balls, cylinders, and blocks all have the mass computed correctly.
wedges and cornerwedges are 2x and 3x denser than the user definable density value.
--Here's how roblox currently computes them:
wedgeMass = density*x*y*z
cornerwedgeMass = density*x*y*z
--Here's what they should be:
wedgeMass = density*x*y*z/2
cornerwedgeMass = density*x*y*z/3
Center of mass appears to be computed correctly.