void Camera::tick(const Time& t, const Duration& dt) {
if (!haveGoal()) return;
Vector3d goalPos = getGoalPosition();
Quaternion goalOrient = getGoalOrientation();
Vector3d pos;
Quaternion orient;
if (mMode == FirstPerson) {
// In first person mode we are tied tightly to the position of
// the object.
pos = goalPos;
orient = goalOrient;
}
else {
// In third person mode, the target is offset so we'll be behind and
// above ourselves and we need to interpolate to the target.
// Offset the goal.
BoundingSphere3f following_bounds = getGoalBounds();
goalPos += Vector3d(following_bounds.center());
// > 1 factor gets us beyond the top of the object
goalPos += mOffset * (following_bounds.radius());
// Restore the current values from the scene node.
pos = fromOgre(mSceneNode->getPosition(), mScene->getOffset());
orient = fromOgre(mSceneNode->getOrientation());
// And interpolate.
Vector3d toGoal = goalPos-pos;
double toGoalLen = toGoal.length();
if (toGoalLen < 1e-06) {
pos = goalPos;
orient = goalOrient;
} else {
double step = exp(-dt.seconds()*2.f);
pos = goalPos - (toGoal/toGoalLen)*(toGoalLen*step);
orient = (goalOrient*(1.f-step) + orient*step).normal();
}
}
mSceneNode->setPosition(toOgre(pos, mScene->getOffset()));
mSceneNode->setOrientation(toOgre(orient));
}
Vector3f getScale() const {
return fromOgre(mSceneNode->getScale());
}
Quaternion Camera::getOrientation() const {
return fromOgre(mSceneNode->getOrientation());
}
Vector3d Camera::getPosition() const {
return fromOgre(mSceneNode->getPosition(), mScene->getOffset());
}
Vector3d getOgrePosition() const {
return fromOgre(mSceneNode->getPosition(), getScene()->getOffset());
}
Quaternion getOgreOrientation() const {
return fromOgre(mSceneNode->getOrientation());
}
