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special algorithms in findpoints for degenerated cylinder/plane

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This commit is contained in:
Joachim Schoeberl 2014-12-07 09:28:39 +00:00
parent fab4f836d1
commit 2350e8b9d5
5 changed files with 164 additions and 11 deletions
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7
libsrc/csg/algprim.hpp
View File

@ -63,7 +63,8 @@ namespace netgen
public:
///
Plane (const Point<3> & ap, Vec<3> an);
Point<3> P() const { return p; }
Vec<3> N() const { return n; }
virtual void GetPrimitiveData (const char *& classname,
Array<double> & coeffs) const;
virtual void SetPrimitiveData (Array<double> & coeffs);
@ -186,7 +187,9 @@ namespace netgen
public:
Cylinder (const Point<3> & aa, const Point<3> & ab, double ar);
Cylinder (Array<double> & coeffs);
Point<3> A() const { return a; }
Point<3> B() const { return b; }
double R() const { return r; }
virtual void GetPrimitiveData (const char *& classname, Array<double> & coeffs) const;
virtual void SetPrimitiveData (Array<double> & coeffs);
static Primitive * CreateDefault ();

36
libsrc/csg/python_csg.cpp
View File

@ -111,9 +111,9 @@ public:
void SetColor(double ared, double agreen, double ablue)
{
red = ared;
green = agreen;
blue = ablue;
red = ared;
green = agreen;
blue = ablue;
}
double GetRed() const { return red; }
@ -285,6 +285,27 @@ void ExportCSG()
self.GetTopLevelObject(tlonr)->SetTransparent(solid->IsTransparent());
}))
.def("CloseSurfaces", FunctionPointer
([] (CSGeometry & self, shared_ptr<SPSolid> s1, shared_ptr<SPSolid> s2, int reflevels)
{
Array<int> si1, si2;
s1->GetSolid()->GetSurfaceIndices (si1);
s2->GetSolid()->GetSurfaceIndices (si2);
cout << "surface ids1 = " << si1 << endl;
cout << "surface ids2 = " << si2 << endl;
Flags flags;
const TopLevelObject * domain = nullptr;
self.AddIdentification
(new CloseSurfaceIdentification
(self.GetNIdentifications()+1, self,
self.GetSurface (si1[0]), self.GetSurface (si2[0]),
domain,
flags));
}),
(bp::arg("self"), bp::arg("solid1"), bp::arg("solid2"), bp::arg("reflevels")=2)
)
.add_property ("ntlo", &CSGeometry::GetNTopLevelObjects)
;
@ -300,7 +321,14 @@ void ExportCSG()
return dummy;
}))
;
bp::def("ZRefinement", FunctionPointer
([](Mesh & mesh, CSGeometry & geom)
{
ZRefinementOptions opt;
opt.minref = 5;
ZRefinement (mesh, &geom, opt);
}))
;
}

112
libsrc/csg/solid.cpp
View File

@ -1231,6 +1231,88 @@ namespace netgen
Solid * Solid :: RecGetReducedSolid (const BoxSphere<3> & box, INSOLID_TYPE & in) const
{
{
// checking special case for degenerated plane - cylinder, Dec 2014
int cnt_plane = 0, cnt_cyl = 0;
bool inv_plane, inv_cyl;
Plane * plane;
Cylinder * cyl;
ForEachSurface ( [&] (Surface * surf, bool inv)
{
if (dynamic_cast<Plane*>(surf))
{
cnt_plane++;
plane = dynamic_cast<Plane*>(surf);
inv_plane = inv;
}
if (dynamic_cast<Cylinder*>(surf))
{
cnt_cyl++;
cyl = dynamic_cast<Cylinder*>(surf);
inv_cyl = inv;
}
});
if (cnt_plane == 1 && cnt_cyl == 1)
{
double scala = (cyl->A()-plane->P()) * plane->N();
double scalb = (cyl->B()-plane->P()) * plane->N();
double scal = plane->N() * plane->N();
if ( ( fabs (scala*scala - cyl->R()*cyl->R()*scal) < 1e-10*cyl->R()*cyl->R() ) &&
( fabs (scalb*scalb - cyl->R()*cyl->R()*scal) < 1e-10*cyl->R()*cyl->R() ) )
{
// intersection edge in box ?
Point<3> p0 = cyl->A() - (scala/scal) * plane->N();
Vec<3> vedge = cyl->B() - cyl->A();
Vec<3> ve_center = box.Center()-p0;
// dist(lam) = \| ve_center \|^2 - 2 lam (vedge, ve_center) + lam^2 \| vedge \|^2
double num = vedge*ve_center;
double den = vedge*vedge;
double dist_edge_center2 = ve_center*ve_center - num * num /den;
bool edge_in_box = dist_edge_center2 < sqr (box.Diam());
if (!edge_in_box)
{
if (op == SECTION)
{
// cout << "solid = " << *this << endl;
if (!inv_cyl && !inv_plane && scala < 0)
{
cout << "fix for degenerated cyl-plane edge: just the cylinder" << endl;
Solid * sol = new Solid (cyl);
sol -> op = TERM_REF;
return sol;
}
}
if (op == UNION)
{
// cout << "solid = " << *this << ", inv_plane = " << inv_plane << " inv_cyl = " << inv_cyl << " scalb " << scalb << endl;
if (!inv_plane && !inv_cyl && (scala < 0))
{
cout << "fix for degenerated cyl-plane edge: just the plane" << endl;
// return new Solid (plane);
Solid * sol = new Solid (plane);
sol -> op = TERM_REF;
return sol;
}
}
; // *testout << "have 1 plane and 1 cyl, degenerated" << endl;
}
}
}
}
Solid * redsol = NULL;
switch (op)
@ -1417,6 +1499,36 @@ namespace netgen
}
}
void Solid :: ForEachSurface (const std::function<void(Surface*,bool)> & lambda, bool inv) const
{
switch (op)
{
case TERM: case TERM_REF:
{
for (int j = 0; j < prim->GetNSurfaces(); j++)
if (prim->SurfaceActive (j))
lambda (&prim->GetSurface(j), inv);
break;
}
case UNION:
case SECTION:
{
s1 -> ForEachSurface (lambda, inv);
s2 -> ForEachSurface (lambda, inv);
break;
}
case SUB:
{
s1 -> ForEachSurface (lambda, !inv);
break;
}
case ROOT:
{
s1 -> ForEachSurface (lambda, inv);
break;
}
}
}
void Solid :: GetTangentialSurfaceIndices (const Point<3> & p, Array<int> & surfind, double eps) const

1
libsrc/csg/solid.hpp
View File

@ -73,6 +73,7 @@ namespace netgen
void GetTangentialSurfaceIndices2 (const Point<3> & p, const Vec<3> & v, Array<int> & surfids, double eps) const;
void GetTangentialSurfaceIndices3 (const Point<3> & p, const Vec<3> & v, const Vec<3> & v2, Array<int> & surfids, double eps) const;
void ForEachSurface (const std::function<void(Surface*,bool)> & lambda, bool inv = false) const;
Primitive * GetPrimitive ()
{ return (op == TERM || op == TERM_REF) ? prim : NULL; }

19
libsrc/csg/specpoin.cpp
View File

@ -199,15 +199,22 @@ namespace netgen
throw NgException (err.c_str());
}
if (level == 40 || level == 41 || level == 45)
{
*testout << "level = " << level << " cp = " << calccp << " ep = " << calcep << ", box = " << box << ", solid = " << *sol << endl;
}
bool decision;
bool possiblecrossp, possibleexp; // possible cross or extremalpoint
bool surecrossp = 0, sureexp = 0; // sure ...
static Array<int> locsurf; // attention: array is static
// static Array<int> locsurf; // attention: array is static
ArrayMem<int,100> locsurf;
static int cntbox = 0;
cntbox++;
// static int cntbox = 0;
// cntbox++;
if (level <= boxesinlevel.Size())
boxesinlevel.Elem(level)++;
@ -619,8 +626,10 @@ namespace netgen
Point<3> pp;
if (IsEdgeExtremalPoint (surf1, surf2, p, pp, box.Diam()/2))
{
(*testout) << "extremalpoint (nearly) found:" << pp << endl;
(*testout) << "extremalpoint (nearly) found:" << pp
<< "box.diam = " << box.Diam() << ", dist = " << Dist(pp,box.Center())
<< endl;
if (Dist (pp, box.Center()) < box.Diam()/2 &&
sol -> IsIn (pp, 1e-6*size) && !sol->IsStrictIn (pp, 1e-6*size) )
{