Is there any way to get the surface area, center of mass, cross-sectional area, and volume of a part, group of parts, or meshes? This is easy to get for simple shapes, such as cubes and cylinders, but gets difficult when custom shapes are applied. I am planning to use this to create *somewhat* of aerospace simulator, similar to Kerbal Space Program, but haven’t figured out where to start in this subject.

If you know the mass and density of an object, you can just calculate the volume using: V(Volume) = m(Mass) / ρ(Density) You can check the density of certain materials online and multiply them with a factor so it’s suitable for Roblox.

If you take the average x,y,z of all the “corners” of your object, you can calculate the center of mass.

For center of mass Roblox has a property which conveniently isn’t live yet: https://developer.roblox.com/api-reference/property/BasePart/CenterOfMass

for volume you can do what aux said, but instead of getting the density off the internet, you can just use ‘part.CustomPhysicalProperties.Density’

I don’t think it’s possible to do surface area/cross section through Roblox yet, in your situation are you allowed to precompute the values/use httpservice to calculate them?

Your equation is wrong. Density = Mass / Volume therefore Volume = Mass / Density.

For the cross-sectional area of a mesh, this is possible if you also import the mesh’s obj data. I don’t know the math for it, but it’s at least possible. This would also work for static unions, but you’re out of luck for dynamically created unions in-game.

Haven’t experimented with them, but I would if I decided to learn how to use them.