Hey, surfaces are defined by the parameters U and V the minimum is 0 and the maximum 1. 0 is equal to the starting of the surface and 1 is equal to the ending of the surface. There are four different ways showing the U-V-Orientation of a surface in CAESES/FFW. highlight a surface and in the ObjectEditor in the categorie Display Options click on this button . right-click the surface object in the ObjectTree and select 'Show U-V-Orientation' right-click the surface in the 3DViewer and select 'Show U-V-Orientation' highlight the surface and type this command in the Console: mycurve.showOrigin(1) to show the orientation and mycurve.showOrigin(0) for not showing the orientationBest Regards, Karsten