Model Reference Manual
Equipment and Primitives : Primitive Modelling Attributes : Obstruction Settings
Obstruction Settings
Keywords:
OBSTRUCTION
Description:
The OBSTRUCTION attribute indicates to the clash detection facility whether a primitive should be considered as a ‘Hard’ or ‘Soft’ obstruction, or not at all. Obstructions can be specified as HARD, SOFT or NONE, or alternatively they can be specified numerically as follows:
For ordinary primitives, the following rules apply:
•
No obstruction (internal graphical details)
•
Soft obstruction (access volumes etc.)
•
Hard obstruction (vessel ‘envelopes’ etc.).
Holes (i.e. negative primitives) also have the OBSTRUCTION attribute. OBSTRUCTION settings for Nozzles and Piping are given in the Catalogue.
Note:
Refer to Display for further information of the Spatial Map which is used during clash-checking.
 
Examples: 
OBST SOFT
(At a primitive)
Current Element will be considered as a ‘soft’ obstruction.
OBST HARD
(At a primitive)
Current Element will be considered as a ‘hard’ obstruction.
OBST NONE
(At a primitive)
Current Element will be ignored during clash detection.
OBST 2
(At a primitive)
Current Element will be considered as a ‘hard’ obstruction.
Command Syntax:
>-- OBStruction --+-- integer --.
                  |             |
                  |-- HARD -----|
                  |             |
                  |-- SOFT -----|
                  |             |
                  ‘-- NONE -----+-->
Figure 7:3.
Obstruction settings for use in clash detection
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