This 3D software tutorial shows you how to use the cross section modifier in 3ds Max. The cross section modifier tool works on splines and is most often used when modeling with curves in 3D Studio Max. he CrossSection modifier creates a "skin" across multiple splines. It works by connecting the vertices of 3D splines to form a skin. The resulting object is another spline object that can be used with the Surface modifier to create a patch surface. These two modifiers, when used together, are sometimes referred to collectively as "Surface Tools." See how to work with these tools in this 3ds Max tutorial.