mirror of
https://git.salome-platform.org/gitpub/modules/geom.git
synced 2024-12-28 02:10:36 +05:00
61 lines
3.4 KiB
Plaintext
61 lines
3.4 KiB
Plaintext
/*!
|
|
\page fast_intersection_page Fast intersection
|
|
|
|
This operation checks whether or not two selected shapes are overlapped.
|
|
|
|
This tool is useful for fast detection of intersections and gaps.
|
|
In contrast to Boolean Operations, Partition and Detect Self-intersection
|
|
algorithms that compute topological intersections, this algoritm computes
|
|
intersections by generating tessellation (triangulation) of the source
|
|
shapes and detecting overlapping of resulting meshes. High performance is
|
|
achieved through the use of existing triangulation of faces.
|
|
Due to this fact, the tool is not suitable for computing exact intersection
|
|
of shapes; however, it can be used to quickly find zones where
|
|
intersections can present, and then use these results in further analysis.
|
|
|
|
\note For more information about Partition and Boolean Operations Algorithms
|
|
and their limitations refer to <a href="SALOME_BOA_PA.pdf">this document</a>.
|
|
|
|
\image html measures12.png
|
|
|
|
\note This dialog supports navigation through the selectable objects (in OCC 3D viewer only):
|
|
- Scroll mouse wheel with pressed \em Ctrl key or press \em "S", \em "P" keys when input focus is
|
|
in the viewer to navigate between selectable objects.
|
|
- Press left mouse button to select an appropriate object to the dialog box.
|
|
.
|
|
For more details, please refer to the \em "Functionality common for OCC and VTK viewers" chapter
|
|
of the GUI module's documentation.
|
|
|
|
In this dialog:
|
|
|
|
- \b Object 1 - first checked object. \b Selection button allows picking it in the viewer or in the object browser.
|
|
- \b Object 2 - second checked object. \b Selection button allows picking it in the viewer or in the object browser.
|
|
- <b>Deflection coefficient</b> specifies the quality of shapes tessellation.
|
|
- <b>Detect gaps</b> - when switched on, allows detecting gaps between shapes.
|
|
- <b>Tolerance</b> - specifies a distance between shapes used for detecting gaps.
|
|
- <b>Compute intersections</b> - press this button to compute interferences.
|
|
- <b>Sub-shapes of Object 1</b> - list of sub-shapes from the first source shape that localize the intersection.
|
|
- <b>Sub-shapes of Object 2</b> - list of sub-shapes from the second source shape that localize the intersection.
|
|
- \b Apply and <b>Apply and Close</b> buttons are used to store selected intersected shapes in the study for
|
|
further analysis (see below).
|
|
|
|
\note Quality of the result depends on the quality of triangulation. Changing a value of the deflection coefficient
|
|
parameter can strongly affect the result. On the other hand, small values of deflection coefficient might lead to
|
|
some performance loss of the algorithm, as number of triangles of the tesselation mesh depends on this parameter.
|
|
|
|
It is possible to store sub-shapes selected by the user in the study, for the further analysis.
|
|
The selection will be published as a compound containing intersected sub-shapes from both source objects.
|
|
|
|
<b>TUI Command:</b> <em>geompy.FastIntersect(theShape1, theShape2, theTolerance = 0.0, theDeflection = 0.001),</em> \n
|
|
where:
|
|
- \em theShape1 First shape.
|
|
- \em theShape2 Second shape.
|
|
- \em theTolerance When it is negative or equal to zero, the function detects intersections;
|
|
when it is positive, the function detects gaps.
|
|
- \em theDeflection Linear deflection for shapes; if deflection <= 0, default deflection 0.001 is used
|
|
|
|
<b>Result:</b> Boolean + two lists of IDs of sub-shapes (from input shapes) that localize the intersection.
|
|
|
|
See also a \ref tui_fast_intersection_page "TUI example".
|
|
|
|
*/ |