function isNan(v)
    return v ~= v
end


function clamp(v, min, max)
	return math.max(math.min(v, max), min)
end


function lerp(a, b, t)
	local v = a + (b - a) * t
	if a > b then
		return clamp(v, b, a)
	else
		return clamp(v, a, b)
	end
end


function roundMultiple(v, m)
    local a = math.floor(v / m) * m;
    local b = a + m;
  
    if v - a > b - v then
    	return b
    else
    	return a
    end
end