Готовые рецепты rbfx

//обязательно присвойте yaw первоначальное значение
REApplication::REApplication(Urho3D::Context* context)
    : Application(context),
    yaw_(0.0f),
    pitch_(0.0f)
{
}

void REApplication::Start()
{
    CreateConsoleAndDebugHud();
    
    // Create scene providing a colored background.
    CreateScene();

    // Finally subscribe to the update event. Note that by subscribing events at this point we have already missed some events
    // like the ScreenMode event sent by the Graphics subsystem when opening the application window. To catch those as well we
    // could subscribe in the constructor instead.
    SubscribeToEvents();

    // Pass console commands to file system.
    GetSubsystem<FileSystem>()->SetExecuteConsoleCommands(true);
    GetSubsystem<Console>()->RefreshInterpreters();
}

void REApplication::SubscribeToEvents()
{
    SubscribeToEvent(E_UPDATE, URHO3D_HANDLER(REApplication, OnUpdate));
}

void REApplication::OnUpdate(StringHash, VariantMap& eventData)
{
    float deltaTime = eventData[Update::P_TIMESTEP].GetFloat();

    MoveCamera(deltaTime);
}

void REApplication::MoveCamera(float deltaTime)
{
    if (GetSubsystem<UI>()->GetFocusElement())
        return;

    auto* input = GetSubsystem<Input>();

    // Movement speed as world units per second
    const float MOVE_SPEED = 20.0f;
    // Mouse sensitivity as degrees per pixel
    const float MOUSE_SENSITIVITY = 0.1f;

    // Use this frame's mouse motion to adjust camera node yaw and pitch. Clamp the pitch between -90 and 90 degrees
    IntVector2 mouseMove = input->GetMouseMove();
    yaw_ += MOUSE_SENSITIVITY * mouseMove.x_;
    pitch_ += MOUSE_SENSITIVITY * mouseMove.y_;
    pitch_ = Clamp(pitch_, -90.0f, 90.0f);

    // Construct new orientation for the camera scene node from yaw and pitch. Roll is fixed to zero
    cameraNode_->SetRotation(Quaternion(pitch_, yaw_, 0.0));
    

    // Read WASD keys and move the camera scene node to the corresponding direction if they are pressed
    if (input->GetKeyDown(KEY_W))
        cameraNode_->Translate(Vector3::FORWARD * MOVE_SPEED * deltaTime);
    if (input->GetKeyDown(KEY_S))
        cameraNode_->Translate(Vector3::BACK * MOVE_SPEED * deltaTime);
    if (input->GetKeyDown(KEY_A))
        cameraNode_->Translate(Vector3::LEFT * MOVE_SPEED * deltaTime);
    if (input->GetKeyDown(KEY_D))
        cameraNode_->Translate(Vector3::RIGHT * MOVE_SPEED * deltaTime);

}