void PerformanceTesting::TestStoppingDistance(bool abs, std::ostream & info_output, std::ostream & error_output)
{
info_output << "Testing stopping distance" << std::endl;
float maxtime = 300.0;
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)
bool accelerating = true; //switches to false once 60 mph is reached
ResetCar();
car.SetABS(abs);
while (t < maxtime)
{
if (accelerating)
{
carinput[CarInput::THROTTLE] = 1.0f;
carinput[CarInput::BRAKE] = 0.0f;
}
else
{
carinput[CarInput::THROTTLE] = 0.0f;
carinput[CarInput::BRAKE] = 1.0f;
}
car.Update(carinput);
world.update(dt);
float car_speed = car.GetSpeed();
if (car_speed >= brakestartspeed && accelerating) //stop accelerating and hit the brakes
{
accelerating = false;
stopstart = car.GetWheelPosition(WheelPosition(0));
//std::cout << "hitting the brakes at " << t << ", " << car_speed << std::endl;
}
if (!accelerating && car_speed < stopthreshold)
{
break;
}
if (!car.GetEngine().GetCombustion())
{
error_output << "Car stalled during launch, t=" << t << std::endl;
break;
}
if (i % (int)(1.0/dt) == 0) //every second
{
//std::cout << t << ", " << car.dynamics.GetSpeed() << ", " << car.GetGear() << ", " << car.GetEngineRPM() << 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" << std::endl;
}
void PERFORMANCE_TESTING::TestStoppingDistance(bool abs, std::ostream & info_output, std::ostream & error_output)
{
info_output << "Testing stopping distance" << std::endl;
ResetCar();
car.dynamics.SetABS(abs);
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;
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)
bool accelerating = true; //switches to false once 60 mph is reached
while (t < maxtime)
{
if (accelerating)
{
inputs[CARINPUT::THROTTLE] = 1.0;
inputs[CARINPUT::BRAKE] = 0.0;
}
else
{
inputs[CARINPUT::THROTTLE] = 0.0;
inputs[CARINPUT::BRAKE] = 1.0;
inputs[CARINPUT::NEUTRAL] = 1.0;
}
car.HandleInputs(inputs);
world.update(dt);
if (car.dynamics.GetSpeed() >= brakestartspeed && accelerating) //stop accelerating and hit the brakes
{
accelerating = false;
stopstart = car.dynamics.GetWheelPosition(WHEEL_POSITION(0));
//std::cout << "hitting the brakes at " << t << ", " << car.dynamics.GetSpeed() << std::endl;
}
if (!accelerating && car.dynamics.GetSpeed() < stopthreshold)
{
break;
}
if (car.GetEngineRPM() < 1)
{
error_output << "Car stalled during launch, t=" << t << std::endl;
break;
}
if (i % (int)(1.0/dt) == 0) //every second
{
//std::cout << t << ", " << car.dynamics.GetSpeed() << ", " << car.GetGear() << ", " << car.GetEngineRPM() << std::endl;
}
t += dt;
i++;
}
btVector3 stopend = car.dynamics.GetWheelPosition(WHEEL_POSITION(0));
info_output << "60-0 stopping distance ";
if (abs)
info_output << "(ABS)";
else
info_output << "(no ABS)";
info_output << ": " << ConvertToFeet((stopend-stopstart).length()) << " ft" << 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;
}
