Each surface has user settings that determine how the surface is represented in a drawing. Surface settings allow you to include major and minor contour lines with the colors, line types, labels and contour intervals you want. Other Surface Settings allow you to draw the TIN lines and breaklines, use shading to deliniate the cut and fill areas or color in all the areas with a slope greater than 30 percent.
Contour settings - determine how the major and minor contours are drawn, their contour intervals, color, line types, etc. See Contour Settings and Contour Smoothing.
Tin settings - determine whether or not you show the triangles and breaklines that form the TIN. These are helpful when you are editing breaklines or looking for elevation blunders in your data. See TIN Settings.
Volume settings - you can choose to shade the areas of a surface that are cuts and fills as you compute volumes. This can be very helpful when conveying information about a surface to a client. See Volume Settings.
Slope settings - besides reporting areas of a surface within different slope classes, TPC can also shade the slopes for you, creating a nice presentation for a planning board. See Slope Analysis.
Each surface has its own settings (the default settings) which allows the surface to be displayed the same way in any number of drawings. But when you need it, a surface can be displayed in a drawing using Unique Surface Settings. The unique surface settings are used instead of the surfaces default settings, allowing you to change contour intervals, colors, line types or whatever.
The surface settings also include which layers the surfaces drawing objects are placed on. See Surface Layers.