx->underworld_scene->add_object(larva);
+	// Setup surface camera
+	ctx->surface_camera = new scene::camera();
+	ctx->surface_camera->set_perspective(math::radians<float>(45.0f), viewport_aspect_ratio, 0.1f, 1000.0f);
+	ctx->surface_camera->set_compositor(ctx->surface_compositor);
+	ctx->surface_camera->set_composite_index(0);
+	ctx->surface_camera->set_active(false);
 	
 	// Setup UI scene
-	ctx->ui_scene = new scene::collection();
-	ctx->ui_scene->add_object(ctx->ui_camera);
+	{
+		ctx->ui_scene = new scene::collection();
+		
+		const gl::texture_2d* splash_texture = ctx->resource_manager->load<gl::texture_2d>("splash.tex");
+		auto splash_dimensions = splash_texture->get_dimensions();
+		ctx->splash_billboard_material = new material();
+		ctx->splash_billboard_material->set_shader_program(ctx->resource_manager->load<gl::shader_program>("ui-element-textured.glsl"));
+		ctx->splash_billboard_material->add_property<const gl::texture_2d*>("background")->set_value(splash_texture);
+		ctx->splash_billboard_material->add_property<float4>("tint")->set_value(float4{1, 1, 1, 1});
+		ctx->splash_billboard_material->update_tweens();
+		ctx->splash_billboard = new scene::billboard();
+		ctx->splash_billboard->set_material(ctx->splash_billboard_material);
+		ctx->splash_billboard->set_scale({(float)std::get<0>(splash_dimensions) * 0.5f, (float)std::get<1>(splash_dimensions) * 0.5f, 1.0f});
+		ctx->splash_billboard->set_translation({0.0f, 0.0f, 0.0f});
+		ctx->splash_billboard->update_tweens();
+		
+		// Create depth debug billboard
+		/*
+		material* depth_debug_material = new material();
+		depth_debug_material->set_shader_program(ctx->resource_manager->load<gl::shader_program>("ui-element-textured.glsl"));
+		depth_debug_material->add_property<const gl::texture_2d*>("background")->set_value(shadow_map_depth_texture);
+		depth_debug_material->add_property<float4>("tint")->set_value(float4{1, 1, 1, 1});
+		billboard* depth_debug_billboard = new billboard();
+		depth_debug_billboard->set_material(depth_debug_material);
+		depth_debug_billboard->set_scale({128, 128, 1});
+		depth_debug_billboard->set_translation({-960 + 128, 1080 * 0.5f - 128, 0});
+		depth_debug_billboard->update_tweens();
+		ui_system->get_scene()->add_object(depth_debug_billboard);
+		*/
+		
+		ctx->ui_scene->add_object(ctx->ui_camera);
+	}
 	
-	//ctx->overworld_scene->add_object(ctx->lens_spot_light);
-	ctx->underworld_scene->add_object(ctx->flashlight_spot_light);
+	// Setup underground scene
+	{
+		ctx->underground_scene = new scene::collection();
+		
+		ctx->underground_ambient_light = new scene::ambient_light();
+		ctx->underground_ambient_light->set_color({1, 1, 1});
+		ctx->underground_ambient_light->set_intensity(0.1f);
+		ctx->underground_ambient_light->update_tweens();
+		
+		ctx->flashlight_spot_light = new scene::spot_light();
+		ctx->flashlight_spot_light->set_color({1, 1, 1});
+		ctx->flashlight_spot_light->set_intensity(1.0f);
+		ctx->flashlight_spot_light->set_attenuation({1.0f, 0.0f, 0.0f});
+		ctx->flashlight_spot_light->set_cutoff({math::radians(10.0f), math::radians(19.0f)});
+		
+		ctx->underground_scene->add_object(ctx->underground_camera);
+		ctx->underground_scene->add_object(ctx->underground_ambient_light);
+		//ctx->underground_scene->add_object(ctx->flashlight_spot_light);
+	}
+	
+	// Setup surface scene
+	{
+		ctx->surface_scene = new scene::collection();
+		
+		ctx->lens_spot_light = new scene::spot_light();
+		ctx->lens_spot_light->set_color({1, 1, 1});
+		ctx->lens_spot_light->set_intensity(20.0f);
+		ctx->lens_spot_light->set_attenuation({1.0f, 0.0f, 0.0f});
+		ctx->lens_spot_light->set_cutoff({math::radians(1.25f), math::radians(1.8f)});
+		
+		ctx->surface_scene->add_object(ctx->surface_camera);
+		//ctx->surface_scene->add_object(ctx->lens_spot_light);
+	}
 	
-	// Set overworld as active scene
-	ctx->active_scene = ctx->overworld_scene;
+	// Clear active scene
+	ctx->active_scene = nullptr;
 	
 	logger->pop_task(EXIT_SUCCESS);
 }
@@ -761,14 +763,12 @@ void setup_animation(game::context* ctx)
 	ctx->focal_point_tween->set_interpolator(math::lerp<float3, float>);
 	
 	// Set material pass tweens
-	ctx->overworld_sky_pass->set_time_tween(ctx->time_tween);
-	ctx->overworld_material_pass->set_time_tween(ctx->time_tween);
-	ctx->overworld_material_pass->set_focal_point_tween(ctx->focal_point_tween);
-	ctx->overworld_final_pass->set_time_tween(ctx->time_tween);
-	ctx->underworld_material_pass->set_time_tween(ctx->time_tween);
-	ctx->underworld_material_pass->set_focal_point_tween(ctx->focal_point_tween);
-	ctx->underworld_final_pass->set_time_tween(ctx->time_tween);
-	ctx->underworld_material_pass->set_focal_point_tween(ctx->focal_point_tween);
+	ctx->common_final_pass->set_time_tween(ctx->time_tween);
+	ctx->surface_sky_pass->set_time_tween(ctx->time_tween);
+	ctx->surface_material_pass->set_time_tween(ctx->time_tween);
+	ctx->surface_material_pass->set_focal_point_tween(ctx->focal_point_tween);
+	ctx->underground_material_pass->set_time_tween(ctx->time_tween);
+	ctx->underground_material_pass->set_focal_point_tween(ctx->focal_point_tween);
 	ctx->ui_material_pass->set_time_tween(ctx->time_tween);
 }
 
@@ -801,7 +801,7 @@ void setup_systems(game::context* ctx)
 	// Setup terrain system
 	ctx->terrain_system = new entity::system::terrain(*ctx->entity_registry);
 	ctx->terrain_system->set_patch_subdivisions(30);
-	ctx->terrain_system->set_patch_scene_collection(ctx->overworld_scene);
+	ctx->terrain_system->set_patch_scene_collection(ctx->surface_scene);
 	ctx->terrain_system->set_max_error(200.0);
 	
 	// Setup vegetation system
@@ -810,7 +810,7 @@ void setup_systems(game::context* ctx)
 	//ctx->vegetation_system->set_vegetation_patch_resolution(VEGETATION_PATCH_RESOLUTION);
 	//ctx->vegetation_system->set_vegetation_density(1.0f);
 	//ctx->vegetation_system->set_vegetation_model(ctx->resource_manager->load<model>("grass-tuft.mdl"));
-	//ctx->vegetation_system->set_scene(ctx->overworld_scene);
+	//ctx->vegetation_system->set_scene(ctx->surface_scene);
 	
 	// Setup camera system
 	ctx->camera_system = new entity::system::camera(*ctx->entity_registry);
@@ -820,13 +820,13 @@ void setup_systems(game::context* ctx)
 	
 	// Setup tool system
 	ctx->tool_system = new entity::system::tool(*ctx->entity_registry, event_dispatcher);
-	ctx->tool_system->set_camera(ctx->overworld_camera);
+	ctx->tool_system->set_camera(ctx->surface_camera);
 	ctx->tool_system->set_orbit_cam(ctx->camera_system->get_orbit_cam());
 	ctx->tool_system->set_viewport(viewport);
 	
 	// Setup subterrain system
 	ctx->subterrain_system = new entity::system::subterrain(*ctx->entity_registry, ctx->resource_manager);
-	ctx->subterrain_system->set_scene(ctx->underworld_scene);
+	ctx->subterrain_system->set_scene(ctx->underground_scene);
 	
 	// Setup nest system
 	ctx->nest_system = new entity::system::nest(*ctx->entity_registry, ctx->resource_manager);
@@ -864,11 +864,11 @@ void setup_systems(game::context* ctx)
 	
 	// Setup tracking system
 	ctx->tracking_system = new entity::system::tracking(*ctx->entity_registry, event_dispatcher, ctx->resource_manager);
-	ctx->tracking_system->set_scene(ctx->overworld_scene);
+	ctx->tracking_system->set_scene(ctx->surface_scene);
 	
 	// Setup painting system
 	ctx->painting_system = new entity::system::painting(*ctx->entity_registry, event_dispatcher, ctx->resource_manager);
-	ctx->painting_system->set_scene(ctx->overworld_scene);
+	ctx->painting_system->set_scene(ctx->surface_scene);
 	
 	// Setup solar system
 	ctx->orbit_system = new entity::system::orbit(*ctx->entity_registry);
@@ -883,7 +883,7 @@ void setup_systems(game::context* ctx)
 	
 	// Setup astronomy system
 	ctx->astronomy_system = new entity::system::astronomy(*ctx->entity_registry);
-	ctx->astronomy_system->set_sky_pass(ctx->overworld_sky_pass);
+	ctx->astronomy_system->set_sky_pass(ctx->surface_sky_pass);
 	
 	// Setup proteome system
 	ctx->proteome_system = new entity::system::proteome(*ctx->entity_registry);
@@ -900,15 +900,15 @@ void setup_systems(game::context* ctx)
 	
 	// Setup render system
 	ctx->render_system = new entity::system::render(*ctx->entity_registry);
-	ctx->render_system->add_layer(ctx->overworld_scene);
-	ctx->render_system->add_layer(ctx->underworld_scene);
+	ctx->render_system->add_layer(ctx->underground_scene);
+	ctx->render_system->add_layer(ctx->surface_scene);
 	ctx->render_system->add_layer(ctx->ui_scene);
 	ctx->render_system->set_renderer(ctx->renderer);
 	
 	// Setup control system
 	ctx->control_system = new entity::system::control(*ctx->entity_registry);
 	ctx->control_system->set_viewport(viewport);
-	ctx->control_system->set_underworld_camera(ctx->underworld_camera);
+	ctx->control_system->set_underground_camera(ctx->underground_camera);
 	ctx->control_system->set_tool(nullptr);
 	//ctx->control_system->set_flashlight(flashlight, flashlight_light_cone);
 	ctx->control_system->get_adjust_camera_control()->set_activated_callback([ctx](){ ctx->app->set_relative_mouse_mode(true); ctx->tool_system->set_pick(false); });
@@ -1020,15 +1020,15 @@ void setup_controls(game::context* ctx)
 	ctx->control_system->get_toggle_view_control()->set_activated_callback(
 		[ctx]()
 		{
-			if (ctx->active_scene == ctx->overworld_scene)
+			if (ctx->active_scene == ctx->surface_scene)
 			{
-				ctx->active_scene = ctx->underworld_scene;
+				ctx->active_scene = ctx->underground_scene;
 				ctx->radial_transition_inner->transition(0.5f, false, ease<float, double>::in_quad);
 				
 				auto switch_cameras = [ctx]()
 				{
-					ctx->overworld_camera->set_active(false);
-					ctx->underworld_camera->set_active(true);
+					ctx->surface_camera->set_active(false);
+					ctx->underground_camera->set_active(true);
 					ctx->fade_transition->transition(0.25f, true, ease<float, double>::out_quad);
 				};
 				
@@ -1037,13 +1037,13 @@ void setup_controls(game::context* ctx)
 			}
 			else
 			{
-				ctx->active_scene = ctx->overworld_scene;
+				ctx->active_scene = ctx->surface_scene;
 				ctx->fade_transition->transition(0.25f, false, ease<float, double>::out_quad);
 				
 				auto switch_cameras = [ctx]()
 				{
-					ctx->overworld_camera->set_active(true);
-					ctx->underworld_camera->set_active(false);
+					ctx->surface_camera->set_active(true);
+					ctx->underground_camera->set_active(false);
 					ctx->radial_transition_inner->transition(0.5f, true, ease<float, double>::out_quad);
 				};
 				
@@ -1254,12 +1254,11 @@ void setup_callbacks(game::context* ctx)
 		{
 			// Update tweens
 			ctx->time_tween->update();
-			ctx->overworld_sky_pass->update_tweens();
-			ctx->overworld_scene->update_tweens();
-			ctx->underworld_scene->update_tweens();
+			ctx->surface_sky_pass->update_tweens();
+			ctx->surface_scene->update_tweens();
+			ctx->underground_scene->update_tweens();
 			ctx->ui_scene->update_tweens();
 			ctx->focal_point_tween->update();
-			ctx->underworld_final_pass->get_material()->update_tweens();
 			
 			// Set time tween time
 			(*ctx->time_tween)[1] = t;
diff --git a/src/game/context.hpp b/src/game/context.hpp
index d492ad8..0df5727 100644
--- a/src/game/context.hpp
+++ b/src/game/context.hpp
@@ -164,39 +164,44 @@ struct context
 	gl::texture_2d** marker_albedo_textures;
 	
 	// Compositing
-	bloom_pass* overworld_bloom_pass;
-	clear_pass* overworld_clear_pass;
-	clear_pass* overworld_shadow_map_clear_pass;
 	clear_pass* ui_clear_pass;
-	clear_pass* underworld_clear_pass;
-	final_pass* overworld_final_pass;
-	material_pass* overworld_material_pass;
 	material_pass* ui_material_pass;
-	material_pass* underworld_material_pass;
-	outline_pass* overworld_outline_pass;
-	shadow_map_pass* overworld_shadow_map_pass;
-	simple_render_pass* underworld_final_pass;
-	sky_pass* overworld_sky_pass;
-	material_property<const gl::texture_2d*>* underground_color_texture_property;
-	compositor* overworld_compositor;
-	compositor* underworld_compositor;
 	compositor* ui_compositor;
 	
-	// Scene
+	bloom_pass* common_bloom_pass;
+	final_pass* common_final_pass;
+	
+	clear_pass* underground_clear_pass;
+	material_pass* underground_material_pass;
+	compositor* underground_compositor;
+	
+	clear_pass* surface_shadow_map_clear_pass;
+	shadow_map_pass* surface_shadow_map_pass;
+	clear_pass* surface_clear_pass;
+	sky_pass* surface_sky_pass;
+	material_pass* surface_material_pass;
+	outline_pass* surface_outline_pass;
+	compositor* surface_compositor;
+	
+	// Scene utilities
 	scene::collection* active_scene;
-	scene::collection* overworld_scene;
-	scene::collection* underworld_scene;
+	geom::aabb<float> no_cull;
+	
+	// UI scene
 	scene::collection* ui_scene;
-	scene::camera* overworld_camera;
-	scene::camera* underworld_camera;
 	scene::camera* ui_camera;
-	scene::directional_light* moon_light;
-	scene::point_light* subterrain_light;
-	scene::ambient_light* underworld_ambient_light;
 	scene::billboard* splash_billboard;
+	
+	// Surface scene
+	scene::collection* surface_scene;
+	scene::camera* surface_camera;
 	scene::spot_light* lens_spot_light;
+	
+	// Underground scene
+	scene::collection* underground_scene;
+	scene::camera* underground_camera;
+	scene::ambient_light* underground_ambient_light;
 	scene::spot_light* flashlight_spot_light;
-	geom::aabb<float> no_cull;
 	
 	// Animation
 	timeline* timeline;
diff --git a/src/game/states/brood.cpp b/src/game/states/brood.cpp
new file mode 100644
index 0000000..bdca63e
--- /dev/null
+++ b/src/game/states/brood.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2021  Christopher J. Howard
+ *
+ * This file is part of Antkeeper source code.
+ *
+ * Antkeeper source code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Antkeeper source code is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "game/states/brood.hpp"
+#include "entity/archetype.hpp"
+#include "entity/commands.hpp"
+#include "entity/components/observer.hpp"
+#include "entity/components/camera-follow.hpp"
+#include "entity/components/terrain.hpp"
+#include "entity/components/transform.hpp"
+#include "entity/systems/control.hpp"
+#include "entity/systems/camera.hpp"
+#include "entity/systems/tool.hpp"
+#include "animation/screen-transition.hpp"
+#include "animation/ease.hpp"
+#include "resources/resource-manager.hpp"
+#include "renderer/passes/sky-pass.hpp"
+
+namespace game {
+namespace state {
+namespace brood {
+
+void enter(game::context* ctx)
+{
+	// Switch to underground camera
+	ctx->surface_camera->set_active(false);
+	ctx->underground_camera->set_active(true);
+	
+	ctx->underground_ambient_light->set_intensity(1.0f);
+	
+	// Create camera focal point
+	{
+		entity::component::transform focal_point_transform;
+		focal_point_transform.local = math::identity_transform<float>;
+		focal_point_transform.warp = true;
+		ctx->entity_registry->assign_or_replace<entity::component::transform>(ctx->focal_point_entity, focal_point_transform);
+		
+		entity::component::camera_follow focal_point_follow;
+		ctx->entity_registry->assign_or_replace<entity::component::camera_follow>(ctx->focal_point_entity, focal_point_follow);
+	}
+	
+	// Setup camera
+	ctx->underground_camera->look_at({0, 0, 1}, {0, 0, 0}, {0, 1, 0});
+	ctx->underground_camera->set_exposure(0.0f);
+	
+	ctx->camera_system->set_camera(ctx->underground_camera);
+	ctx->tool_system->set_camera(ctx->underground_camera);
+	ctx->tool_system->set_orbit_cam(ctx->camera_system->get_orbit_cam());
+	
+	entity::system::control* control_system = ctx->control_system;
+	control_system->update(0.0, 0.0);
+	control_system->set_nest(nullptr);
+	
+	// Create larva
+	{
+		entity::archetype* larva_archetype = ctx->resource_manager->load<entity::archetype>("ant-larva.ent");
+		auto larva_eid = larva_archetype->create(*ctx->entity_registry);
+		entity::command::warp_to(*ctx->entity_registry, larva_eid, {0.0f, 0.0f, 0.0f});
+		entity::command::assign_render_layers(*ctx->entity_registry, larva_eid, 0b1);
+	}
+	
+	// Create cocoon
+	{
+		entity::archetype* cocoon_archetype = ctx->resource_manager->load<entity::archetype>("ant-cocoon.ent");
+		auto cocoon_eid = cocoon_archetype->create(*ctx->entity_registry);
+		entity::command::warp_to(*ctx->entity_registry, cocoon_eid, {-50, 0.1935f, 0});
+		entity::command::assign_render_layers(*ctx->entity_registry, cocoon_eid, 0b1);
+	}
+	
+	ctx->underground_scene->update_tweens();
+	
+	// Start fade in
+	ctx->fade_transition->transition(1.0f, true, ease<float>::in_quad);
+}
+
+void exit(game::context* ctx)
+{}
+
+} // namespace brood
+} // namespace state
+} // namespace game
diff --git a/src/game/states/play.hpp b/src/game/states/brood.hpp
similarity index 83%
rename from src/game/states/play.hpp
rename to src/game/states/brood.hpp
index 0ab8ac2..1658aae 100644
--- a/src/game/states/play.hpp
+++ b/src/game/states/brood.hpp
@@ -17,23 +17,23 @@
  * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ANTKEEPER_GAME_STATE_PLAY_HPP
-#define ANTKEEPER_GAME_STATE_PLAY_HPP
+#ifndef ANTKEEPER_GAME_STATE_BROOD_HPP
+#define ANTKEEPER_GAME_STATE_BROOD_HPP
 
 #include "game/context.hpp"
 
 namespace game {
 namespace state {
 
-/// Play game state functions.
-namespace play {
+/// Brood game state functions.
+namespace brood {
 
 void enter(game::context* ctx);
 void exit(game::context* ctx);
 
-} // namespace play
+} // namespace brood
 
 } // namespace state
 } // namespace game
 
-#endif // ANTKEEPER_GAME_STATE_PLAY_HPP
+#endif // ANTKEEPER_GAME_STATE_BROOD_HPP
diff --git a/src/game/states/play.cpp b/src/game/states/forage.cpp
similarity index 72%
rename from src/game/states/play.cpp
rename to src/game/states/forage.cpp
index 840d364..472cf2f 100644
--- a/src/game/states/play.cpp
+++ b/src/game/states/forage.cpp
@@ -17,11 +17,12 @@
  * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "game/states/play.hpp"
+#include "game/states/forage.hpp"
 #include "entity/archetype.hpp"
 #include "entity/commands.hpp"
 #include "entity/components/observer.hpp"
 #include "entity/components/camera-follow.hpp"
+#include "entity/components/terrain.hpp"
 #include "entity/components/transform.hpp"
 #include "entity/systems/astronomy.hpp"
 #include "entity/systems/control.hpp"
@@ -32,10 +33,14 @@
 
 namespace game {
 namespace state {
-namespace play {
+namespace forage {
 
 void enter(game::context* ctx)
 {
+	// Switch to surface camera
+	ctx->underground_camera->set_active(false);
+	ctx->surface_camera->set_active(true);
+	
 	// Find planet EID by name
 	entity::id planet_eid = entt::null;
 	if (auto it = ctx->named_entities.find("planet"); it != ctx->named_entities.end())
@@ -43,6 +48,18 @@ void enter(game::context* ctx)
 		planet_eid = it->second;
 	}
 	
+	// Create biome terrain component
+	entity::component::terrain biome_terrain;
+	biome_terrain.max_lod = 18;
+	biome_terrain.patch_material = ctx->resource_manager->load<material>("desert-terrain.mtl");
+	biome_terrain.elevation = [](double, double) -> double
+	{
+		return 0.0;
+	};
+	
+	// Replace planet terrain component with biome terrain component
+	ctx->entity_registry->replace<entity::component::terrain>(planet_eid, biome_terrain);
+	
 	// Create observer
 	auto observer_eid = ctx->entity_registry->create();
 	{
@@ -51,7 +68,7 @@ void enter(game::context* ctx)
 		observer.elevation = 0.0;
 		observer.latitude = 0.0;
 		observer.longitude = 0.0;
-		observer.camera = ctx->overworld_camera;
+		observer.camera = ctx->surface_camera;
 		ctx->entity_registry->assign<entity::component::observer>(observer_eid, observer);
 		
 		// Set reference location of astronomy system
@@ -71,9 +88,9 @@ void enter(game::context* ctx)
 	}
 	
 	// Setup camera
-	ctx->overworld_camera->look_at({0, 0, 1}, {0, 0, 0}, {0, 1, 0});
-	ctx->overworld_camera->set_exposure(-14.5f);
-	ctx->camera_system->set_camera(ctx->overworld_camera);
+	ctx->surface_camera->look_at({0, 0, 1}, {0, 0, 0}, {0, 1, 0});
+	ctx->surface_camera->set_exposure(-14.5f);
+	ctx->camera_system->set_camera(ctx->surface_camera);
 	
 	entity::system::control* control_system = ctx->control_system;
 	control_system->update(0.0, 0.0);
@@ -86,7 +103,14 @@ void enter(game::context* ctx)
 		entity::command::warp_to(*ctx->entity_registry, larva_eid, {50, 0.1935f, 0});
 	}
 	
-	ctx->overworld_scene->update_tweens();
+	// Create cocoon
+	{
+		entity::archetype* cocoon_archetype = ctx->resource_manager->load<entity::archetype>("ant-cocoon.ent");
+		auto cocoon_eid = cocoon_archetype->create(*ctx->entity_registry);
+		entity::command::warp_to(*ctx->entity_registry, cocoon_eid, {-50, 0.1935f, 0});
+	}
+	
+	ctx->surface_scene->update_tweens();
 	
 	// Start fade in
 	ctx->fade_transition->transition(1.0f, true, ease<float>::in_quad);
@@ -95,6 +119,6 @@ void enter(game::context* ctx)
 void exit(game::context* ctx)
 {}
 
-} // namespace play
+} // namespace forage
 } // namespace state
 } // namespace game
diff --git a/src/game/states/forage.hpp b/src/game/states/forage.hpp
new file mode 100644
index 0000000..b6068e5
--- /dev/null
+++ b/src/game/states/forage.hpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2021  Christopher J. Howard
+ *
+ * This file is part of Antkeeper source code.
+ *
+ * Antkeeper source code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Antkeeper source code is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ANTKEEPER_GAME_STATE_FORAGE_HPP
+#define ANTKEEPER_GAME_STATE_FORAGE_HPP
+
+#include "game/context.hpp"
+
+namespace game {
+namespace state {
+
+/// Forage game state functions.
+namespace forage {
+
+void enter(game::context* ctx);
+void exit(game::context* ctx);
+
+} // namespace forage
+
+} // namespace state
+} // namespace game
+
+#endif // ANTKEEPER_GAME_STATE_FORAGE_HPP
diff --git a/src/game/states/loading.cpp b/src/game/states/loading.cpp
index 3f1ce96..3da4048 100644
--- a/src/game/states/loading.cpp
+++ b/src/game/states/loading.cpp
@@ -30,7 +30,6 @@
 #include "entity/systems/astronomy.hpp"
 #include "entity/systems/orbit.hpp"
 #include "game/states/nuptial-flight.hpp"
-#include "game/states/play.hpp"
 #include "game/states/splash.hpp"
 #include "geom/spherical.hpp"
 #include "gl/drawing-mode.hpp"
@@ -66,6 +65,9 @@ static void selenogenesis(game::context* ctx);
 /// Creates fixed stars.
 static void extrasolar_heliogenesis(game::context* ctx);
 
+/// Creates an ant colony
+static void colonigenesis(game::context* ctx);
+
 void enter(game::context* ctx)
 {
 	// Create universe
@@ -161,6 +163,19 @@ void cosmogenesis(game::context* ctx)
 		throw;
 	}
 	ctx->logger->pop_task(EXIT_SUCCESS);
+	
+	// Create ant colony
+	ctx->logger->push_task("Creating ant colony");
+	try
+	{
+		colonigenesis(ctx);
+	}
+	catch (...)
+	{
+		ctx->logger->pop_task(EXIT_FAILURE);
+		throw;
+	}
+	ctx->logger->pop_task(EXIT_SUCCESS);
 }
 
 void heliogenesis(game::context* ctx)
@@ -209,12 +224,12 @@ void heliogenesis(game::context* ctx)
 	sun_ambient->set_intensity(0.0f);
 	sun_ambient->update_tweens();
 	
-	// Add sun light scene objects to overworld scene
-	ctx->overworld_scene->add_object(sun_direct);
-	ctx->overworld_scene->add_object(sun_ambient);
+	// Add sun light scene objects to surface scene
+	ctx->surface_scene->add_object(sun_direct);
+	ctx->surface_scene->add_object(sun_ambient);
 	
 	// Pass direct sun light scene object to shadow map pass and astronomy system
-	ctx->overworld_shadow_map_pass->set_light(sun_direct);
+	ctx->surface_shadow_map_pass->set_light(sun_direct);
 	ctx->astronomy_system->set_sun_light(sun_direct);
 }
 
@@ -252,8 +267,8 @@ void planetogenesis(game::context* ctx)
 		//return math::random<double>(0.0, 1.0);
 		return 0.0;
 	};
-	terrain.max_lod = 18;
-	terrain.patch_material = ctx->resource_manager->load<material>("desert-terrain.mtl");
+	terrain.max_lod = 0;
+	terrain.patch_material = nullptr;
 	ctx->entity_registry->assign<entity::component::terrain>(planet_eid, terrain);
 	
 	// Assign planetary atmosphere component
@@ -277,7 +292,7 @@ void planetogenesis(game::context* ctx)
 	ctx->astronomy_system->set_reference_body(planet_eid);
 	
 	// Load sky model
-	ctx->overworld_sky_pass->set_sky_model(ctx->resource_manager->load<model>("sky-dome.mdl"));
+	ctx->surface_sky_pass->set_sky_model(ctx->resource_manager->load<model>("sky-dome.mdl"));
 }
 
 void selenogenesis(game::context* ctx)
@@ -289,7 +304,7 @@ void selenogenesis(game::context* ctx)
 	ctx->named_entities["moon"] = moon_eid;
 	
 	// Pass moon model to sky pass
-	ctx->overworld_sky_pass->set_moon_model(ctx->resource_manager->load<model>("moon.mdl"));
+	ctx->surface_sky_pass->set_moon_model(ctx->resource_manager->load<model>("moon.mdl"));
 }
 
 void extrasolar_heliogenesis(game::context* ctx)
@@ -398,7 +413,23 @@ void extrasolar_heliogenesis(game::context* ctx)
 	stars_model_group->set_index_count(star_count);
 	
 	// Pass stars model to sky pass
-	ctx->overworld_sky_pass->set_stars_model(stars_model);
+	ctx->surface_sky_pass->set_stars_model(stars_model);
+}
+
+void colonigenesis(game::context* ctx)
+{
+	// Create queen entity
+	auto queen_eid = ctx->entity_registry->create();
+	ctx->named_entities["queen"] = queen_eid;
+	
+	// Create central shaft entity
+	auto shaft_eid = ctx->entity_registry->create();
+	ctx->named_entities["shaft"] = queen_eid;
+	
+	// Create entrance "lobby" chamber entity
+	auto lobby_eid = ctx->entity_registry->create();
+	ctx->named_entities["lobby"] = lobby_eid;
+	
 }
 
 } // namespace loading
diff --git a/src/game/states/nuptial-flight.cpp b/src/game/states/nuptial-flight.cpp
index f18f524..33b4ea5 100644
--- a/src/game/states/nuptial-flight.cpp
+++ b/src/game/states/nuptial-flight.cpp
@@ -18,6 +18,7 @@
  */
 
 #include "game/states/nuptial-flight.hpp"
+#include "entity/archetype.hpp"
 #include "entity/systems/astronomy.hpp"
 #include "entity/systems/orbit.hpp"
 #include "entity/systems/control.hpp"
@@ -38,6 +39,10 @@ namespace nuptial_flight {
 
 void enter(game::context* ctx)
 {
+	// Switch to surface camera
+	ctx->underground_camera->set_active(false);
+	ctx->surface_camera->set_active(true);
+	
 	// Find planet EID by name
 	entity::id planet_eid = entt::null;
 	if (auto it = ctx->named_entities.find("planet"); it != ctx->named_entities.end())
@@ -45,10 +50,12 @@ void enter(game::context* ctx)
 		planet_eid = it->second;
 	}
 	
-	// Replace planet terrain material with cloud material
-	entity::component::terrain planet_terrain = ctx->entity_registry->get<entity::component::terrain>(planet_eid);
-	planet_terrain.patch_material = ctx->resource_manager->load<material>("cloud.mtl");
-	ctx->entity_registry->replace<entity::component::terrain>(planet_eid, planet_terrain);
+	// Remove terrain component from planet (if any)
+	if (ctx->entity_registry->has<entity::component::terrain>(planet_eid))
+		ctx->entity_registry->remove<entity::component::terrain>(planet_eid);
+	
+	// Enable clouds in sky pass
+	ctx->surface_sky_pass->set_clouds_model(ctx->resource_manager->load<model>("cloud-plane.mdl"));
 	
 	// Create observer
 	auto observer_eid = ctx->entity_registry->create();
@@ -58,7 +65,7 @@ void enter(game::context* ctx)
 		observer.elevation = 2000.0;
 		observer.latitude = 0.0;
 		observer.longitude = 0.0;
-		observer.camera = ctx->overworld_camera;
+		observer.camera = ctx->surface_camera;
 		ctx->entity_registry->assign<entity::component::observer>(observer_eid, observer);
 		
 		// Set reference location of astronomy system
@@ -66,6 +73,21 @@ void enter(game::context* ctx)
 		ctx->astronomy_system->set_observer_location(double3{observer.elevation, observer.latitude, observer.longitude});
 	}
 	
+	// Create wing
+	entity::archetype* ant_forewing_archetype = ctx->resource_manager->load<entity::archetype>("ant-forewing.ent");
+	auto forewing_eid = ctx->entity_registry->create();
+	//ant_forewing_archetype->assign(*ctx->entity_registry, forewing_eid);
+	
+	// Create eye
+	entity::archetype* ant_round_eye_archetype = ctx->resource_manager->load<entity::archetype>("ant-round-eye.ent");
+	auto ant_round_eye_eid = ctx->entity_registry->create();
+	ant_round_eye_archetype->assign(*ctx->entity_registry, ant_round_eye_eid);
+	
+	// Create green orb ring
+	entity::archetype* orb_ring_archetype = ctx->resource_manager->load<entity::archetype>("orb-ring.ent");
+	auto orb_ring_eid = ctx->entity_registry->create();
+	//orb_ring_archetype->assign(*ctx->entity_registry, orb_ring_eid);
+	
 	// Create camera focal point
 	{
 		entity::component::transform focal_point_transform;
@@ -78,14 +100,14 @@ void enter(game::context* ctx)
 	}
 	
 	// Setup camera
-	ctx->overworld_camera->look_at({0, 0, 1}, {0, 0, 0}, {0, 1, 0});
-	ctx->overworld_camera->set_exposure(-14.5f);
-	ctx->camera_system->set_camera(ctx->overworld_camera);
+	ctx->surface_camera->look_at({0, 0, 1}, {0, 0, 0}, {0, 1, 0});
+	ctx->surface_camera->set_exposure(-14.5f);
+	ctx->camera_system->set_camera(ctx->surface_camera);
 	
 	entity::system::control* control_system = ctx->control_system;
 	control_system->update(0.0, 0.0);
 	
-	ctx->overworld_scene->update_tweens();
+	ctx->surface_scene->update_tweens();
 	
 	// Pause motion of celestial objects
 	ctx->astronomy_system->set_time_scale(0.0);
diff --git a/src/game/states/splash.cpp b/src/game/states/splash.cpp
index 48907a6..54369a7 100644
--- a/src/game/states/splash.cpp
+++ b/src/game/states/splash.cpp
@@ -18,7 +18,7 @@
  */
 
 #include "game/states/splash.hpp"
-#include "game/states/play.hpp"
+#include "game/states/brood.hpp"
 #include "animation/screen-transition.hpp"
 #include "animation/ease.hpp"
 #include "animation/timeline.hpp"
@@ -51,9 +51,9 @@ void enter(game::context* ctx)
 	auto change_state = [ctx]()
 	{
 		application::state next_state;
-		next_state.name = "play";
-		next_state.enter = std::bind(game::state::play::enter, ctx);
-		next_state.exit = std::bind(game::state::play::exit, ctx);
+		next_state.name = "brood";
+		next_state.enter = std::bind(game::state::brood::enter, ctx);
+		next_state.exit = std::bind(game::state::brood::exit, ctx);
 		
 		ctx->app->change_state(next_state);
 	};
@@ -83,9 +83,9 @@ void enter(game::context* ctx)
 				ctx->app->swap_buffers();
 				
 				application::state next_state;
-				next_state.name = "play";
-				next_state.enter = std::bind(game::state::play::enter, ctx);
-				next_state.exit = std::bind(game::state::play::exit, ctx);
+				next_state.name = "brood";
+				next_state.enter = std::bind(game::state::brood::enter, ctx);
+				next_state.exit = std::bind(game::state::brood::exit, ctx);
 				
 				ctx->app->change_state(next_state);
 			}
diff --git a/src/renderer/passes/sky-pass.cpp b/src/renderer/passes/sky-pass.cpp
index b3b771f..d52baa7 100644
--- a/src/renderer/passes/sky-pass.cpp
+++ b/src/renderer/passes/sky-pass.cpp
@@ -64,10 +64,15 @@ sky_pass::sky_pass(gl::rasterizer* rasterizer, const gl::framebuffer* framebuffe
 	stars_model_vao(nullptr),
 	star_material(nullptr),
 	star_shader_program(nullptr),
+	clouds_model(nullptr),
+	clouds_model_vao(nullptr),
+	cloud_material(nullptr),
+	cloud_shader_program(nullptr),
 	time_tween(nullptr),
 	observer_altitude_tween(0.0f, math::lerp<float, float>),
 	sun_position_tween(float3{1.0f, 0.0f, 0.0f}, math::lerp<float3, float>),
-	sun_color_tween(float3{1.0f, 1.0f, 1.0f}, math::lerp<float3, float>),
+	sun_color_outer_tween(float3{1.0f, 1.0f, 1.0f}, math::lerp<float3, float>),
+	sun_color_inner_tween(float3{1.0f, 1.0f, 1.0f}, math::lerp<float3, float>),
 	topocentric_frame_translation({0, 0, 0}, math::lerp<float3, float>),
 	topocentric_frame_rotation(math::quaternion<float>::identity(), math::nlerp<float>)
 {}
@@ -88,7 +93,7 @@ void sky_pass::render(render_context* context) const
 	auto viewport = framebuffer->get_dimensions();
 	rasterizer->set_viewport(0, 0, std::get<0>(viewport), std::get<1>(viewport));
 	
-	float time = (*time_tween)[context->alpha];
+	float time = static_cast<float>((*time_tween)[context->alpha]);
 	float2 resolution = {static_cast<float>(std::get<0>(viewport)), static_cast<float>(std::get<1>(viewport))};
 	
 	const scene::camera& camera = *context->camera;
@@ -118,9 +123,11 @@ void sky_pass::render(render_context* context) const
 	float3 sun_direction = math::normalize(sun_position);
 	
 	// Interpolate sun color
-	float3 sun_color = sun_color_tween.interpolate(context->alpha);
+	float3 sun_color_outer = sun_color_outer_tween.interpolate(context->alpha);
+	float3 sun_color_inner = sun_color_inner_tween.interpolate(context->alpha);
 	
-	// Draw sky model
+	// Draw atmosphere
+	if (sky_model)
 	{
 		rasterizer->use_program(*sky_shader_program);
 
@@ -143,7 +150,7 @@ void sky_pass::render(render_context* context) const
 		if (sun_angular_radius_input)
 			sun_angular_radius_input->upload(sun_angular_radius);
 		if (sun_color_input)
-			sun_color_input->upload(sun_color);
+			sun_color_input->upload(sun_color_outer);
 		if (scale_height_rm_input)
 			scale_height_rm_input->upload(scale_height_rm);
 		if (rayleigh_scattering_input)
@@ -160,6 +167,27 @@ void sky_pass::render(render_context* context) const
 		rasterizer->draw_arrays(*sky_model_vao, sky_model_drawing_mode, sky_model_start_index, sky_model_index_count);
 	}
 	
+	// Draw clouds
+	if (clouds_model)
+	{
+		rasterizer->use_program(*cloud_shader_program);
+		
+		if (cloud_model_view_projection_input)
+			cloud_model_view_projection_input->upload(model_view_projection);
+		if (cloud_sun_direction_input)
+			cloud_sun_direction_input->upload(sun_direction);
+		if (cloud_sun_color_input)
+			cloud_sun_color_input->upload(sun_color_inner);
+		if (cloud_camera_position_input)
+			cloud_camera_position_input->upload(context->camera_transform.translation);
+		if (cloud_camera_exposure_input)
+			cloud_camera_exposure_input->upload(exposure);
+		
+		cloud_material->upload(context->alpha);
+
+		rasterizer->draw_arrays(*clouds_model_vao, clouds_model_drawing_mode, clouds_model_start_index, clouds_model_index_count);
+	}
+	
 	glEnable(GL_BLEND);
 	//glBlendFunc(GL_SRC_ALPHA, GL_ONE);
 	glBlendFunc(GL_ONE, GL_ONE);
@@ -345,11 +373,49 @@ void sky_pass::set_stars_model(const model* model)
 	}
 }
 
+void sky_pass::set_clouds_model(const model* model)
+{
+	clouds_model = model;
+	
+	if (clouds_model)
+	{
+		clouds_model_vao = model->get_vertex_array();
+
+		const std::vector<model_group*>& groups = *model->get_groups();
+		for (model_group* group: groups)
+		{
+			cloud_material = group->get_material();
+			clouds_model_drawing_mode = group->get_drawing_mode();
+			clouds_model_start_index = group->get_start_index();
+			clouds_model_index_count = group->get_index_count();
+		}
+		
+		if (cloud_material)
+		{
+			cloud_shader_program = cloud_material->get_shader_program();
+			
+			if (cloud_shader_program)
+			{
+				cloud_model_view_projection_input = cloud_shader_program->get_input("model_view_projection");
+				cloud_sun_direction_input = cloud_shader_program->get_input("sun_direction");
+				cloud_sun_color_input = cloud_shader_program->get_input("sun_color");
+				cloud_camera_position_input = cloud_shader_program->get_input("camera.position");
+				cloud_camera_exposure_input = cloud_shader_program->get_input("camera.exposure");
+			}
+		}
+	}
+	else
+	{
+		clouds_model = nullptr;
+	}
+}
+
 void sky_pass::update_tweens()
 {
 	observer_altitude_tween.update();
 	sun_position_tween.update();
-	sun_color_tween.update();
+	sun_color_outer_tween.update();
+	sun_color_inner_tween.update();
 	topocentric_frame_translation.update();
 	topocentric_frame_rotation.update();
 }
@@ -370,9 +436,10 @@ void sky_pass::set_sun_position(const float3& position)
 	sun_position_tween[1] = position;
 }
 
-void sky_pass::set_sun_color(const float3& color)
+void sky_pass::set_sun_color(const float3& color_outer, const float3& color_inner)
 {
-	sun_color_tween[1] = color;
+	sun_color_outer_tween[1] = color_outer;
+	sun_color_inner_tween[1] = color_inner;
 }
 
 void sky_pass::set_sun_angular_radius(float radius)
diff --git a/src/renderer/passes/sky-pass.hpp b/src/renderer/passes/sky-pass.hpp
index 34b80f9..8fad240 100644
--- a/src/renderer/passes/sky-pass.hpp
+++ b/src/renderer/passes/sky-pass.hpp
@@ -56,11 +56,12 @@ public:
 	void set_time_tween(const tween<double>* time);
 	void set_moon_model(const model* model);
 	void set_stars_model(const model* model);
+	void set_clouds_model(const model* model);
 	
 	void set_topocentric_frame(const physics::frame<float>& frame);
 	
 	void set_sun_position(const float3& position);
-	void set_sun_color(const float3& color);
+	void set_sun_color(const float3& color_outer, const float3& color_inner);
 	void set_sun_angular_radius(float radius);
 	void set_observer_altitude(float altitude);
 	void set_scale_heights(float rayleigh, float mie);
@@ -118,6 +119,20 @@ private:
 	const gl::shader_input* star_projection_input;
 	const gl::shader_input* star_exposure_input;
 	const gl::shader_input* star_distance_input;
+	
+	const model* clouds_model;
+	const material* cloud_material;
+	const gl::vertex_array* clouds_model_vao;
+	gl::drawing_mode clouds_model_drawing_mode;
+	std::size_t clouds_model_start_index;
+	std::size_t clouds_model_index_count;
+	
+	gl::shader_program* cloud_shader_program;
+	const gl::shader_input* cloud_model_view_projection_input;
+	const gl::shader_input* cloud_sun_direction_input;
+	const gl::shader_input* cloud_sun_color_input;
+	const gl::shader_input* cloud_camera_position_input;
+	const gl::shader_input* cloud_camera_exposure_input;
 
 	const gl::texture_2d* blue_noise_map;
 	const gl::texture_2d* sky_gradient;
@@ -127,7 +142,8 @@ private:
 	const tween<double>* time_tween;
 	tween<float> observer_altitude_tween;
 	tween<float3> sun_position_tween;
-	tween<float3> sun_color_tween;
+	tween<float3> sun_color_outer_tween;
+	tween<float3> sun_color_inner_tween;
 	tween<float3> topocentric_frame_translation;
 	tween<math::quaternion<float>> topocentric_frame_rotation;