OBSTRUCTION

The OBSTRUCTION attribute is used to declare whether an element is solid or not. Obstructions can be declared as Hard, Soft or No Obstruction, depending on the value of the OBSTRUCTION attribute. The default value of 2 results in a Hard obstruction, 1 results in a Soft obstruction (used for walkways, maintenance access ) and 0 is for No Obstruction (used to save computing time when elements are enclosed in another element which acts as an overall obstruction).