  Two-qubit Bell-diagonal states can be depicted as a tetrahedron in three
dimensions. We investigate the structure of quantum resources, including
coherence and quantum discord, in the tetrahedron. The ordering of different
resources measures is a common problem in resource theories, and which measure
should be chosen to investigate the structure of resources is still an open
question. We consider the structure of quantum resources which is not affected
by the choice of measure. Our work provides a complete structure of coherence
and quantum discord for Bell-diagonal states. The pictorial approach also
indicates how to explore the structure of resources even when we don't have
consistent measure of a concrete quantum resource.
