bool LaserPhysicsComponent::testIntersectionWithAsteroid(Laser &laser, Asteroid &asteroid)
{
D3DXVECTOR3 currLaserPos = laser.getPosition(), lastLaserPos = laser.getLastPosition(),
laserDir = laser.getDirection(), asteroidPosition = asteroid.getPosition();
float asteroidRadius = getAsteroidBoundingSphereRadius(asteroid);
float asteroidPosToLaserEnd;
//check if the laser ray intersects a rough bounding sphere of the asteroid
if (!D3DXSphereBoundProbe(&asteroidPosition, asteroidRadius, &lastLaserPos, &laserDir)) {
return false;
}
asteroidPosToLaserEnd = D3DXVec3LengthSq(&(currLaserPos - asteroidPosition));
//if this is true then the laser's current position does not fall within the sphere, and a ray starting at the laser's
//current point crosses the circle. A ray starting at the last point already crosses the sphere, so this means both
//points are "before" the sphere, along the ray in the direction the laser is travelling.
if (asteroidRadius * asteroidRadius < asteroidPosToLaserEnd &&
D3DXSphereBoundProbe(&asteroidPosition, asteroidRadius, &currLaserPos, &laserDir)) {
return false;
}
//it may have collided. Now check ray against mesh
shared_ptr<GraphicsComponent> gfx = asteroid.getGraphicsComponent();
AsteroidGraphicsComponent *asteroidGraphicsComponent = dynamic_cast<AsteroidGraphicsComponent*>(gfx.get());
if (asteroidGraphicsComponent == NULL) {
throw "Asteroid didn't have a valid asteroid graphics component!";
}
BOOL hit;
float dist;
D3DXVECTOR3 laserPosRelativeToAsteroid = lastLaserPos - asteroidPosition;
D3DXVECTOR3 asteroidScale = asteroid.getScale();
D3DXQUATERNION rotationQuat = asteroid.getRotationQuat();
D3DXMATRIX rot, scale;
D3DXMatrixScaling(&scale, 0.8f/asteroidScale.x, 0.8f/asteroidScale.y, 0.8f/asteroidScale.z);
D3DXMatrixRotationQuaternion(&rot, &rotationQuat);
D3DXVec3TransformCoord(&laserPosRelativeToAsteroid, &laserPosRelativeToAsteroid, &(scale * rot));
D3DXIntersect(asteroidGraphicsComponent->getMesh(),
&laserPosRelativeToAsteroid,
&laserDir,
&hit,
NULL,
NULL,
NULL,
&dist,
NULL,
NULL);
float distTravelledSq = D3DXVec3LengthSq(&(currLaserPos - lastLaserPos));
if (!hit || dist * dist > D3DXVec3LengthSq(&(currLaserPos - lastLaserPos))) {
return false;
}
return true;
}
void GunTurret::updateLasers(float elapsedtime/*, MapLoader& m_map, Player& p*/)
{
m_lasergentime += elapsedtime;
m_lasersit = m_lasers.begin();
//bool switchhit = false;
while (m_lasersit != m_lasers.end())
{
//cout << "Number of lasers: " << m_lasers.size();
Laser* l = *m_lasersit;
Vector3 pos = l->getPosition();
//Vector3 startpos = l->getStartPosition();
//pos = pos - startpos;
if (2500.0f > fabs(pos.x()))
if(2500.0f > fabs(pos.y()))
if (2500.0f > fabs(pos.z()))
{
Vector3 planenormal;
//if (m_map.checkLaserCollision(l->getBbox(), l->getDirection(), switchhit, planenormal, p, false))
//{
// if (17.5 > l->getLifeTime() && !switchhit)
// {
// //Create scorch mark at the spot of the laser
// createScorchMark(l->getPosition(), -planenormal);
// }
// //Setup particle system when laser hits something
// ParticleSystemManager* psm = getWriteableGameResource()->getParticleSystemManager();
// ParticleEmitter* pe = psm->createEmitter(l->getPosition(), planenormal);
// pe->setMaxParticles(5.0f);
// pe->setEmissionRate(5.0f);
// pe->setParticleStartColor(Color::red());
// pe->setParticleKey1Color(Color::red());
// pe->setParticleKey2Color(Color::red());
// pe->setParticelEndColor(Color::red());
// pe->setParticleKey1Pos(0.33f);
// pe->setParticleKey2Pos(0.66f);
// pe->setParticleLifetime(1.0f);
// pe->setLifeTime(1.0f);
// pe->setParticleSize(0.75f);
// pe->setStartVelocity(7.5f);
// pe->setSpreadAngle(90.0f);
// pe->setAlive(true);
// //MSG_TRACE_CHANNEL("", sizeof(ParticleEmitter) << endl;
// eraseLaser(m_lasersit, l);
// continue;
//}
//l->move(elapsedtime);
m_lasersit++;
}
else
eraseLaser(m_lasersit, l);
else
eraseLaser(m_lasersit, l);
else
eraseLaser(m_lasersit, l);
}
m_scorchit = m_scorchmarks.begin();
while (m_scorchit != m_scorchmarks.end())
{
//cout << "Number of lasers: " << m_lasers.size();
ScorchMark* sm = *m_scorchit;
if (sm->getLifetime() < 0.0f)
{
delete sm;
m_scorchit = m_scorchmarks.erase(m_scorchit);
continue;
}
//sm->move(elapsedtime); update of the scorch mark takes care of this
m_scorchit++;
}
}