# Point: definition (structure)

## Definition

A point is defined by:

• a number
• a type
• specific characteristics belonging to a type
• attributes of visibility

## Number

The number to identify the point is automatically allocated by Flux PEEC during the point creation.

## Types of points

The different types of points and the characteristics useful for their description are presented in the table below.

Point define by Description
its coordinates (parametric) Coordinate system for definition Local coordinates

propagation

from an other point

Transformation which define the propagation Origin point