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Merge branch 'soft-physics-landing' of https://github.com/supertuxkart/stk-code

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This commit is contained in:
Arthur-D 2014-10-01 00:31:02 +02:00
commit 7bbcae3056
2 changed files with 34 additions and 18 deletions
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4
lib/bullet/src/BulletDynamics/Vehicle/btWheelInfo.h
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@ -77,6 +77,8 @@ struct btWheelInfo
bool m_bIsFrontWheel;
bool m_was_on_ground;
void* m_clientInfo;//can be used to store pointer to sync transforms...
btWheelInfo(btWheelInfoConstructionInfo& ci)
@ -102,7 +104,7 @@ struct btWheelInfo
m_rollInfluence = btScalar(0.1);
m_bIsFrontWheel = ci.m_bIsFrontWheel;
m_maxSuspensionForce = ci.m_maxSuspensionForce;
m_was_on_ground = true;
}
void updateWheel(const btRigidBody& chassis,RaycastInfo& raycastInfo);

48
src/physics/btKart.cpp
View File

@ -260,18 +260,15 @@ btScalar btKart::rayCast(unsigned int index)
depth = raylen * rayResults.m_distFraction;
if (object && depth < max_susp_len)
{
param = rayResults.m_distFraction;
wheel.m_raycastInfo.m_contactNormalWS = rayResults.m_hitNormalInWorld;
wheel.m_raycastInfo.m_contactNormalWS.normalize();
wheel.m_raycastInfo.m_isInContact = true;
///@todo for driving on dynamic/movable objects!;
wheel.m_raycastInfo.m_groundObject = &getFixedBody();
btScalar hitDistance = param*raylen;
wheel.m_raycastInfo.m_suspensionLength =
hitDistance - wheel.m_wheelsRadius;
//clamp on max suspension travel
wheel.m_raycastInfo.m_suspensionLength = depth - wheel.m_wheelsRadius;
//clamp on max suspension travel
btScalar minSuspensionLength = wheel.getSuspensionRestLength()
- wheel.m_maxSuspensionTravelCm*btScalar(0.01);
btScalar maxSuspensionLength = wheel.getSuspensionRestLength()
@ -314,17 +311,6 @@ btScalar btKart::rayCast(unsigned int index)
} else
{
if(object)
{
if(depth + m_chassisBody->getLinearVelocity().getY() *1./60.f < max_susp_len)
{
btVector3 v = -0.25f*0.5f*m_chassisBody->getLinearVelocity();
v.setZ(0);
v.setX(0);
m_chassisBody->applyCentralImpulse(v/m_chassisBody->getInvMass());
}
}
depth = btScalar(-1.0);
//put wheel info as in rest position
wheel.m_raycastInfo.m_suspensionLength = wheel.getSuspensionRestLength();
@ -404,6 +390,34 @@ void btKart::updateVehicle( btScalar step )
m_num_wheels_on_ground++;
}
bool needs_cushioning_test = false;
for(int i=0; i<m_wheelInfo.size(); i++)
{
btWheelInfo &wheel = m_wheelInfo[i];
if(!wheel.m_was_on_ground && wheel.m_raycastInfo.m_isInContact)
{
needs_cushioning_test = true;
break;
}
}
if(needs_cushioning_test)
{
const btVector3 &v = m_chassisBody->getLinearVelocity();
btVector3 down(0, 1, 0);
btVector3 v_down = (v * down) * down;
btScalar max_compensate_speed = m_wheelInfo[0].m_maxSuspensionForce * m_chassisBody->getInvMass() * step *4;
if(-v_down.getY() > max_compensate_speed)
{
btVector3 impulse = down * (-v_down.getY() - max_compensate_speed) / m_chassisBody->getInvMass();
float v_old = m_chassisBody->getLinearVelocity().getY();
m_chassisBody->applyCentralImpulse(impulse);
Log::verbose("physics", "Cushioning %f from %f m/s to %f m/s", impulse.getY(),
v_old, m_chassisBody->getLinearVelocity().getY());
}
}
for(int i=0; i<m_wheelInfo.size(); i++)
m_wheelInfo[i].m_was_on_ground = m_wheelInfo[i].m_raycastInfo.m_isInContact;
// If the kart is flying, try to keep it parallel to the ground.
if(m_num_wheels_on_ground==0)
{
@ -413,7 +427,7 @@ void btKart::updateVehicle( btScalar step )
// Give a nicely balanced feeling for rebalancing the kart
m_chassisBody->applyTorqueImpulse(axis * m_kart->getKartProperties()->getSmoothFlyingImpulse());
}
// Work around: make sure that either both wheels on one axis
// are on ground, or none of them. This avoids the problem of
// the kart suddenly getting additional angular velocity because