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switch OCC meshing to physical space, and optimize FromPlane projection using uv-geominfo

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This commit is contained in:
Joachim Schöberl 2019-10-07 23:45:13 +02:00
parent 86342534c1
commit 62e3e790d8
3 changed files with 75 additions and 9 deletions
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1
libsrc/meshing/meshing2.cpp
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@ -853,6 +853,7 @@ namespace netgen
for (int i = oldnp+1; i <= plainpoints.Size(); i++)
{
Point<3> locp;
upgeominfo.Elem(i) = *blgeominfo1;
int err =
TransformFromPlain (plainpoints.Elem(i), locp,
upgeominfo.Elem(i), h);

2
libsrc/occ/occgenmesh.cpp
View File

@ -647,7 +647,7 @@ namespace netgen
Box<3> bb = geom.GetBoundingBox();
// int projecttype = PLANESPACE;
int projecttype = PLANESPACE;
static Timer tinit("init");
tinit.Start();

81
libsrc/occ/occmeshsurf.cpp
View File

@ -342,7 +342,9 @@ namespace netgen
Point<3> & p3d,
PointGeomInfo & gi,
double h)
{
{
static Timer t("FromPlane"); RegionTimer reg(t);
if (projecttype == PLANESPACE)
{
// cout << "2d : " << pplane << endl;
@ -366,12 +368,75 @@ namespace netgen
void OCCSurface :: Project (Point<3> & p, PointGeomInfo & gi)
void OCCSurface :: Project (Point<3> & ap, PointGeomInfo & gi)
{
static Timer t("OccSurface::Project"); RegionTimer reg(t);
// try Newton's method ...
gp_Pnt p(ap(0), ap(1), ap(2));
double u = gi.u;
double v = gi.v;
gp_Pnt x = occface->Value (u,v);
if (p.SquareDistance(x) <= sqr(PROJECTION_TOLERANCE)) return;
gp_Vec du, dv;
occface->D1(u,v,x,du,dv);
int count = 0;
gp_Pnt xold;
gp_Vec n;
double det, lambda, mu;
do
{
count++;
n = du^dv;
det = Det3 (n.X(), du.X(), dv.X(),
n.Y(), du.Y(), dv.Y(),
n.Z(), du.Z(), dv.Z());
if (det < 1e-15)
break;
lambda = Det3 (n.X(), p.X()-x.X(), dv.X(),
n.Y(), p.Y()-x.Y(), dv.Y(),
n.Z(), p.Z()-x.Z(), dv.Z())/det;
mu = Det3 (n.X(), du.X(), p.X()-x.X(),
n.Y(), du.Y(), p.Y()-x.Y(),
n.Z(), du.Z(), p.Z()-x.Z())/det;
u += lambda;
v += mu;
xold = x;
occface->D1(u,v,x,du,dv);
if (xold.SquareDistance(x) < sqr(PROJECTION_TOLERANCE))
{
ap = Point<3> (x.X(), x.Y(), x.Z());
gi.u = u;
gi.v = v;
return;
}
}
while (count < 20);
// Newton did not converge, use OCC projection
// static int cnt = 0;
// if (cnt++ % 1000 == 0) cout << "********************************************** OCCSurfce :: Project, cnt = " << cnt << endl;
gp_Pnt pnt(p(0), p(1), p(2));
gp_Pnt pnt = p; // (p(0), p(1), p(2));
//(*testout) << "pnt = " << pnt.X() << ", " << pnt.Y() << ", " << pnt.Z() << endl;
@ -406,20 +471,20 @@ namespace netgen
proj.LowerDistanceParameters (gi.u, gi.v);
*/
double u,v;
// double u,v;
Handle( ShapeAnalysis_Surface ) su = new ShapeAnalysis_Surface( occface );
gp_Pnt2d suval = su->ValueOfUV ( pnt, BRep_Tool::Tolerance( topods_face ) );
auto toltool = BRep_Tool::Tolerance( topods_face );
gp_Pnt2d suval = su->ValueOfUV ( pnt, toltool);
suval.Coord( u, v);
pnt = occface->Value( u, v );
//(*testout) << "pnt(proj) = " << pnt.X() << ", " << pnt.Y() << ", " << pnt.Z() << endl;
gi.u = u;
gi.v = v;
gi.trignum = 1;
p = Point<3> (pnt.X(), pnt.Y(), pnt.Z());
ap = Point<3> (pnt.X(), pnt.Y(), pnt.Z());
}