Bodies with non-uniform mass distribution

[misho]

Is it possible to define a single body that would have a non-uniform mass distribution? As in, a bottom-heavy bowling pin?

[Julio Jerez]

you could if you calculate the inertia and you set explicitly.
you can use a compound to get he inertia of each part, and the use the parallel axis to ge the combine inertia and com.

That may be a cool functionality to ass to the compound, calculation the inertia for part with different mass density. do you need something like that?

[misho]

you could if you calculate the inertia and you set explicitly.
you can use a compound to get he inertia of each part, and the use the parallel axis to ge the combine inertia and com.

That may be a cool functionality to ass to the compound, calculation the inertia for part with different mass density. do you need something like that?

Yes, correct, I can calculate MOI on the fly. Absolutely, I would need something like that. The need arises from my space project, where a spacecraft has fuel/oxidiser/water tanks, and as they get depleted, the MOI changes, which really changes the balance of the spacecraft, with respect to how it reacts to control thrusters in zero gravity.

But, the same logic can be applied to air/surface vehicles (flight simulators - aircraft with fuel tanks, road vehicles...)