Isoline is a 3D curve built on a bounded face limited by [Umin, Umax] and [Vmin, Vmax] values of U and V parameters. For all points of the isoline U or V parameter value is constant.

Result of this operation is either a single edge or a compound of edges.

To create an Isoline of a face in the Main Menu select New Entity - > Basic - > Isoline.

In this dialog:

Input or accept the default Name of the resulting shape.
Click the arrow button and select in the Object Browser or in the Viewer the Face, for which the Isoline is built.
Select along which coordinate: U-Isoline or V-Isoline the Isoline is built;
Set Parameter (ranging from 0 to 1), which defines the proportion, at which a face is divided by the isoline. If Parameter=0.5, the isoline is a median.
Press "Apply" or "Apply & Close" button to get the result (an edge or a compound of several edges).

This operation can be performed using a TUI Command:

geompy.MakeIsoline(theFace, IsUIsoline, theParameter)

Arguments: Name + Face + Type (True for U-Isoline; False for V-Isoline) + Parameter.

Example:

Isoline on a rectangle face

Our TUI Scripts provide you with useful examples of creation of Basic Geometric Objects.