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0029734: Modeling Algorithms - Compute global properties of tessellated shape

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New algorithms calculating global properties on mesh data have been added:
- BRepGProp_MeshCinert computes the global properties of polylines represented by a set of points;
- BRepGProp_MeshProps computes the global properties of a surface mesh.

Existing tool BRepGProp now automatically uses new algorithm for triangulation-only faces.
By default, algorithm will use exact geometry objects (surfaces), when it is available (as before the patch);
this behavior can be switched by a new flag UseTriangulation, forcing usage of triangulation instead of exact geometry when both defined.
This commit is contained in:
ifv
2018-05-17 15:38:17 +03:00
committed by kgv
parent a820bd4f13
commit 4b114473ef
15 changed files with 1090 additions and 105 deletions
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28
src/BRepTest/BRepTest_GPropCommands.cxx
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@@ -41,16 +41,25 @@ Standard_IMPORT Draw_Viewer dout;
Standard_Integer props(Draw_Interpretor& di, Standard_Integer n, const char** a)
{
if (n < 2) {
di << "Use: " << a[0] << " shape [epsilon] [c[losed]] [x y z] [-skip] [-full]\n";
di << "Compute properties of the shape\n";
di << "Use: " << a[0] << " shape [epsilon] [c[losed]] [x y z] [-skip] [-full] [-tri]\n";
di << "Compute properties of the shape, exact geometry (curves, surfaces) or\n";
di << "some discrete data (polygons, triangulations) can be used for calculations\n";
di << "The epsilon, if given, defines relative precision of computation\n";
di << "The \"closed\" flag, if present, do computation only closed shells of the shape\n";
di << "The centroid coordinates will be put to DRAW variables x y z (if given)\n";
di << "Shared entities will be take in account only one time in the skip mode\n";
di << "All values are outputted with the full precision in the full mode.\n\n";
di << "All values are outputted with the full precision in the full mode.\n";
di << "Preferable source of geometry data are triangulations in case if it exists, if the -tri key is used.\n";
di << "If epsilon is given, exact geometry (curves, surfaces) are used for calculations independently of using key -tri\n\n";
return 1;
}
Standard_Boolean UseTriangulation = Standard_False;
if (n >= 2 && strcmp(a[n - 1], "-tri") == 0)
{
UseTriangulation = Standard_True;
--n;
}
Standard_Boolean isFullMode = Standard_False;
if (n >= 2 && strcmp(a[n-1], "-full") == 0)
{
@@ -86,11 +95,11 @@ Standard_Integer props(Draw_Interpretor& di, Standard_Integer n, const char** a)
}
else {
if (*a[0] == 'l')
BRepGProp::LinearProperties(S,G,SkipShared);
BRepGProp::LinearProperties(S, G, SkipShared, UseTriangulation);
else if (*a[0] == 's')
BRepGProp::SurfaceProperties(S,G,SkipShared);
BRepGProp::SurfaceProperties(S, G, SkipShared, UseTriangulation);
else
BRepGProp::VolumeProperties(S,G,onlyClosed,SkipShared);
BRepGProp::VolumeProperties(S,G,onlyClosed,SkipShared, UseTriangulation);
}
gp_Pnt P = G.CentreOfMass();
@@ -313,6 +322,7 @@ Standard_Integer vpropsgk(Draw_Interpretor& di, Standard_Integer n, const char**
}
//=======================================================================
//function : GPropCommands
//purpose :
@@ -328,11 +338,11 @@ void BRepTest::GPropCommands(Draw_Interpretor& theCommands)
const char* g = "Global properties";
theCommands.Add("lprops",
"lprops name [x y z] [-skip] [-full] : compute linear properties",
"lprops name [x y z] [-skip] [-full] [-tri]: compute linear properties",
__FILE__, props, g);
theCommands.Add("sprops", "sprops name [epsilon] [x y z] [-skip] [-full] :\n"
theCommands.Add("sprops", "sprops name [epsilon] [x y z] [-skip] [-full] [-tri]:\n"
" compute surfacic properties", __FILE__, props, g);
theCommands.Add("vprops", "vprops name [epsilon] [c[losed]] [x y z] [-skip] [-full] :\n"
theCommands.Add("vprops", "vprops name [epsilon] [c[losed]] [x y z] [-skip] [-full] [-tri]:\n"
" compute volumic properties", __FILE__, props, g);
theCommands.Add("vpropsgk",