--- Convert a pos to a human-readable string
-- @param pos The position
-- @return A readable string of the form (x,y,z)
function postostr(pos)
    if pos == nil then return "(nil)" end
    return "("..pos.x..","..pos.y..","..pos.z..")"
end

--- Get a copy of a position
-- @param pos The position
-- @return An identical position
function poscopy(pos)
    return {x=pos.x,y=pos.y,z=pos.z}
end

--- Check if two 3d vectors are equal
function v3equal(v1, v2)
    return v1.x == v2.x and v1.y == v2.y and v1.z == v2.z
end

function v3posround(v1)
    local posround = function(n)
        return math.floor(n+0.5)
    end
    return {x=posround(v1.x), y=posround(v1.y), z=posround(v1.z)}
end