typedef int PK_mass_t; Controls the level of mass property calculation Values can be: PK_mass_no_c Do not find any data in this hierarchy PK_mass_mass_c Find the amount and mass of the entities PK_mass_c_of_g_c Find the centre of gravity as well PK_mass_m_of_i_c Find the moments of inertia as well The default value is PK_mass_m_of_i_c