Drawing in 3D
By default, data points in a 3D model are placed at the view's Active Depth. Where you snap a tentative point or place a data point in a blank part of a view, it will be located at the active depth. You can, however, snap a tentative point to an existing element at any depth in a view. When you accept such tentative points, the data point is placed at the level of the snap point.
AccuDraw and its drawing plane, 3D data points and 3D tentative points, and 3D auxiliary coordinate systems, let you place elements away from the Active Depth. Often this improves productivity, since you need not constantly change the Active Depth.