Reference planes

Graphic interaction with form•Z is interpreted relative to the active reference plane. A reference plane is a plane in 3D space used as the workspace for drawing and the basis for other interactive actions. The initial reference plane is the XY plane (or ground plane). The reference plane may be one of the three Cartesian planes (XY, YZ, ZX), or it may be a custom plane. A custom plane can be positioned anywhere in 3D space and is defined from faces of an object or is derived from one of the Cartesian reference planes. A special type of custom plane is the face reference plane, which is created automatically when using a tool for drawing objects and the mouse is positioned on a face of an existing object.


By default, reference planes are shown with a grid and axes. The X axis is displayed red, the Y green, and the Z blue. The color of the grid and axes is controlled by settings in the Appearance tab of the Project Settings dialog (accessed from the File menu). The display of the grid and axes can be disabled with tools in the Display tool palette.


The Reference Plane tool palette is located at the bottom left edge of the screen.


Arbitrary Plane.tif Module and Divisions: A grid may be drawn depicting the reference plane, depending on whether Show Grid is selected in the Display menu. The density of the grid is specified by the values in these two fields. The module value specifies the interval at which a heavy line is drawn. The divisions value specifies the number of subdivisions in each module. These subdivisions are drawn in lighter lines.