void CameraProxy::_update_following(double dt) {
if(following_actor_ && stage->has_actor(following_actor_)) {
float t = (fabs(following_lag_) < kmEpsilon) ? 1.0 : dt * (1.0 / following_lag_);
auto actor = stage->actor(following_actor_);
Vec3 avatar_position = actor->absolute_position();
Quaternion avatar_rotation = actor->absolute_rotation();
Quaternion initial_rotation = absolute_rotation();
Vec3 initial_position = absolute_position();
Vec3 destination_position;
Quaternion destination_rotation;
if(following_mode_ == CAMERA_FOLLOW_MODE_DIRECT) {
destination_position = avatar_position + following_offset_.rotated_by(avatar_rotation);
destination_rotation = calc_look_at_rotation(avatar_position);
} else if(following_mode_ == CAMERA_FOLLOW_MODE_THIRD_PERSON) {
float yaw = kmQuaternionGetYaw(&avatar_rotation);
kmQuaternionRotationPitchYawRoll(&destination_rotation, 0, yaw, 0);
destination_position = following_offset_.rotated_by(destination_rotation) + avatar_position;
} else {
throw std::logic_error("Unknown camera follow mode");
}
set_absolute_position(initial_position.lerp(destination_position, t));
set_absolute_rotation(initial_rotation.slerp(destination_rotation, t));
} else {
//The actor was destroyed, so reset
following_actor_ = ActorID();
}
}
float Camera::getYaw() const
{
return kmQuaternionGetYaw(&mCamera.cameraNode.rotation);
}
