urho3d/Source/Samples/18_CharacterDemo/CharacterDemo.cpp

#include "AnimatedModel.h"
#include "AnimationController.h"
#include "Camera.h"
#include "Character.h"
#include "CollisionShape.h"
#include "Controls.h"
#include "CoreEvents.h"
#include "Engine.h"
#include "Font.h"
#include "Input.h"
#include "Light.h"
#include "Material.h"
#include "Model.h"
#include "Octree.h"
#include "PhysicsWorld.h"
#include "ProcessUtils.h"
#include "Renderer.h"
#include "RigidBody.h"
#include "ResourceCache.h"
#include "Scene.h"
#include "StaticModel.h"
#include "Text.h"
#include "UI.h"
#include "Zone.h"

#include "CharacterDemo.h"

#include "DebugNew.h"

const float CAMERA_MIN_DIST = 1.0f;
const float CAMERA_MAX_DIST = 5.0f;

DEFINE_APPLICATION_MAIN(CharacterDemo)

CharacterDemo::CharacterDemo(Context* context) :
    Sample(context),
    firstPerson_(false)
{
    // Register factory for the Character component so it can be created via CreateComponent
    context_->RegisterFactory<Character>();
}

void CharacterDemo::Start()
{
    // Execute base class startup
    Sample::Start();
    
    // Create static scene content
    CreateScene();
    
    // Create the controllable character
    CreateCharacter();
    
    // Create the UI content
    CreateInstructions();
    
    // Subscribe to necessary events
    SubscribeToEvents();
}

void CharacterDemo::CreateScene()
{
    ResourceCache* cache = GetSubsystem<ResourceCache>();
    
    scene_ = new Scene(context_);
    
    // Create scene subsystem components
    scene_->CreateComponent<Octree>();
    scene_->CreateComponent<PhysicsWorld>();
    
    // Create camera and define viewport. Camera does not necessarily have to belong to the scene
    cameraNode_ = new Node(context_);
    Camera* camera = cameraNode_->CreateComponent<Camera>();
    GetSubsystem<Renderer>()->SetViewport(0, new Viewport(context_, scene_, camera));
    
    // Create static scene content. First create a zone for ambient lighting and fog control
    Node* zoneNode = scene_->CreateChild("Zone");
    Zone* zone = zoneNode->CreateComponent<Zone>();
    zone->SetAmbientColor(Color(0.15f, 0.15f, 0.15f));
    zone->SetFogColor(Color(0.5f, 0.5f, 0.7f));
    zone->SetFogStart(100.0f);
    zone->SetFogEnd(300.0f);
    zone->SetBoundingBox(BoundingBox(-1000.0f, 1000.0f));
    
    // Create a directional light with cascaded shadow mapping
    Node* lightNode = scene_->CreateChild("DirectionalLight");
    lightNode->SetDirection(Vector3(0.3f, -0.5f, 0.425f));
    Light* light = lightNode->CreateComponent<Light>();
    light->SetLightType(LIGHT_DIRECTIONAL);
    light->SetCastShadows(true);
    light->SetShadowBias(BiasParameters(0.0001f, 0.5f));
    light->SetShadowCascade(CascadeParameters(10.0f, 50.0f, 200.0f, 0.0f, 0.8f));
    light->SetSpecularIntensity(0.5f);

    // Create the floor object
    Node* floorNode = scene_->CreateChild("Floor");
    floorNode->SetPosition(Vector3(0.0f, -0.5f, 0.0f));
    floorNode->SetScale(Vector3(200.0f, 1.0f, 200.0f));
    StaticModel* object = floorNode->CreateComponent<StaticModel>();
    object->SetModel(cache->GetResource<Model>("Models/Box.mdl"));
    object->SetMaterial(cache->GetResource<Material>("Materials/Stone.xml"));
    
    RigidBody* body = floorNode->CreateComponent<RigidBody>();
    // Use collision layer bit 2 to mark world scenery. This is what we will raycast against to prevent camera from going
    // inside geometry
    body->SetCollisionLayer(2);
    CollisionShape* shape = floorNode->CreateComponent<CollisionShape>();
    shape->SetBox(Vector3::ONE);
    
    // Create mushrooms of varying sizes
    const unsigned NUM_MUSHROOMS = 60;
    for (unsigned i = 0; i < NUM_MUSHROOMS; ++i)
    {
        Node* objectNode = scene_->CreateChild("Mushroom");
        objectNode->SetPosition(Vector3(Random(180.0f) - 90.0f, 0.0f, Random(180.0f) - 90.0f));
        objectNode->SetRotation(Quaternion(0.0f, Random(360.0f), 0.0f));
        objectNode->SetScale(2.0f + Random(5.0f));
        StaticModel* object = objectNode->CreateComponent<StaticModel>();
        object->SetModel(cache->GetResource<Model>("Models/Mushroom.mdl"));
        object->SetMaterial(cache->GetResource<Material>("Materials/Mushroom.xml"));
        object->SetCastShadows(true);
        
        RigidBody* body = objectNode->CreateComponent<RigidBody>();
        body->SetCollisionLayer(2);
        CollisionShape* shape = objectNode->CreateComponent<CollisionShape>();
        shape->SetTriangleMesh(object->GetModel(), 0);
    }
    
    // Create movable boxes. Let them fall from the sky at first
    const unsigned NUM_SMALL_BOXES = 100;
    for (unsigned i = 0; i < NUM_SMALL_BOXES; ++i)
    {
        float scale = Random(2.0f) + 0.5f;
        
        Node* objectNode = scene_->CreateChild("Box");
        objectNode->SetPosition(Vector3(Random(180.0f) - 90.0f, Random(10.0f) + 10.0f, Random(180.0f) - 90.0f));
        objectNode->SetRotation(Quaternion(Random(360.0f), Random(360.0f), Random(360.0f)));
        objectNode->SetScale(scale);
        StaticModel* object = objectNode->CreateComponent<StaticModel>();
        object->SetModel(cache->GetResource<Model>("Models/Box.mdl"));
        object->SetMaterial(cache->GetResource<Material>("Materials/Stone.xml"));
        object->SetCastShadows(true);
        
        RigidBody* body = objectNode->CreateComponent<RigidBody>();
        body->SetCollisionLayer(2);
        // Bigger boxes will be heavier and harder to move
        body->SetMass(scale * 2.0f);
        CollisionShape* shape = objectNode->CreateComponent<CollisionShape>();
        shape->SetBox(Vector3::ONE);
    }
}

void CharacterDemo::CreateCharacter()
{
    ResourceCache* cache = GetSubsystem<ResourceCache>();
    
    Node* objectNode = scene_->CreateChild("Jack");
    objectNode->SetPosition(Vector3(0.0f, 1.0f, 0.0f));
    
    // Create the rendering component + animation controller
    AnimatedModel* object = objectNode->CreateComponent<AnimatedModel>();
    object->SetModel(cache->GetResource<Model>("Models/Jack.mdl"));
    object->SetMaterial(cache->GetResource<Material>("Materials/Jack.xml"));
    object->SetCastShadows(true);
    objectNode->CreateComponent<AnimationController>();
    
    // Create rigidbody, and set non-zero mass so that the body becomes dynamic
    RigidBody* body = objectNode->CreateComponent<RigidBody>();
    body->SetCollisionLayer(1);
    body->SetMass(1.0f);
    
    // Set zero angular factor so that physics doesn't turn the character on its own.
    // Instead we will control the character yaw manually
    body->SetAngularFactor(Vector3::ZERO);
    
    // Set the rigidbody to signal collision also when in rest, so that we get ground collisions properly
    body->SetCollisionEventMode(COLLISION_ALWAYS);
    
    // Set a capsule shape for collision
    CollisionShape* shape = objectNode->CreateComponent<CollisionShape>();
    shape->SetCapsule(0.7f, 1.8f, Vector3(0.0f, 0.9f, 0.0f));
    
    // Create the character logic component, which takes care of steering the rigidbody
    // Remember it so that we can set the controls. Use a WeakPtr because the scene hierarchy already owns it
    // and keeps it alive as long as it's not removed from the hierarchy
    character_ = objectNode->CreateComponent<Character>();
}

void CharacterDemo::CreateInstructions()
{
    ResourceCache* cache = GetSubsystem<ResourceCache>();
    UI* ui = GetSubsystem<UI>();
    
    // Construct new Text object, set string to display and font to use
    Text* instructionText = ui->GetRoot()->CreateChild<Text>();
    instructionText->SetText(
        "Use WASD keys and mouse to move\n"
        "Space to jump, F to toggle 1st/3rd person"
    );
    instructionText->SetFont(cache->GetResource<Font>("Fonts/Anonymous Pro.ttf"), 15);
    // The text has multiple rows. Center them in relation to each other
    instructionText->SetTextAlignment(HA_CENTER);
    
    // Position the text relative to the screen center
    instructionText->SetHorizontalAlignment(HA_CENTER);
    instructionText->SetVerticalAlignment(VA_CENTER);
    instructionText->SetPosition(0, ui->GetRoot()->GetHeight() / 4);
}

void CharacterDemo::SubscribeToEvents()
{
    // Subscribe to Update event for setting the character controls before physics simulation
    SubscribeToEvent(E_UPDATE, HANDLER(CharacterDemo, HandleUpdate));
    
    // Subscribe to PostUpdate event for updating the camera position after physics simulation
    SubscribeToEvent(E_POSTUPDATE, HANDLER(CharacterDemo, HandlePostUpdate));
}

void CharacterDemo::HandleUpdate(StringHash eventType, VariantMap& eventData)
{
    using namespace Update;
    
    float timeStep = eventData[P_TIMESTEP].GetFloat();
    Input* input = GetSubsystem<Input>();

    if (character_)
    {
        UI* ui = GetSubsystem<UI>();
        
        // Get movement controls and assign them to the character logic component. If UI has a focused element, clear controls
        if (!ui->GetFocusElement())
        {
            character_->controls_.Set(CTRL_UP, input->GetKeyDown('W'));
            character_->controls_.Set(CTRL_DOWN, input->GetKeyDown('S'));
            character_->controls_.Set(CTRL_LEFT, input->GetKeyDown('A'));
            character_->controls_.Set(CTRL_RIGHT, input->GetKeyDown('D'));
            character_->controls_.Set(CTRL_JUMP, input->GetKeyDown(KEY_SPACE));
            
            // Add character yaw & pitch from the mouse motion
            character_->controls_.yaw_ += (float)input->GetMouseMoveX() * YAW_SENSITIVITY;
            character_->controls_.pitch_ += (float)input->GetMouseMoveY() * YAW_SENSITIVITY;
            // Limit pitch
            character_->controls_.pitch_ = Clamp(character_->controls_.pitch_, -80.0f, 80.0f);
            
            // Switch between 1st and 3rd person
            if (input->GetKeyPress('F'))
                firstPerson_ = !firstPerson_;
        }
        else
            character_->controls_.Set(CTRL_UP | CTRL_DOWN | CTRL_LEFT | CTRL_RIGHT | CTRL_JUMP, false);
        
        // Set rotation already here so that it's updated every rendering frame instead of every physics frame
        character_->GetNode()->SetRotation(Quaternion(character_->controls_.yaw_, Vector3::UP));
    }
}

void CharacterDemo::HandlePostUpdate(StringHash eventType, VariantMap& eventData)
{
    if (!character_)
        return;
    
    Node* characterNode = character_->GetNode();
    
    // Get camera lookat dir from character yaw + pitch
    Quaternion rot = characterNode->GetRotation();
    Quaternion dir = rot * Quaternion(character_->controls_.pitch_, Vector3::RIGHT);
    
    if (firstPerson_)
    {
        // First person camera: position to the head bone + offset slightly forward & up
        Node* headNode = characterNode->GetChild("Bip01_Head", true);
        if (headNode)
        {
            cameraNode_->SetPosition(headNode->GetWorldPosition() + rot * Vector3(0.0f, 0.15f, 0.2f));
            cameraNode_->SetRotation(dir);
        }
    }
    else
    {
        // Third person camera: position behind the character
        Vector3 aimPoint = characterNode->GetPosition() + rot * Vector3(0.0f, 1.7f, 0.0f);
        
        // Collide camera ray with static physics objects (layer bitmask 2) to ensure we see the character properly
        Vector3 rayDir = dir * Vector3::BACK;
        float rayDistance = CAMERA_MAX_DIST;
        PhysicsRaycastResult result;
        scene_->GetComponent<PhysicsWorld>()->RaycastSingle(result, Ray(aimPoint, rayDir), rayDistance, 2);
        if (result.body_)
            rayDistance = Min(rayDistance, result.distance_);
        rayDistance = Clamp(rayDistance, CAMERA_MIN_DIST, CAMERA_MAX_DIST);
        
        cameraNode_->SetPosition(aimPoint + rayDir * rayDistance);
        cameraNode_->SetRotation(dir);
    }
}