In addition, depending on the context described by the rule instructions,
actions can be executed:
- To set a value or a formula to parameters, including feature
activity.
- To display information windows.
- To affect points, curves and surfaces and thus allow contextual
and automatic topological changes.
In the tree, the rule appears as a relation that
can be activated or deactivated. Like any feature, a rule can be manipulated
from its context menu. A rule is executed when one of its input parameters
has changed or when one of its input features has changed and if you
require the update of the rule. The consequence is that it is impossible
for you to completely control when the rule is to be fired. As
a result, rules can only manipulate parameters and features and are
to be used to control the status of a design (change of parameters and
geometry).
Notes:
- Names starting with forbidden characters or digits are not managed properly in rules. If you want to use such characters, put them in simple quotes.
- When a rule or a reaction is triggered,
the update of the input objects is triggered prior to the firing of
this rule/reaction.
- If you access a feature attribute in a rule, the modification of the attribute value does not launch a new evaluation of the rule. Only parameters modifications (parameters available in the Formula Editor) launch a new evaluation of the rule.