Load a model and translate the center of its bounding sphere to the origin

CenteredModel.lua

function NodeLocationAndSize(node)
    local bound = node:getBound()
    print("Position:", bound:center())
    print("Bounding sphere radius:", bound:radius())
end

function CenteredModel(name)
    local m = Model(name)
    NodeLocationAndSize(m)
    local bound = m:getBound()
    --local parent = osg.PositionAttitudeTransform
    return Transform{
        position = -bound:center();
        m
    }
end