Quickest way to check if two shapes intersect?

Did you figure it out? I am having some problems using BRepAlgoAPI_Common and BRepAlgoAPI_Section. I would be really grateful if you can help me out.

Hello,

you can try the Voxel package.

I've been testing it (although not very intensively) for some weeks now. It looks very interesting although I have already spotted some problems. However, I think this is suitable for telling if two shapes intersect (with respect to the specified tolerance).

Pawel

this might work:

bool isintersecting(TopoDS_Shape shape1,TopoDS_Shape shape2, double detail)
{
if (!(detail > 0)) detail = 0.1;

BRepExtrema_DistShapeShape dst (shap1, shape2,detail);
if (dst.IsDone())
{

gp_Pnt P1, P2;
for (int i = 1; i <= dst.NbSolution(); i++)
{
P1 = dst.PointOnShape1(i);
P2 = dst.PointOnShape2(i);
Standard_Real Dist = P1.Distance(P2);
if ( Dist <= Precision::Confusion()+0.1 )
{
return true;
}
}
}

return false;

}

This works as long as the shape only has one face in it, if there are more than one faces

bool isintersecting(TopoDS_Shape srf1,TopoDS_Shape srf2)
{

qDebug() << "precision" << Precision::Intersection();
srf1 = HSF::getfacefromshape(srf1);
srf2 = HSF::getfacefromshape(srf2);
Handle(Geom_Surface) S1 = BRep_Tool::Surface(TopoDS::Face(srf1));
Handle(Geom_Surface) S2 = BRep_Tool::Surface(TopoDS::Face(srf2));
//double precision = Precision::Confusion();
double precision = 0.1;
qDebug() << "before intersect";
GeomAPI_IntSS Intersector(S1, S2, precision);
qDebug() << "after intersect";
if (Intersector. NbLines() > 0) { return true; } else { return false;}

}

TopoDS_Shape getfacefromshape(TopoDS_Shape shape1)
{
TopoDS_Shape myshape;//=shape1 ;
TopExp_Explorer Ex;
for (Ex.Init(shape1,TopAbs_FACE); Ex.More(); Ex.Next())
{
myshape = Ex.Current();
}
return myshape;
}