Reverse speed

The Vehicle class can "run" in reverse speed?

Absolutely. Find this line within OgreOdeVehicle.cpp

for (std::vector<Vehicle::Wheel*>::iterator i = b;i != e;i++)
{
(*i)->update(power,desiredRpm, brake);
}

Change desiredRpm to negative number.

you can call:
Vehicle::setInputs( steering, -1.0, 0.0 );

but the torque curves will be wrong (inverted).

It worked!!!! Thanks a lot again!!!!

Dirso

This code works fine if the car is stopped. By if it's moving forward, it won't stop to get reverse speed.
I did this piece of code, but it doesn't work too:
if (mID->isKeyDown(m_cThrottle))
{
m_bReverseSpeed = false;
}
else if (mID->isKeyDown(m_cBrake) && (_vehicle->getVelocity() <= 0))
{
m_bReverseSpeed = true;
}

if (m_bReverseSpeed)
{
_vehicle->setInputs( 0.0, -1.0, 0.0 );
}
else
{
_vehicle->setInputs( mID->isKeyDown(m_cLeft),mID->isKeyDown(m_cRight),
mID->isKeyDown(m_cThrottle), mID->isKeyDown(m_cBrake));
}

_vehicle->update(lTimeElapsed);

if (_camera)
{
// Thanks to Ahmed!
const Real followFactor = 0.2;
const Real camHeight = 2.0;
const Real camDistance = 7.0;
const Real camLookAhead = 8.0;
Quaternion q = _vehicle->getSceneNode()->getOrientation();
Vector3 toCam = _vehicle->getSceneNode()->getPosition();

toCam.y += camHeight;
toCam.z -= camDistance * q.zAxis().z;
toCam.x -= camDistance * q.zAxis().x;

_camera->move( (toCam - _camera->getPosition()) * followFactor );
_camera->lookAt(_vehicle->getSceneNode()->getPosition() + ((_vehicle->getSceneNode()->getOrientation() * Vector3::UNIT_Z) * camLookAhead));
}
Any ideas about what I'm doing wrong?

Thanks a lot,
Dirso

If you want i can copy-paste the code i have when i get home, but (in my code) reverse only works when you holds the break key and the car is stoped.....

It would be great!

Thanks a lot,
Dirso

here goes:


void GBVehicle::_processInput( const FrameEvent& evt )
{
Real steering, sqrSpeed = mVehicle->getBody()->getLinearVelocity().squaredLength();
if( mInputDevice->isKeyDown(KC_J) )
{
steering = -1.0;
} else if( mInputDevice->isKeyDown(KC_L) )
{
steering = 1.0;
} else
{
steering = 0.0;
}

if( mInputDevice->isKeyDown(KC_K) && ( sqrSpeed <= 0.1 || !mDrivingForward ) )
{
mVehicle->setInputs( steering, -1.0, 0.0 );
mDrivingForward = false;
} else
{
mVehicle->setInputs( mInputDevice->isKeyDown(KC_J),mInputDevice->isKeyDown(KC_L),
mInputDevice->isKeyDown(KC_I),mInputDevice->isKeyDown(KC_K));
mDrivingForward = true;
}
}


good luck

I really don't understand what is happening
You code is almost the same as mine, and the car only run in reverse speed if it is stopped, if i start moving the car stops if i press BRAKE but it doesn't start moving backward. But i don't really understand why if i start moving backward and press THROTTLE it stops and DOES start moving forward.
Do you have any ideas?
Real sqrSpeed = _vehicle->getBody()->getLinearVelocity().squaredLength();
if (mID->isKeyDown(m_cThrottle))
{
m_bReverseSpeed = false;
}
else if (mID->isKeyDown(m_cBrake) && (sqrSpeed < 0.1))
{
m_bReverseSpeed = true;
}

if (m_bReverseSpeed)
{
_vehicle->setInputs( 0.0, -1.0, 0.0 );
}
else
{
_vehicle->setInputs( mID->isKeyDown(m_cLeft),mID->isKeyDown(m_cRight),
mID->isKeyDown(m_cThrottle), mID->isKeyDown(m_cBrake));
}

_vehicle->update(lTimeElapsed);


if i start moving the car stops if i press BRAKE but it doesn't start moving backward. But i don't really understand why if i start moving backward and press THROTTLE it stops and DOES start moving forward.

you are right... i don't know either
we should see what's doing OgreOde internally, and also revert the torque in reverse.....

May be another solution would be to just reverse the torque curve setting the values with negative numbers. This is not a realistic solution but may fix all those problems.

Is that a bug?

Could you help me reversing the torque curve with that code i post?

Thanks for all your help,
Dirso

Could you help me reversing the torque curve with that code i post?


i tried reverting the torque in my code but it didnt work

anyway the current behavior is ok to me, i think the player *must* press again the break key to go on reverse.....

EDIT: try what syedhs said

Absolutely. Find this line within OgreOdeVehicle.cpp

for (std::vector<Vehicle::Wheel*>::iterator i = b;i != e;i++)
{
(*i)->update(power,desiredRpm, brake);
}

Change desiredRpm to negative number.

I didn't use it because I have no idea how. Could anyone help me?

Thanks a lot!

I don't know about your application but for me there is something wrong.
The reverse speed only works if (a) the car is stopped in the beggining or (b) if it stops after collision
If it stops by itself (after losing power) or if I press BREAK again (even after it stopped by itself), it won't move backward.

Thanks a lot,
Dirso

The reverse speed only works if (a) the car is stopped in the beggining or (b) if it stops after collision
If it stops by itself (after losing power) or if I press BREAK again (even after it stopped by itself), it won't move backward.

It doesn't happen with the code i posted and after reading your code i dont see anything wrong there (but i didn't compile it...).
Debug your application, use printfs or just adapt the code i sent to you and see if the problem is still there.

Your code really worked and i don't know what i did wrong
Anyway, I think it is not a good way to do that asking the player to press BREAK again to move backward.
Thinking about the ogre or the ode internal code what is the diference between keeping the BREAK key pressed or pressing/releasing/pressing again the BREAK key?

If anyone could explain me that i'll try to figure out how to make it work.

Thanks a lot,
Dirso.