void PERFORMANCE_TESTING::TestMaxSpeed(std::ostream & info_output, std::ostream & error_output)
{
info_output << "Testing maximum speed" << std::endl;
ResetCar();
double maxtime = 300.0;
double t = 0.;
double dt = .004;
int i = 0;
std::vector <float> inputs(CARINPUT::INVALID, 0.0);
inputs[CARINPUT::THROTTLE] = 1.0;
std::pair <float, float> maxspeed;
maxspeed.first = 0;
maxspeed.second = 0;
float lastsecondspeed = 0;
float stopthreshold = 0.001; //if the accel (in m/s^2) is less than this value, discontinue the testing
float timeto60start = 0; //don't start the 0-60 clock until the car is moving at a threshold speed to account for the crappy launch that the autoclutch gives
float timeto60startthreshold = 2.23; //threshold speed to start 0-60 clock in m/s
//float timeto60startthreshold = 0.01; //threshold speed to start 0-60 clock in m/s
float timeto60 = maxtime;
float timetoquarter = maxtime;
float quarterspeed = 0;
std::string downforcestr = "N/A";
while (t < maxtime)
{
car.HandleInputs(inputs);
world.update(dt);
if (car.dynamics.GetSpeed() > maxspeed.second)
{
maxspeed.first = t;
maxspeed.second = car.dynamics.GetSpeed();
std::stringstream dfs;
dfs << -car.GetTotalAero()[2] << " N; " << -car.GetTotalAero()[2]/car.GetTotalAero()[0] << ":1 lift/drag";
downforcestr = dfs.str();
}
if (car.dynamics.GetSpeed() < timeto60startthreshold)
timeto60start = t;
if (car.dynamics.GetSpeed() < 26.8224)
timeto60 = t;
if (car.dynamics.GetCenterOfMass().length() > 402.3 && timetoquarter == maxtime)
{
//quarter mile!
timetoquarter = t - timeto60start;
quarterspeed = car.dynamics.GetSpeed();
}
if (i % (int)(1.0/dt) == 0) //every second
{
if (1)
{
if (car.dynamics.GetSpeed() - lastsecondspeed < stopthreshold && car.dynamics.GetSpeed() > 26.0)
{
//info_output << "Maximum speed attained at " << maxspeed.first << " s" << std::endl;
break;
}
if (car.GetEngineRPM() < 1)
{
error_output << "Car stalled during launch, t=" << t << std::endl;
break;
}
}
lastsecondspeed = car.dynamics.GetSpeed();
//std::cout << t << ", " << car.dynamics.GetSpeed() << ", " << car.GetGear() << ", " << car.GetEngineRPM() << std::endl;
}
t += dt;
i++;
}
info_output << "Maximum speed: " << ConvertToMPH(maxspeed.second) << " MPH at " << maxspeed.first << " s" << std::endl;
info_output << "Downforce at maximum speed: " << downforcestr << std::endl;
info_output << "0-60 MPH time: " << timeto60-timeto60start << " s" << std::endl;
info_output << "1/4 mile time: " << timetoquarter << " s" << " at " << ConvertToMPH(quarterspeed) << " MPH" << std::endl;
}
void PerformanceTesting::TestMaxSpeed(std::ostream & info_output, std::ostream & error_output)
{
info_output << "Testing maximum speed" << std::endl;
float maxtime = 300.0;
float t = 0.;
float dt = 1/90.0;
int i = 0;
std::pair <float, float> maxspeed;
maxspeed.first = 0;
maxspeed.second = 0;
float lastsecondspeed = 0;
float stopthreshold = 0.001; //if the accel (in m/s^2) is less than this value, discontinue the testing
float timeto60start = 0; //don't start the 0-60 clock until the car is moving at a threshold speed to account for the crappy launch that the autoclutch gives
float timeto60startthreshold = 2.23; //threshold speed to start 0-60 clock in m/s
//float timeto60startthreshold = 0.01; //threshold speed to start 0-60 clock in m/s
float timeto60 = maxtime;
float timetoquarter = maxtime;
float quarterspeed = 0;
std::string downforcestr = "N/A";
ResetCar();
clock_t cpu_timer_start = clock();
while (t < maxtime)
{
if (car.GetTransmission().GetGear() == 1 &&
car.GetEngine().GetRPM() > 0.8 * car.GetEngine().GetRedline())
{
carinput[CarInput::BRAKE] = 0.0f;
}
car.Update(carinput);
world.update(dt);
float car_speed = car.GetSpeed();
if (car_speed > maxspeed.second)
{
maxspeed.first = t;
maxspeed.second = car.GetSpeed();
std::ostringstream dfs;
dfs << -car.GetTotalAero()[2] << " N; " << -car.GetTotalAero()[2]/car.GetTotalAero()[0] << ":1 lift/drag";
downforcestr = dfs.str();
}
if (car_speed < timeto60startthreshold)
timeto60start = t;
if (car_speed < 26.8224)
timeto60 = t;
if (car.GetCenterOfMass().length() > 402.3 && timetoquarter == maxtime)
{
//quarter mile!
timetoquarter = t - timeto60start;
quarterspeed = car_speed;
}
if (i % (int)(1.0/dt) == 0) //every second
{
if (1)
{
if (car_speed - lastsecondspeed < stopthreshold && car_speed > 26.0)
{
//info_output << "Maximum speed attained at " << maxspeed.first << " s" << std::endl;
break;
}
if (!car.GetEngine().GetCombustion())
{
error_output << "Car stalled during launch, t=" << t << std::endl;
break;
}
}
lastsecondspeed = car_speed;
//std::cout << t << ", " << car_speed << ", " << car.GetGear() << ", " << car.GetEngineRPM() << std::endl;
}
t += dt;
i++;
}
clock_t cpu_timer_stop = clock();
info_output << "Maximum speed: " << ConvertToMPH(maxspeed.second) << " MPH at " << maxspeed.first << " s" << std::endl;
info_output << "Downforce at maximum speed: " << downforcestr << std::endl;
info_output << "0-60 MPH time: " << timeto60 - timeto60start << " s" << std::endl;
info_output << "1/4 mile time: " << timetoquarter << " s" << " at " << ConvertToMPH(quarterspeed) << " MPH" << std::endl;
info_output << "Simulation performance: " << t / float(cpu_timer_stop - cpu_timer_start) * CLOCKS_PER_SEC << std::endl;
}
void PerformanceTesting::TestStoppingDistance(bool abs, std::ostream & info_output, std::ostream & error_output)
{
info_output << "Testing stopping distance" << std::endl;
float maxtime = 300;
float t = 0.;
float dt = 1/90.0;
int i = 0;
float stopthreshold = 0.1; //if the speed (in m/s) is less than this value, discontinue the testing
btVector3 stopstart; //where the stopping starts
float brakestartspeed = 26.82; //speed at which to start braking, in m/s (26.82 m/s is 60 mph)
// wheel lockup speeds during braking
float front_lockup_speed = 0.0f;
float rear_lockup_speed = 0.0f;
bool accelerating = true; //switches to false once 60 mph is reached
ResetCar();
car.SetABS(abs);
while (t < maxtime)
{
if (accelerating && car.GetTransmission().GetGear() == 1 &&
car.GetEngine().GetRPM() > 0.8f * car.GetEngine().GetRedline())
{
carinput[CarInput::BRAKE] = 0;
carinput[CarInput::CLUTCH] = 0;
}
car.Update(carinput);
world.update(dt);
float car_speed = car.GetSpeed();
if (car_speed >= brakestartspeed && accelerating) //stop accelerating and hit the brakes
{
stopstart = car.GetWheelPosition(WheelPosition(0));
carinput[CarInput::THROTTLE] = 0;
carinput[CarInput::BRAKE] = 1;
accelerating = false;
//info_output << "hitting the brakes at " << t << ", " << car_speed << std::endl;
}
if (!accelerating && car_speed < stopthreshold)
{
break;
}
if (!accelerating)
{
if (!(front_lockup_speed > 0) && car.GetWheel(WheelPosition(0)).GetRPM() < 0.001f)
{
front_lockup_speed = car_speed;
}
if (!(rear_lockup_speed > 0) && car.GetWheel(WheelPosition(3)).GetRPM() < 0.001f)
{
rear_lockup_speed = car_speed;
}
}
if (t > 0 && !car.GetEngine().GetCombustion())
{
error_output << "Car stalled during launch, t=" << t << std::endl;
}
if (i % (int)(1/dt) == 0) //every second
{
//info_output << t
// << ", " << car_speed
// << ", " << car.GetWheel(WheelPosition(0)).GetAngularVelocity()
// << ", " << car.GetBrake(WheelPosition(0)).GetBrakeFactor()
// << std::endl;
}
t += dt;
i++;
}
btVector3 stopend = car.GetWheelPosition(WheelPosition(0));
info_output << "60-0 stopping distance ";
if (abs)
info_output << "(ABS)";
else
info_output << "(no ABS)";
info_output << ": " << ConvertToFeet((stopend-stopstart).length()) << " ft\n"
<< "Wheel lockup speed " << ConvertToMPH(front_lockup_speed)
<< ", " << ConvertToMPH(rear_lockup_speed) << std::endl;
}
void PerformanceTesting::Test(
const std::string & cardir,
const std::string & carname,
ContentManager & content,
std::ostream & info_output,
std::ostream & error_output)
{
info_output << "Beginning car performance test on " << carname << std::endl;
// init track
assert(!track);
assert(!plane);
btVector3 planeNormal(0, 0, 1);
btScalar planeConstant = 0;
plane = new btStaticPlaneShape(planeNormal, planeConstant);
plane->setUserPointer(static_cast<void*>(&surface));
track = new btCollisionObject();
track->setCollisionShape(plane);
track->setActivationState(DISABLE_SIMULATION);
track->setUserPointer(static_cast<void*>(&surface));
world.addCollisionObject(track);
//load the car dynamics
std::shared_ptr<PTree> cfg;
content.load(cfg, cardir, carname + ".car");
if (!cfg->size())
{
return;
}
// position is the center of a 2 x 4 x 1 meter box on track surface
btVector3 pos(0.0, -2.0, 0.5);
btQuaternion rot = btQuaternion::getIdentity();
const std::string tire = "";
const bool damage = false;
if (!car.Load(*cfg, cardir, tire, pos, rot, damage, world, content, error_output))
{
return;
}
btVector3 cm = -car.GetCenterOfMassOffset();
info_output << carname << " Summary:\n"
<< "Mass including driver and fuel: " << 1 / car.GetInvMass() << " kg\n"
<< "Center of mass: " << cm[0] << ", " << cm[1] << ", " << cm[2] << " m\n"
<< "Estimated top speed: " << ConvertToMPH(car.GetMaxSpeedMPS()) << " MPH" << std::endl;
std::ostringstream statestream;
joeserialize::BinaryOutputSerializer serialize_output(statestream);
if (!car.Serialize(serialize_output))
{
error_output << "Serialization error" << std::endl;
}
//else info_output << "Car state: " << statestream.str();
carstate = statestream.str();
TestMaxSpeed(info_output, error_output);
TestStoppingDistance(false, info_output, error_output);
TestStoppingDistance(true, info_output, error_output);
info_output << "Car performance test complete." << std::endl;
}
void PerformanceTesting::TestMaxSpeed(std::ostream & info_output, std::ostream & error_output)
{
info_output << "Testing top speed" << std::endl;
float maxtime = 300;
float t = 0.;
float dt = 1/90.0;
int i = 0;
std::pair <float, float> maxspeed(0, 0);
float maxlift = 0;
float maxdrag = 0;
float lastsecondspeed = 0;
float stopthreshold = 0.001; //if the accel (in m/s^2) is less than this value, discontinue the testing
float timeto60start = 0; //don't start the 0-60 clock until the car is moving at a threshold speed to account for the crappy launch that the autoclutch gives
float timeto60startthreshold = 1; //threshold speed to start 0-60 clock in m/s
float timeto60 = maxtime;
float timetoquarter = maxtime;
float quarterspeed = 0;
ResetCar();
clock_t cpu_timer_start = clock();
while (t < maxtime)
{
if (car.GetTransmission().GetGear() == 1 &&
car.GetEngine().GetRPM() > 0.8f * car.GetEngine().GetRedline())
{
carinput[CarInput::BRAKE] = 0;
carinput[CarInput::CLUTCH] = 0;
}
car.Update(carinput);
world.update(dt);
float car_speed = car.GetSpeed();
if (car_speed > maxspeed.second)
{
maxspeed.first = t;
maxspeed.second = car_speed;
maxlift = car.GetTotalAero()[2];
maxdrag = car.GetTotalAero()[1];
}
if (car_speed < timeto60startthreshold)
timeto60start = t;
if (car_speed < 26.8224f)
timeto60 = t;
if (car.GetCenterOfMass().length() > 402.3f && timetoquarter == maxtime)
{
//quarter mile!
timetoquarter = t - timeto60start;
quarterspeed = car_speed;
}
if (i % (int)(1/dt) == 0) //every second
{
if (car_speed - lastsecondspeed < stopthreshold && car_speed > 26)
{
//info_output << "Maximum speed attained at " << maxspeed.first << " s" << std::endl;
break;
}
if (t > 0 && !car.GetEngine().GetCombustion())
{
error_output << "Car stalled during launch, t=" << t << std::endl;
}
lastsecondspeed = car_speed;
//std::cout << t << ", " << car_speed << ", " << car.GetGear() << ", " << car.GetEngineRPM() << std::endl;
}
t += dt;
i++;
}
clock_t cpu_timer_stop = clock();
clock_t clock_ticks = cpu_timer_stop - cpu_timer_start;
float sim_perf = (clock_ticks > 0) ? t / clock_ticks * CLOCKS_PER_SEC : 0;
info_output << "Top speed: " << ConvertToMPH(maxspeed.second) << " MPH at " << maxspeed.first << " s\n";
info_output << "Downforce at top speed: " << -maxlift << " N\n";
info_output << "Drag at top speed: " << -maxdrag << " N\n";
info_output << "0-60 MPH time: " << timeto60 - timeto60start << " s\n";
info_output << "1/4 mile time: " << timetoquarter << " s at " << ConvertToMPH(quarterspeed) << " MPH" << std::endl;
info_output << "Simulation performance: " << sim_perf << std::endl;
}