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61 lines
3.4 KiB
Plaintext
61 lines
3.4 KiB
Plaintext
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/*!
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\page fast_intersection_page Fast intersection
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This operation checks whether or not two selected shapes are overlapped.
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This tool is useful for fast detection of intersections and gaps.
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In contrast to Boolean Operations, Partition and Detect Self-intersection
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algorithms that compute topological intersections, this algoritm computes
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intersections by generating tessellation (triangulation) of the source
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shapes and detecting overlapping of resulting meshes. High performance is
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achieved through the use of existing triangulation of faces.
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Due to this fact, the tool is not suitable for computing exact intersection
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of shapes; however, it can be used to quickly find zones where
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intersections can present, and then use these results in further analysis.
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\note 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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\image html measures12.png
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\note This dialog supports navigation through the selectable objects (in OCC 3D viewer only):
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- Scroll mouse wheel with pressed \em Ctrl key or press \em "S", \em "P" keys when input focus is
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in the viewer to navigate between selectable objects.
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- Press left mouse button to select an appropriate object to the dialog box.
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.
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For more details, please refer to the \em "Functionality common for OCC and VTK viewers" chapter
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of the GUI module's documentation.
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In this dialog:
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- \b Object 1 - first checked object. \b Selection button allows picking it in the viewer or in the object browser.
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- \b Object 2 - second checked object. \b Selection button allows picking it in the viewer or in the object browser.
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- <b>Deflection coefficient</b> specifies the quality of shapes tessellation.
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- <b>Detect gaps</b> - when switched on, allows detecting gaps between shapes.
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- <b>Tolerance</b> - specifies a distance between shapes used for detecting gaps.
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- <b>Compute intersections</b> - press this button to compute interferences.
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- <b>Sub-shapes of Object 1</b> - list of sub-shapes from the first source shape that localize the intersection.
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- <b>Sub-shapes of Object 2</b> - list of sub-shapes from the second source shape that localize the intersection.
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- \b Apply and <b>Apply and Close</b> buttons are used to store selected intersected shapes in the study for
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further analysis (see below).
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\note Quality of the result depends on the quality of triangulation. Changing a value of the deflection coefficient
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parameter can strongly affect the result. On the other hand, small values of deflection coefficient might lead to
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some performance loss of the algorithm, as number of triangles of the tesselation mesh depends on this parameter.
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It is possible to store sub-shapes selected by the user in the study, for the further analysis.
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The selection will be published as a compound containing intersected sub-shapes from both source objects.
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<b>TUI Command:</b> <em>geompy.FastIntersect(theShape1, theShape2, theTolerance = 0.0, theDeflection = 0.001),</em> \n
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where:
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- \em theShape1 First shape.
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- \em theShape2 Second shape.
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- \em theTolerance When it is negative or equal to zero, the function detects intersections;
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when it is positive, the function detects gaps.
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- \em theDeflection Linear deflection for shapes; if deflection <= 0, default deflection 0.001 is used
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<b>Result:</b> Boolean + two lists of IDs of sub-shapes (from input shapes) that localize the intersection.
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See also a \ref tui_fast_intersection_page "TUI example".
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*/
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