void CharacterDemo::updateCamera()
{
//#define DISABLE_CAMERA 1
#ifdef DISABLE_CAMERA
DemoApplication::updateCamera();
return;
#endif //DISABLE_CAMERA
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
btTransform characterWorldTrans;
//look at the vehicle
characterWorldTrans = m_ghostObject->getWorldTransform();
btVector3 up = characterWorldTrans.getBasis()[1];
btVector3 backward = -characterWorldTrans.getBasis()[2];
up.normalize ();
backward.normalize ();
m_cameraTargetPosition = characterWorldTrans.getOrigin();
m_cameraPosition = m_cameraTargetPosition + up * 10.0 + backward * 12.0;
//use the convex sweep test to find a safe position for the camera (not blocked by static geometry)
btSphereShape cameraSphere(0.2f);
btTransform cameraFrom,cameraTo;
cameraFrom.setIdentity();
cameraFrom.setOrigin(characterWorldTrans.getOrigin());
cameraTo.setIdentity();
cameraTo.setOrigin(m_cameraPosition);
btCollisionWorld::ClosestConvexResultCallback cb( characterWorldTrans.getOrigin(), cameraTo.getOrigin() );
cb.m_collisionFilterMask = btBroadphaseProxy::StaticFilter;
m_dynamicsWorld->convexSweepTest(&cameraSphere,cameraFrom,cameraTo,cb);
if (cb.hasHit())
{
btScalar minFraction = cb.m_closestHitFraction;//btMax(btScalar(0.3),cb.m_closestHitFraction);
m_cameraPosition.setInterpolate3(cameraFrom.getOrigin(),cameraTo.getOrigin(),minFraction);
}
//update OpenGL camera settings
glFrustum(-1.0, 1.0, -1.0, 1.0, 1.0, 10000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(m_cameraPosition[0],m_cameraPosition[1],m_cameraPosition[2],
m_cameraTargetPosition[0],m_cameraTargetPosition[1], m_cameraTargetPosition[2],
m_cameraUp.getX(),m_cameraUp.getY(),m_cameraUp.getZ());
}
bool Cam_HasHit(std::shared_ptr<BtEngineClosestConvexResultCallback> cb, btTransform &cameraFrom, btTransform &cameraTo)
{
btSphereShape cameraSphere(16.0);
cb->m_closestHitFraction = 1.0;
cb->m_hitCollisionObject = NULL;
bt_engine_dynamicsWorld->convexSweepTest(&cameraSphere, cameraFrom, cameraTo, *cb);
return cb->hasHit();
}
bool Cam_HasHit(std::shared_ptr<BtEngineClosestConvexResultCallback> cb, btTransform &cameraFrom, btTransform &cameraTo)
{
btSphereShape cameraSphere(COLLISION_CAMERA_SPHERE_RADIUS);
cameraSphere.setMargin(COLLISION_MARGIN_DEFAULT);
cb->m_closestHitFraction = 1.0;
cb->m_hitCollisionObject = nullptr;
bt_engine_dynamicsWorld->convexSweepTest(&cameraSphere, cameraFrom, cameraTo, *cb);
return cb->hasHit();
}
