Model Reference Manual
Design Templates
:
Design Template Hierarchy
: Control of Negative Primitive Application
Control of Negative Primitive Application
Negatives owned by positive primitives directly under a Template, or deeper in the component hierarchy behave as normal design primitives in that they are removed from their owner's geometry to create holes and notches.
A Template can also directly own negatives, which, in isolation, have nothing to be applied to. These negatives act in the same way as negatives within Negative Geometry sets in the Catalogue database. Together these apply to the template geometry as a whole, or the geometry of other associated items in the context of the element whose geometry is defined by the template. For example a joint can be defined by a catalogue item, or a template, and both need to be able to modify the geometry of an attached section element (SCTN or GENSEC) and/or the geometry of the beam element on which the joint has been welded or bolted.
To determine the behaviour of these negative geometry elements each has a Negative Application attribute (NAPP). Refer to Negative Geometry Sets in the Catalogue and Specification Reference manual for further information.
Key values of NAPP are:
0
Negative Primitive will not be removed from anything.
1
Negative Primitive will be removed from the item Attached to the owner of the Template geometry. The template user will be a joint type element (SJOI,SUBJ,FIXING etc), and the attached elements will be either a SCTN or a GENSEC
2
Negative Primitive will be removed from its 'significant' Owner or hierarchical owner. The template user will be a Fitting (FITT, PFIT, FIXING, SBFI etc.) and the hierarchical owner will be a PANEL, SCTN or GENSEC.
4
Negative Primitive will be removed from the item using the Template itself. This item could be any type of element. In the case of FIXINGs subsidiary to other fixings, both the subsidiary and owning compound fixing will be operated on as the item itself.
Other values of NAPP are allowed and will be additions of 1, 2 and 4 to allow the negative primitive to operate on any combination of attached, owner and itself.
1974 to current year.
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