A field object allows assigning some values to geometrical entities. These values can be later transferred to mesh entities generated on the geometrical entities during export to MED file in Mesh module. Geometrical fields can be stored in/restored from XAO format files.

A field object assigns values to either

all vertices of a GEOM_Object or
all edges of a GEOM_Object or
all faces of a GEOM_Object or
all solids of a GEOM_Object or
the whole GEOM_Object.

Values can be of one of the following types:

boolean,
integer,
double,
string.

Note: Only integer and double values can be exported into the MED file.

The field can hold several named values (components) per a geometrical entity.

The field can include several sets of data called steps, each dedicated to a certain time moment. A step is described by

an integer ID,
a time stamp number,
values.

To create a field, in the Main Menu select New Entity -> Field -> Create Field.

Create Field dialog

In this dialog you can:

Set Field Name with which a field will appear in the Object Browser.
Select a Shape to which the field values will be assigned.
Select a Type of field values.
Select a type of Sub-shapes to assign values to.
Specify Nb. Components per a shape/sub-shape.
Specify names of components and the values in a table of Values. (To change a component name, double-click a column header).
Push Add Step button to add a new time step. (Specify a step ID in Step field before pushing this button).
Adjust a time stamp number in Stamp field.
Push Previous Step and Next Step buttons to navigate through added steps or use a drop-down list to the right of the Step field to select a step by its ID.
Push Remove Step to delete a current step.
Push Apply or Apply and Close button to commit creation of the field.

Later you can modify the values and the time stamp number of a created field and to add/remove steps to it. To do it, choose Edit Field in a contextual menu of a field or step in the Object Browser.

Python API for field manipulations includes the following commands:

field          = geompy.CreateField(shape, name, type, dimension, componentNames)
geompy.RemoveField(field)
shape          = field.getShape()
name           = field.getName()
field.setName(name)
type           = field.getType()
dim            = field.getDimension()
componentNames = field.getComponents()
nbFileds       = geompy.CountFields(shape)
fields         = geompy.GetFields(shape)
field          = geompy.GetField(shape, name)

field.addStep(stepID, stamp, values)
field.removeStep(stepID)
nbSteps        = field.countSteps()
stepIDs        = field.getSteps()
stamp          = field.getStamp(stepID)
field.setStamp(stepID, stamp)
values         = field.getValues(stepID)
field.setValues(step, values)

Our TUI Scripts provide you with examples of GEOM fields creation.