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Using the
ACIS online help "index search can speed the interpretation of the information in a SAT file. The index search lists both class names and save identifiers.
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1.
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Locate the index entry for the save identifier of interest, for example, the class
BODY. Follow the index entry to the class information, of which the save identifier is a part.
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2.
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The first three lines of the SAT file contain header information. Parse these lines for information of value, such as the modeling units. For more details about the header, refer to the section
Save File Header.
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3.
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For an entity record within the SAT file, read the inner-most save identifier.
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a.
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For more details about entity records, refer to the section
Entity Records.
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b.
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For more details about the save identifiers, refer to the section
Save Identifiers.
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c.
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For more details about finding the inner-most save identifiers, refer to the section
Entity Encapsulation in a Record.
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4.
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Locate the index entry for the save identifier.
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5.
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Follow the index entry for the save identifier to its owning class description in the documentation.
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6.
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The restore methods of the class specify the data associated with that save identifier. This data begins just to the right of the inner-most save identifier of the SAT record. For more details about restore methods, refer to the section
Class Restore Methods.
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7.
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The data associated with the save identifier is represented by the pseudo code of the restore methods.
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8.
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The restore methods may reference restore methods for other classes. If required, go to those classes and follow their restore methods. Be sure to keep track of the class restore stack so that tracing can pop back to the correct class restore method.
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9.
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When finished with the data for the given save identifier, go to step 4. for the next inner-most save identifier, if applicable.
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10.
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If there are no more save identifiers and the data portion has encountered the entity record terminator ("#"), go to step 3. for the next entity record.
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For example, assume the following line was found in a SAT file.
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cone-surface $-1 0 0 0 0 0 1 10 0 0 1 I I 0 1 forward I I I I #
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The "surface" keyword is the inner-most save identifier which is next to the
NULLENTITY. pointer ($-1). The documentation index for the word "surface" leads to the
SURFACE class. So, this is the place to start tracing.
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SURFACE Class
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public: void SURFACE::restore_common ();
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No data
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This class does not save any data
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In this case, the restore method of the
SURFACE class does not read any data.
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CONE Class
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The "cone" keyword is the next inner-most save identifier. The documentation index for the word "cone" goes to the
CONE class.
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public: void CONE::restore_common ();
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cone::restore_data
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Cone data definition.
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The restore method of the
CONE class references the
restore_data method of the
cone class.
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cone Class
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public: void cone::restore_data ();
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ellipse::restore_data
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Restore the information for the base ellipse
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read_real
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Sine of cone angle
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read_real
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Cosine of cone angle
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if (restore_version_number < CONE_SCALING_VERSION)
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// the u parameter scale is obtained from the ellipse major axis
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else
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read_real
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u parameter scale
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if (restore_version_number < SURFACE_VERSION)
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// the reverse u flag is set to FALSE
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else
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read_logical
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u parameter reversed, either "forward" or reversed"
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surface::restore_data
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Generic surface data
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The restore method of the
cone class references the
restore_data method of the
ellipse class.
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ellipse Class
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public: void ellipse::restore_data ();
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read_position
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Position of the center of the ellipse.
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read_unit_vector
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Unit vector that is normal to plane of the ellipse.
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read_vector
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Major axis of the ellipse.
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read_real
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Ratio of the radii.
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curve::restore_data
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Restore the underlying curve of the ellipse.
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The restore method of the
ellipse class finally calls some input functions to retrieve information from the SAT file. Specifically, it reads the position of the base ellipse, which is the first "0 0 0" after the "$-1". It reads a unit vector for the base normal, which is the next "0 0 1". It reads a vector for the major axis of the ellipse, which is "10 0 0". It reads a real, "1", for the ratio of the ellipse major to minor axis. Then it accesses the restore method of the
curve class.
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curve Class
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public: void curve::restore_data ();
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if (restore_version_number >= BNDCUR_VERSION)
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read_interval
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Interval for the subset range.
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The restore method of the
curve class reads in an interval. The interval itself is made up of two logicals, which happen to be the next "I I", for two infinite values.
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The
curve::restore_data method returns to
ellipse::restore_data, which then returns to
cone::restore_data so that processing can resume. The next two values, "0 1", represent the sine and cosine of the cone angle, respectively. The
u parameter scale is obtained from the ellipse's major axis. It reads the logical "forward" before accessing the restore method of the
surface class.
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surface Class
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public: void surface::restore_data ();
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if (restore_version_number >= BNDSUR_VERSION)
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read_interval
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subset u interval
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read_interval
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subset v interval
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The
surface::restore_data method reads in two intervals which in this case are infinite, "I I I I".
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There are no other save identifiers to parse and the "#" indicates that there is no more data associated with that record.
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