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tf2::convert is not designed to convert one message to a different message. http://docs.ros.org/kinetic/api/tf2/html/impl_2convert_8h_source.html

Technically, geometry_msgs::Transform and geometry_msgs::Pose are different data, though I frequently find that I want to convert between the two. You can overload "convert" or use a different function name in a helper file.

namespace tf2
{
    inline
    void convert(const geometry_msgs::Transform& trans, geometry_msgs::Pose& pose)
    {
        pose.orientation = trans.rotation;
        pose.position.x = trans.translation.x;
        pose.position.y = trans.translation.y;
        pose.position.z = trans.translation.z;
    }

    inline
    void convert(const geometry_msgs::Pose& pose, geometry_msgs::Transform& trans)
      {
        trans.rotation = pose.orientation;
        trans.translation.x = pose.position.x;
        trans.translation.y = pose.position.y;
        trans.translation.z = pose.position.z;
    }

    inline
    void convert(const geometry_msgs::TransformStamped& trans, geometry_msgs::PoseStamped& pose)
    {
        convert(trans.transform, pose.pose);
        pose.header = trans.header;
    }

    inline
    void convert(const geometry_msgs::PoseStamped& pose, geometry_msgs::TransformStamped& trans)
    {
        convert(pose.pose, trans.transform);
        trans.header = pose.header;
    }
}