JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. To Split a Surface At Crease Iso Curves Select the Split Surface tool ( Modeling > Surfaces > Modify Surfaces ). Set the Method to At Crease Iso Curves. Select the surface. Accept/Reset. A crease line can be created by combining two surfaces with the Combine Surfaces tool. In this example the color of one side of the split has been changed. Parent topic: Split Surface