## Description

The *Planes* command is available regardless of current selection. This command will create new database plane entities that can be further used
for intersections with other database entities, for projection of grid
entities, for mirror planes when using the *Mirror* transformation, or for split planes
when splitting selected shell entities.

**Tip:** Planes are excellent for computing intersections with other geometry surfaces at convenient locations for placing connectors. For
instance, inter-secting a axisymmetric body at either end of a control surface with planes. This will create database curves that are easy to use for
connector creation and quickly block in the control surface.

Select *Create, Planes*. Choose the *Plane Mode* you wish to use to define your new plane and set the location using the corresponding mode
frame. Click on *OK* to save the new database plane and close the panel.

Use the Planes command to create new database planes.

The *Planes* panel contains two frames. The first, *Plane Mode*, allows you to choose the type of definition you wish to use. The second frame
will always be labeled to match the current plane mode. For instance, when using the default mode, *Constant X*, *Y*, or *Z*, the second
frame is labeled *Constant X*, Y, or Z respectively. Each mode will be discussed in detail here.

When using *Point and Normal* mode, first select or click a point in the *Display* window or enter the point coordinates directly into
the *XYZ* text field. Then enter a directional vector into the *Direction* text field or choose a primary axis direction using *Use
X-Axis*, *Use Y-Axis*, or *Use Z-Axis*. Note that once the point is placed, it can be edited either graphically in the *Display*
window or via the *XYZ* text field.

Use the Point and Normal mode to create a database plane defined by a point and a normal vector.

The *Three Points* mode simply requires input of three points, either selected or clicked in the *Display* window, or input sequentially via
the *XYZ* text field.

Use the Three Points mode to create a database plane defined by three points.

Use the *Constant X*, *Y*, or *Z* mode to create a constant coordinate plane. First choose the coordinate for which you wish to create
the plane. Then enter the coordinate value in the corresponding text field.

Use the Constant X, Y, or Z mode to quickly create a constant coordinate plane.

Use *Coefficients* mode to define a plane using the four mathematical coefficients found in the equation of a plane. Simply enter the coefficients
using the provided *A*, *B*, *C*, and *D* text fields.

Use the Coefficients mode to define a plane using the four mathematical coefficients found in the equation of a plane.