Can't use Blocks env; fails to build libUE4Editor-AirSim.so

[inic8]

hi,

I am following the steps here: https://github.com/Microsoft/AirSim/blob/master/docs/unreal_blocks.md

I am building it for Linux (ubuntu 16.04, UE 4.17.2)

This step fails: 4. If you get prompted for incompatible version and conversion, select In-place conversion which is usually under "More" options. If you get prompted for missing modules, make sure to select No so you don't exit.

Compilation error is: In file included from ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/CameraDirector.h:4: ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:28:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'is_fpv_vehicle' has an initializer bool is_fpv_vehicle = false; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:29:21: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'vehicle_config_name' has an initializer std::string vehicle_config_name = ""; //use the default config name ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:30:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'enable_collisions' has an initializer bool enable_collisions = true; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:31:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'enable_passthrough_on_collisions' has an initializer bool enable_passthrough_on_collisions = false; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:32:15: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'home_lattitude' has an initializer float home_lattitude = 47.641468; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:33:15: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'home_longitude' has an initializer float home_longitude = -122.140165; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:34:15: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'home_altitude' has an initializer float home_altitude = 122; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:35:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'enable_trace' has an initializer bool enable_trace = false; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:42:105: note: implicit default constructor for 'VehiclePawnWrapper::WrapperConfig' first required here ...std::vector<APIPCamera>& cameras, const WrapperConfig& config = Wrapper... ^ In file included from /home/shashank/Code/Alpha/Projects/reinforcement-learning/AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Intermediate/Build/Linux/B4D820EA/UE4Editor/Development/AirSim/Module.AirSim.cpp:14: In file included from /home/shashank/Code/Alpha/Projects/reinforcement-learning/AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/AirSimGameMode.cpp:4: In file included from ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/SimHUD/SimHUD.h:6: In file included from ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/SimMode/SimModeBase.h:5: In file included from ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/CameraDirector.h:4: ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:28:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'is_fpv_vehicle' has an initializer bool is_fpv_vehicle = false; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:29:21: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'vehicle_config_name' has an initializer std::string vehicle_config_name = ""; //use the default config name ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:30:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'enable_collisions' has an initializer bool enable_collisions = true; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:31:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'enable_passthrough_on_collisions' has an initializer bool enable_passthrough_on_collisions = false; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:32:15: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'home_lattitude' has an initializer float home_lattitude = 47.641468; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:33:15: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'home_longitude' has an initializer float home_longitude = -122.140165; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:34:15: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'home_altitude' has an initializer float home_altitude = 122; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:35:14: error: cannot use defaulted default constructor of 'WrapperConfig' within 'VehiclePawnWrapper' outside of member functions because 'enable_trace' has an initializer bool enable_trace = false; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:42:105: note: implicit default constructor for 'VehiclePawnWrapper::WrapperConfig' first required here ...std::vector<APIPCamera>& cameras, const WrapperConfig& config = Wrapper... ^ In file included from /home/shashank/Code/Alpha/Projects/reinforcement-learning/AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Intermediate/Build/Linux/B4D820EA/UE4Editor/Development/AirSim/Module.AirSim.cpp:37: /home/shashank/Code/Alpha/Projects/reinforcement-learning/AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.cpp:11:21: error: constructor for 'VehiclePawnWrapper' must explicitly initialize the member 'config' which does not have a default constructor VehiclePawnWrapper::VehiclePawnWrapper() ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:104:19: note: member is declared here WrapperConfig config; ^ ../../../AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Source/VehiclePawnWrapper.h:27:12: note: 'VehiclePawnWrapper::WrapperConfig' declared here struct WrapperConfig { ^ 8 errors generated.

UE gui output is: ... Reflection code generated for BlocksEditor in 8.3575719 seconds @progress pop Using bundled libc++ standard C++ library. Using fast way to relink circularly dependent libraries (no FixDeps). Performing 5 actions (20 in parallel) [1/5] Compile Module.AirSim.cpp [3/5] Compile Blocks.cpp [2/5] Compile Module.AirSim.gen.cpp ERROR: UBT ERROR: Failed to produce item: /home/shashank/Code/Alpha/Projects/reinforcement-learning/AirSim/Unreal/Environments/Blocks/Plugins/AirSim/Binaries/Linux/libUE4Editor-AirSim.so Total build time: 108.22 seconds (Local executor: 0.00 seconds)

Thanks!

[spsancti]

Facing the same issue now :(

[Kalay1995]

in file VehiclePawnWrapper.h, change class VehiclePawnWrapper to '''c class VehiclePawnWrapper { public: //types typedef msr::airlib::GeoPoint GeoPoint; typedef msr::airlib::Vector3r Vector3r; typedef msr::airlib::Pose Pose; typedef msr::airlib::Quaternionr Quaternionr; typedef msr::airlib::CollisionInfo CollisionInfo; typedef msr::airlib::VectorMath VectorMath; typedef msr::airlib::real_T real_T; typedef msr::airlib::Utils Utils;

public:
struct WrapperConfig {
    bool is_fpv_vehicle;// = false; 
    std::string vehicle_config_name;// = ""; //use the default config name
    bool enable_collisions;// = true; 
    bool enable_passthrough_on_collisions;// = false; 
    float home_lattitude;// = 47.641468;
    float home_longitude;// = -122.140165;
    float home_altitude;// = 122;
    bool enable_trace;// = false;
};

''' and in file VehiclePawnWrapper.cpp, change VehiclePawnWrapper::VehiclePawnWrapper() to '''c VehiclePawnWrapper::VehiclePawnWrapper() { static ConstructorHelpers::FObjectFinder collision_display(TEXT("ParticleSystem'/AirSim/StarterContent/Particles/P_Explosion.P_Explosion'")); if (!collision_display.Succeeded()) collision_display_template = collision_display.Object; else collision_display_template = nullptr;

config_.is_fpv_vehicle = false; 
config_.vehicle_config_name = ""; //use the default config name
config_.enable_collisions = true; 
config_.enable_passthrough_on_collisions = false; 
config_.home_lattitude = 47.641468;
config_.home_longitude = -122.140165;
config_.home_altitude = 122;
config_.enable_trace = false;

} '''

It works for me. I am not familiar with markdown, sorry :)

[Kalay1995]

But I face another problem: I can spawn car and control it normally. But when I spawn quadrotor, the scene would be white, unfortunately.

[inic8]

@spsancti What @Kalay1995 proposes regarding braces-or-equal initializers for nested classes solves the issue as far as car simulation is concerned. Thanks @Kalay1995.

[sytelus]

@Kalay1995 - your proposed fix is bit problematic. I've added proper fix in master branch.