问统一物理学-如何使物体下垂，然后像在太空中与重力一样？

EN

double liftForce(object)
{
    const double waterLevel = 0.0;
    const double density = 1000.0; // kg/m^3 -- using water atm

    double vol = volumeBeneathSurface(object, waterLevel);

    double displacedMass = vol*density; // density = m/vol
    double displacedWeight = displacedMass*gravity; // F = m*a
    return displacedWeight;
}

double volumeBeneathSurface(object, double surfaceLevel)
{
     // assuming the object has `height`, `width`, and `depth`
     // also assuming its coordinate is references from the center of the object
     double r = object.y - surfaceLevel - object.height/2.0; // How much of the object is beneath the surface
     if (r > 0)
         return 0.0; // the object is purely above
     else if (r < object.height)
         return object.height*object.width*object.depth; // the whole object is beneath
     else
         return abs(r)*object.width*object.depth; // partly under
}