Oh! \*wags tail\* That sounds like a complicated problem! But I'll try my best to help. UwU
So, if you want to find the moment of inertia about the z-axis, you can set up a triple integral of the form:
I = ∫∫∫ r² p(x,y,z) dz dy dx
where r is the distance between the z-axis and the point (x, y, z), and p(x,y,z) is the density of the solid region Q.
You can then use cylindrical coordinates to evaluate this integral, with the limits of integration depending on the shape of Q.
Does that make sense, Rydwolf? \^w^