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The
Healing Component (HEAL), in the
heal directory, fixes
solid models--usually imported from other modeling systems into
ACIS--in which tolerance problems affect how
ACIS interprets the model.
HEAL is designed to detect and correct accuracy problems in the geometry of an
ACIS model.
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It is possible to create
ACIS models that are not precise enough for
ACIS to process. This most often happens when geometry is created in some other modeling system and translated into an
ACIS model. Such models may be imprecise due to the inherent numerical limitations of their parent systems, or due to limitations of data transfer through neutral file formats. This imprecision can also result when an
ACIS model is created at a different tolerance from the current tolerance settings.
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This imprecision leads to problems such as geometric errors in entities, gaps between entities, and the absence of connectivity information (topology). Since
ACIS is a high precision modeler, it expects all entities to satisfy stringent data integrity checks for the proper functioning of its algorithms. Therefore, if such imprecise models must be processed by an
ACIS based system, a "healer" for such models is necessary to establish the desired precision and accuracy.
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The
Healing Component (HEAL) is designed to detect and correct accuracy problems in the geometry of an
ACIS model.
HEAL is intended as a foundation on which an application can build a complete "healing strategy." The
HEAL functionality is available through both a
C++ interface (APIs and classes) and a Scheme interface (Scheme extensions).
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HEAL is not a translator from another modeling system into
ACIS--the model must already exist in
ACIS format (e.g., in a SAT file) before being healed.
HEAL may not be able to correct all of the problems that may exist in a model, but it will detect and correct a large percentage of them.
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HEAL uses
aggregate attributes attached to the body and
individual attributes attached to the individual entities in the body to control the healing process. These attributes are used to store healing options, tolerances, and results. The attributes are implemented using the
ACIS attribute mechanism, with
C++ classes derived from the
ACIS base attribute class,
ATTRIB.
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The features of
HEAL include:
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Analyzes the input models and suggests appropriate tolerances for healing operations
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Provides user-controllable tolerances for efficient healing
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Simplifies geometry by converting spline data to analytic data wherever possible
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Stitches faces together in the absence of connectivity (topology) information
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Builds geometry to correct the gaps in the model
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Supports healing of analytic and spline tangent junctions
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Uses attributes attached to the body to store the information and results for the various healing phases, allowing the
HEAL changes of each phase to be reviewed
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Provides an "automatic" option for each of the various healing phases, including an
autoheal operation that performs all healing operations automatically
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Allows analyzing individual entities to determine the errors before performing any healing operations
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Allows converting edges that can't be healed into
ACIS tolerant edges
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