ilikecats/stk-code_catmod
1
1
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Bugfix: avoid tunneling (i.e. kart chassis ends up partly in track before

Browse Source 
being pushed out by bullet again. In this case a rescue might be triggered
since there is no terrain under the kart for a frame).


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2588 178a84e3-b1eb-0310-8ba1-8eac791a3b58
This commit is contained in:
hikerstk 2008-12-09 10:58:01 +00:00
parent 9b622e59c7
commit 2aa37e242f
1 changed files with 24 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
src/karts/kart.cpp
View File

@ -559,7 +559,13 @@ void Kart::update(float dt)
// the wheel suspension will be fully compressed, resulting in the
// ray to start too low (under the track).
Vec3 pos_plus_epsilon = trans.getOrigin()+btVector3(0,0,0.2f);
//btVector3 pos_plus_epsilon (-56.6874237, -137.48851, -3.06826854);
// These values cause the track not to be hit in tuxtrack. I leave
// them in as a test case if additional debugging should be needed.
// Note: it might be that the kart chassis is actually 'in' the track,
// i.e. it's a tunneling problem!
//btVector3 pos_plus_epsilon (-54.449902, -139.99402, -3.4524240);
// motionstate: -52.449902, -139.99402, -3.6524241
// collision object -52.221024, -139.99614, -3.5276926
TerrainInfo::update(pos_plus_epsilon);
const Material* material=getMaterial();
@ -838,6 +844,23 @@ void Kart::updatePhysics (float dt)
getVehicle()->getRigidBody()->setLinearVelocity( velocity );
}
// To avoid tunneling (which can happen on long falls), clamp the
// velocity in Z direction. Tunneling can happen if the Z velocity
// is larger than the maximum suspension travel (per frame), since then
// the wheel suspension can not stop/slow down the fall (though I am
// not sure if this is enough in all cases!). So the speed is limited
// to suspensionTravel / dt with dt = 1/60 (since this is the dt
// bullet is using).
const Vec3 &v = m_body->getLinearVelocity();
if(v.getZ() < - m_kart_properties->getSuspensionTravelCM()*0.01f*60)
{
Vec3 v_clamped = v;
// clamp the speed to 99% of the maxium falling speed.
v_clamped.setZ(-m_kart_properties->getSuspensionTravelCM()*0.01f*60 * 0.99f);
m_body->setLinearVelocity(v_clamped);
}
//at low velocity, forces on kart push it back and forth so we ignore this
if(fabsf(m_speed) < 0.2f) // quick'n'dirty workaround for bug 1776883
m_speed = 0;