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64 lines
3.4 KiB
Plaintext
64 lines
3.4 KiB
Plaintext
/*!
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\page check_self_intersections_page Detect Self-intersections
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\n To <b>Detect Self-intersections</b> in the <b>Main Menu</b> select
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<b>Inspection - > Detect Self-intersections</b>.
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There are two ways to check self-intersections.
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\anchor check_self_intersections_topological
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<br><h3>Check topological intersections</h2>
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This operation checks the topology of the selected shape to detect self-intersections.
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\image html measures11.png
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In this dialog:
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- \b Object - the checked object. \b Selection button allows picking it in the viewer or in the object browser.
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- <b>Level of check</b> - combo box allows setting the level of self-interference checking. It defines, which interferences will be checked. The default value is "All interferences".
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- <b>Compute self-intersections</b> button performs the computation.
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- \b Summary section contains the general report about self-intersections of the object and/or errors that occurred during the computation.
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- \b Self-intersections list contains the list of detected self-intersections. Select the intersection to show <b>Sub-shapes</b> in the field to the right.
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- \b Apply and <b>Apply and Close</b> buttons store the interferences selected in the <b>Self-intersections</b> list box in the study for further analysis.
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If no interferences are selected, all of them are published in the study. Each interference is published as a child compound of the source shape and contains a couple of intersecting sub-shapes.
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\note This tool is useful for detection of shapes that are not suitable as
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arguments of Boolean operations and Partition algorithm.
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For more information about Partition and Boolean Operations Algorithms
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and their limitations refer to <a href="SALOME_BOA_PA.pdf">this document</a>.
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\n <b>Result:</b> Boolean.
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\n <b>TUI Command:</b> <em>geompy.CheckSelfIntersections(theShape, theCheckLevel = GEOM.SI_ALL),</em> \n
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where: \n
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\em theShape is the shape checked for validity. \n
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\em theCheckLevel is the level of check. Default value is GEOM.SI_ALL to check all interferences.
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See also a \ref tui_check_self_intersections_page "TUI example".
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\anchor check_self_intersections_fast
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<br><h3>Fast intersection</h2>
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This operations allows to quickly detect self-interferences of the given shape by means of algorithm based on mesh intersections.
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\image html measures13.png
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This algorithm works on the faces level, i.e. it computes only face-to-face intersections. No additional types of intersections is computed.
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This case can be useful in order to detect all the intersections between the subshapes of type "surface" inside assembly.
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Quality of result will depend on the quality of tesselation (managed via the deflection parameter). However, small values of deflection can
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significantly decrease performance of the algorithm.
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Nevertheless, performance of Fast Intersect algorithm is much higher than topological intersection.
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\n <b>Result:</b> Boolean.
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\n <b>TUI Command:</b> <em>geompy.CheckSelfIntersectionsFast(theShape, theDeflection, theTolerance),</em> \n
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where: \n
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\em theShape is the shape checked for validity. \n
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\em theDeflection is a linear deflection coefficient that specifies quality of tesselation. If theDeflection <= 0, default deflection 0.001 is used.
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\em theTolerance Specifies a distance between shapes used for detecting gaps:
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- if theTolerance <= 0, algorithm detects intersections;
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- if theTolerance > 0, algorithm detects gaps.
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See also a \ref tui_check_self_intersections_fast_page "TUI example".
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*/ |