Defining the Region of Interest

Model Reference Manual

Clash Detection : Defining the Region of Interest

By default, all parts of the design model relevant to the current obstruction list will be checked for interferences during subsequent clash-checking runs. If the user does not want to check the entire design, define a restricted region of interest represented by a 3D limits box.

For a clash to be reported, both items involved in the clash must lie wholly or partly within the limits box. A clash between items that lie partially within the limits box will always be reported, even if the point at which the clash occurs lies outside the box.

Set up a limits box in one of two ways:

•

Explicitly, using the LIMITS command, by defining the positions of two diametrically opposed corners (either as explicit co-ordinates or as the origins of specified elements).

•

Implicitly, using the AUTOLIMITS command, by identifying one or more elements and allowing MODEL to calculate the appropriate box that includes them. The limits box is calculated so as to include the whole of each named element (including touch and clearance values); it is not determined by the origins of the elements.


Examples:
LIMITS N2560 E12150 U2150 TO S6530 W2135 U4200	Sets corners of box to explicit coordinates.
LIMITS /STR6 TO /PUMP1	Sets corners of box to origins of named elements.
LIMITS S0 E1300 U0 FROM /NOZZ3 TO N650 E175 D50 FROM /VESS2	Sets corners of box to points referenced from origins of named elements.
AUTO /PUMP1 /PUMP2 /VESS2	Calculates box enclosing named elements.
AUTO /GROUP1	Calculates box enclosing all elements in named group.
AUTO HEAD OF /BRAN1-2 TAIL OF /BRAN3-1 AUTO /VESS1 /VESS2 LEAVE TUBE FROM /FLAN2	Calculates box enclosing named elements and implied tube or rod.
LIMITS NONE	Removes any current limits box, thus restoring default state in which whole design model is checked.

Command Syntax:

>---+--- LIMits ---.
    |              |
    |              +--- NONe ------------------------.
    |              |                                 |
    |              ‘--- <arpos> --- TO --- <arpos>---|
    |                                                |
    |                  .-----<------.                |
    |                 /             |                |
    ‘--- AUTOlimits ---*--- <clid> ----+------------------+->

where <clid> (clashing item identifier) is

and <arpos> (absolute/relative position) is

>---+--- <pos> ---+--- FROM --- <gid> ---.
    |             |                      |
    |             ‘----------------------|
    |                                    |
    ‘--- <gid> --------------------------+--->

Querying:


Q CLASH LIMits
	Gives coordinates for current limits box.
Q VOLume element_id(s)
	Gives coordinates for limits box enclosing specified design item(s).
Q WINdow <arpos> TO <arpos>
	Gives names of all elements within limits box specified by the two positions; for example:
Q WIN N2560 E12150 U2150 TO S6530 W2135 U4200
Q WIN /STR6 TO /PUMP1
Q WIN S0 E1300 U0 FROM /NOZZ3 TO N650 E175 D50 FROM /VESS2