This is my first post and first of all, Thank you for this wonderfull physics software.
Right now, I'm developing an Indie race game. I chose Bullet for the physics and I integrated the vehicle example in the engine code but the vehicle doesn't turn correctly. The problem could be seen in this video: http://www.youtube.com/watch?v=Bwz8Sgk0 ... e=youtu.be
The settings of the raycast vehicle are:
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#define PHYSCAR_SCALE 1
#define CUBE_HALF_EXTENTS 1
int rightIndex = 0;
int upIndex = 1;
int forwardIndex = 2;
const int maxProxies = 32766;
const int maxOverlap = 65535;
float gEngineForce = 0.f;
float gBreakingForce = 0.f;
float maxEngineForce = 100000.f;//this should be engine/velocity dependent
float maxBreakingForce = 10000.f;
float gVehicleSteering = 0.f;
float steeringIncrement = 0.04f;
float steeringClamp = 0.3f;
float wheelRadius = 0.35f * PHYSCAR_SCALE;
float wheelWidth = 0.2f * PHYSCAR_SCALE;
float wheelFriction = 10;
float suspensionStiffness = 50.f;
float suspensionDamping = 0.3f * 2.0f * btSqrt(suspensionStiffness);
float suspensionCompression = 0.2f * 2.0f * btSqrt(suspensionStiffness);
float rollInfluence = 1.f;
btVector3 wheelDirectionCS0(0,-1,0);
btVector3 wheelAxleCS(-1,0,0);
btScalar suspensionRestLength = 0.15f * PHYSCAR_SCALE;
And the wheels are created like this:
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float connectionHeight = 1.2f;
bool isFrontWheel=true;
//choose coordinate system
m_vehicle->setCoordinateSystem(rightIndex, upIndex, forwardIndex);
// front left
btVector3 connectionPointCS0(CUBE_HALF_EXTENTS-(0.3*wheelWidth),connectionHeight,2*CUBE_HALF_EXTENTS-wheelRadius);
m_vehicle->addWheel(connectionPointCS0,wheelDirectionCS0,wheelAxleCS,suspensionRestLength,wheelRadius,m_tuning,isFrontWheel);
// front right
connectionPointCS0 = btVector3(-CUBE_HALF_EXTENTS+(0.3*wheelWidth),connectionHeight,2*CUBE_HALF_EXTENTS-wheelRadius);
m_vehicle->addWheel(connectionPointCS0,wheelDirectionCS0,wheelAxleCS,suspensionRestLength,wheelRadius,m_tuning,isFrontWheel);
// rear left
connectionPointCS0 = btVector3(-CUBE_HALF_EXTENTS+(0.3*wheelWidth),connectionHeight,-2*CUBE_HALF_EXTENTS+wheelRadius);
isFrontWheel = false;
m_vehicle->addWheel(connectionPointCS0,wheelDirectionCS0,wheelAxleCS,suspensionRestLength,wheelRadius,m_tuning,isFrontWheel);
// rear right
connectionPointCS0 = btVector3(CUBE_HALF_EXTENTS-(0.3*wheelWidth),connectionHeight,-2*CUBE_HALF_EXTENTS+wheelRadius);
btWheelInfo& wheel_RR = m_vehicle->addWheel(connectionPointCS0,wheelDirectionCS0,wheelAxleCS,suspensionRestLength,wheelRadius,m_tuning,isFrontWheel);
for (int i=0;i<m_vehicle->getNumWheels();i++){
btWheelInfo& wheel = m_vehicle->getWheelInfo(i);
wheel.m_suspensionStiffness = suspensionStiffness;
wheel.m_wheelsDampingRelaxation = suspensionDamping;
wheel.m_wheelsDampingCompression = suspensionCompression;
wheel.m_frictionSlip = wheelFriction;
wheel.m_rollInfluence = rollInfluence;
}
