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why given only the quaternion, a pose can be determined

geometry_msgs::Pose target_pose1; target_pose1.orientation.w = 1.0; target_pose1.position.x = 0.28; target_pose1.position.y = -0.2; target_pose1.position.z = 0.5; move_group.setPoseTarget(target_pose1);

  • question: why given only the quaternion, a pose can be determined??

thanks!

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why given only the quaternion, a pose can be determined

line 121, 214, 337. eg,

geometry_msgs::Pose target_pose1;
target_pose1.orientation.w = 1.0;
target_pose1.position.x = 0.28;
target_pose1.position.y = -0.2;
target_pose1.position.z = 0.5;
move_group.setPoseTarget(target_pose1);

geometry_msgs::Pose target_pose1; target_pose1.orientation.w = 1.0; target_pose1.position.x = 0.28; target_pose1.position.y = -0.2; target_pose1.position.z = 0.5; move_group.setPoseTarget(target_pose1);

  • question: why given only the quaternion, a pose can be determined??

thanks!