A surface is generalized through the process of 3D double buffering. This process smooths the surface to reduce clutter and highlight significant shoals.
Double buffering is like rolling a ball over the surface at an interval determined by the surface’s node resolution. The radius of the ball is determined from the chart scale (radius = 1/100 of chart scale). As the ball is rolled over the surface, the surface is smoothed, but the shoals are retained.