Solids Builder - Flow Decision

Flow Decision - allows a decision like (if - then - else) or (if - then-else)

An IF activity requires an expression to evaluate to true or false, to decide which path to take in the flowchart.

This expression must obey the syntax of programs written in Visual Basic, such as:

• A > B - assuming A and B are numbers for example
• P1.X = P2.X - assuming that P1 and P2 are points, X would be the abscissa
• A = "1" - assuming A is a string

In the example below, using the IF allows you to decide whether the model will create a Double pipe, or whether it will create a single or triple pipe, depending on the next decision. Note the relationships between the PipeLines property in the Property Creation panel, in the Designer and in the Properties panel:

The IF cannot be called as a variable, so allow it to have a name that doesn't respect the activity naming rules.