Multiple Object Selection in Pattern Hierarchies
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Author(s)
Jang, Justin
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Abstract
Hierarchies of patterns of features, of subassemblies,
or of CSG sub-expressions are used in
architectural and mechanical CAD to eliminate laborious
repetitions from the design process. Yet, often the
placement, shape, or even existence of a selection of
the repeated occurrences in the pattern must be adjusted.
The specification of a desired selection of occurrences
in a hierarchy of patterns is often tedious
(involving repetitive steps) or difficult (requiring interaction
with an abstract representation of the hierarchy
graph). The OCTOR system introduced here addresses
these two drawbacks simultaneously, offering an effective
and intuitive solution, which requires only two
mouse-clicks to specify any one of a wide range of
possible selections. It does not require expanding the
graph or storing an explicit list of the selected occurrences
and is simple to compute. It is hence well suited
for a variety of CAD applications, including CSG, feature-based design, assembly mock-up, and animation.
We discuss a novel representation of a selection, a
technology that makes it possible to use only two
mouse-clicks for each selection, and the persistence of
these selections when the hierarchy of patterns is edited.
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Date
2007
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Resource Type
Text
Resource Subtype
Technical Report