int edge_normal
(const MVertex *const vertex, const int zoneIndex, const GEdge *const gEdge,
const CCon::FaceVector<MZoneBoundary<2>::GlobalVertexData<MEdge>::FaceDataB>
&faces, SVector3 &boNormal, const int onlyFace = -1)
{
double par=0.0;
// Note: const_cast used to match MVertex.cpp interface
if(!reparamMeshVertexOnEdge(const_cast<MVertex*>(vertex), gEdge, par)) return 1;
const SVector3 tangent(gEdge->firstDer(par));
// Tangent to the boundary face
SPoint3 interior(0., 0., 0.); // An interior point
SVector3 meshPlaneNormal(0.); // This normal is perpendicular to the
// plane of the mesh
// The interior point and mesh plane normal are computed from all elements in
// the zone.
int cFace = 0;
int iFace = 0;
int nFace = faces.size();
if ( onlyFace >= 0 ) {
iFace = onlyFace;
nFace = onlyFace + 1;
}
for(; iFace != nFace; ++iFace) {
if(faces[iFace].zoneIndex == zoneIndex) {
++cFace;
interior += faces[iFace].parentElement->barycenter();
// Make sure all the planes go in the same direction
//**Required?
SVector3 mpnt = faces[iFace].parentElement->getFace(0).normal();
if(dot(mpnt, meshPlaneNormal) < 0.) mpnt.negate();
meshPlaneNormal += mpnt;
}
}
interior /= cFace;
// Normal to the boundary edge (but unknown direction)
boNormal = crossprod(tangent, meshPlaneNormal);
boNormal.normalize();
// Direction vector from vertex to interior (inwards). The normal should
// point in the same direction.
if(dot(boNormal, SVector3(vertex->point(), interior)) < 0.)
boNormal.negate();
return 0;
}
void updateBoVec<3, MFace>(
const int normalSource, const MVertex *const vertex, const int zoneIndex,
const int vertIndex,
const CCon::FaceVector<MZoneBoundary<3>::GlobalVertexData<MFace>::FaceDataB>
&faces,
ZoneBoVec &zoneBoVec, BCPatchIndex &patch, bool &warnNormFromElem)
{
GEntity *ent;
if(normalSource == NormalSourceElement) goto getNormalFromElements;
ent = vertex->onWhat();
if(ent == 0) {
goto getNormalFromElements;
// No entity: try to find a normal from the faces
}
else {
switch(ent->dim()) {
case 0:
case 1:
/*--------------------------------------------------------------------*
* In this case, there are possibly multiple GFaces from this zone
* connected to the vertex. One patch for each GFace will be written.
*--------------------------------------------------------------------*/
{
//--Get a list of face entities connected to 'ent'
std::list<GFace *> gFaceList;
switch(ent->dim()) {
case 0: {
std::vector<GEdge *> gEdgeList = ent->edges();
std::list<GFace *> gFaceList;
for(std::vector<GEdge *>::const_iterator gEIt = gEdgeList.begin();
gEIt != gEdgeList.end(); ++gEIt) {
std::vector<GFace *> alist = (*gEIt)->faces();
gFaceList.insert(gFaceList.end(), alist.begin(), alist.end());
}
// Remove duplicates
gFaceList.sort();
gFaceList.unique();
} break;
case 1: {
std::vector<GFace *> fac = ent->faces();
gFaceList.insert(gFaceList.end(), fac.begin(), fac.end());
} break;
}
//--Get a list of face entities connected to the 'vertex' that are also
// in the
//--zone
std::list<const GFace *> useGFace;
std::vector<GEdge *> gEdgeList;
const int nFace = faces.size();
for(int iFace = 0; iFace != nFace; ++iFace) {
if(zoneIndex == faces[iFace].zoneIndex) {
bool matchedFace = false;
MFace mFace =
faces[iFace].parentElement->getFace(faces[iFace].parentFace);
const int nVOnF = mFace.getNumVertices();
int vertexOnF = 0; // The index of 'vertex' in the face
for(int iVOnF = 0; iVOnF != nVOnF; ++iVOnF) {
const MVertex *const vertex2 = mFace.getVertex(iVOnF);
if(vertex == vertex2)
vertexOnF = iVOnF;
else {
const GEntity *const ent2 = vertex2->onWhat();
if(ent2->dim() == 2) {
matchedFace = true;
useGFace.push_back(static_cast<const GFace *>(ent2));
break;
}
}
}
// Triangle MElements are a total P.I.T.A.:
// - If the original 'ent' is a vertex, one MVertex can be on the
// GVertex, and the other two on GEdges, and then the MElement is
// still on the GFace.
// - If the original 'ent' is an edge, one MVertex can be on the
// original GEdge, another on a GVertex, and the final on another
// GEdge, and then the MElement is still on the GFace. There is
// also the unlikely case where the two other MVertex are both on
// edges ... and the MElement is still on the GFace.
if(!matchedFace && (3 == nVOnF)) {
const MVertex *vertex2 = 0;
const MVertex *vertex3 = 0;
switch(vertexOnF) {
case 0:
vertex2 = mFace.getVertex(1);
vertex3 = mFace.getVertex(2);
break;
case 1:
vertex2 = mFace.getVertex(0);
vertex3 = mFace.getVertex(2);
break;
case 2:
vertex2 = mFace.getVertex(0);
vertex3 = mFace.getVertex(1);
break;
}
if(vertex2 && vertex3) {
const GEntity *const ent2 = vertex2->onWhat();
const GEntity *const ent3 = vertex3->onWhat();
if(ent2 && ent3) {
if(ent2->dim() == 1 && ent3->dim() == 1) {
// Which GFace is bounded by edges ent2 and ent3?
for(std::list<GFace *>::const_iterator gFIt =
gFaceList.begin();
gFIt != gFaceList.end(); ++gFIt) {
gEdgeList = (*gFIt)->edges();
if((std::find(gEdgeList.begin(), gEdgeList.end(), ent2) !=
gEdgeList.end()) &&
(std::find(gEdgeList.begin(), gEdgeList.end(), ent3) !=
gEdgeList.end())) {
// Edges ent2 and ent3 bound this face
useGFace.push_back(*gFIt);
break;
}
}
}
else if(ent->dim() == 1 && (ent2->dim() + ent3->dim() == 1)) {
const GEntity *entCmp;
if(ent2->dim() == 1)
entCmp = ent2;
else
entCmp = ent3;
// Which GFace is bounded by entCmp
for(std::list<GFace *>::const_iterator gFIt =
gFaceList.begin();
gFIt != gFaceList.end(); ++gFIt) {
gEdgeList = (*gFIt)->edges();
if(std::find(gEdgeList.begin(), gEdgeList.end(),
entCmp) != gEdgeList.end()) {
// Edge entCmp and the original edge bound this face
useGFace.push_back(*gFIt);
break;
}
}
}
}
}
} // Stupid triangles
} // End if face in zone
} // End loop over faces
// Duplicates are a possibility, remove
useGFace.sort();
useGFace.unique();
//--'useGFace' now contains the face entities that connect to vertex. A
// BC
//--patch will be written for each of them.
for(std::list<const GFace *>::const_iterator gFIt = useGFace.begin();
gFIt != useGFace.end(); ++gFIt) {
SPoint2 par;
if(!reparamMeshVertexOnFace(const_cast<MVertex *>(vertex), *gFIt,
par))
goto getNormalFromElements; // :P After all that!
SVector3 boNormal = (*gFIt)->normal(par);
SPoint3 interior(0., 0., 0.);
int cFace = 0;
const int nFace = faces.size();
for(int iFace = 0; iFace != nFace; ++iFace) {
if(faces[iFace].zoneIndex == zoneIndex) {
++cFace;
interior += faces[iFace].parentElement->barycenter();
}
}
interior /= cFace;
if(dot(boNormal, SVector3(vertex->point(), interior)) < 0.)
boNormal.negate();
zoneBoVec.push_back(
VertexBoundary(zoneIndex, (*gFIt)->tag(), boNormal,
const_cast<MVertex *>(vertex), vertIndex));
patch.add((*gFIt)->tag());
}
}
break;
case 2:
/*--------------------------------------------------------------------*
* The vertex exists on a face and belongs to only 1 BC patch.
*--------------------------------------------------------------------*/
{
const GFace *const gFace = static_cast<const GFace *>(ent);
SPoint2 par;
if(!reparamMeshVertexOnFace(const_cast<MVertex *>(vertex), gFace, par))
goto getNormalFromElements;
SVector3 boNormal = static_cast<const GFace *>(ent)->normal(par);
SPoint3 interior(0., 0., 0.);
int cFace = 0;
const int nFace = faces.size();
for(int iFace = 0; iFace != nFace; ++iFace) {
if(faces[iFace].zoneIndex == zoneIndex) {
++cFace;
interior += faces[iFace].parentElement->barycenter();
}
}
interior /= cFace;
if(dot(boNormal, SVector3(vertex->point(), interior)) < 0.)
boNormal.negate();
zoneBoVec.push_back(VertexBoundary(zoneIndex, gFace->tag(), boNormal,
const_cast<MVertex *>(vertex),
vertIndex));
patch.add(gFace->tag());
}
break;
default: goto getNormalFromElements;
}
}
return;
getNormalFromElements:;
/*--------------------------------------------------------------------*
* Geometry information cannot be used - generate normals from the
* elements
*--------------------------------------------------------------------*/
{
if(warnNormFromElem && normalSource == 1) {
Msg::Warning("Some or all boundary normals were determined from mesh "
"elements instead of from the geometry");
warnNormFromElem = false;
}
// Sum the normals from each element connected to the vertex and in the
// zone. Each normal has to be converted independently into an inwards-
// pointing normal.
//**Weight each normal by the area of the boundary element?
SVector3 boNormal(0.);
const int nFace = faces.size();
for(int iFace = 0; iFace != nFace; ++iFace) {
if(faces[iFace].zoneIndex == zoneIndex) {
// Normal to the boundary (unknown direction)
SVector3 bnt =
faces[iFace].parentElement->getFace(faces[iFace].parentFace).normal();
// Inwards normal
const SVector3 inwards(vertex->point(),
faces[iFace].parentElement->barycenter());
if(dot(bnt, inwards) < 0.) bnt.negate();
boNormal += bnt;
}
}
boNormal.normalize();
zoneBoVec.push_back(VertexBoundary(
zoneIndex, 0, boNormal, const_cast<MVertex *>(vertex), vertIndex));
patch.add(0);
}
}
void updateBoVec<2, MEdge>(
const int normalSource, const MVertex *const vertex, const int zoneIndex,
const int vertIndex,
const CCon::FaceVector<MZoneBoundary<2>::GlobalVertexData<MEdge>::FaceDataB>
&faces,
ZoneBoVec &zoneBoVec, BCPatchIndex &patch, bool &warnNormFromElem)
{
GEntity *ent;
if(normalSource == NormalSourceElement) goto getNormalFromElements;
ent = vertex->onWhat();
if(ent == 0) {
goto getNormalFromElements;
// No entity: try to find a normal from the faces
}
else {
switch(ent->dim()) {
case 0:
/*--------------------------------------------------------------------*
* In this case, there are possibly two GEdges from this zone
* connected to the vertex. If the angle between the two edges is
* significant, the BC patch will be split and this vertex will be
* written in both patches with different normals. If the angle is
* small, or only one GEdge belongs to this zone, then the vertex will
* only be written to one patch.
*--------------------------------------------------------------------*/
{
// Find edge entities that are connected to elements in the zone
std::vector<std::pair<GEdge *, int> > useGEdge;
const int nFace = faces.size();
for(int iFace = 0; iFace != nFace; ++iFace) {
if(zoneIndex == faces[iFace].zoneIndex) {
MEdge mEdge =
faces[iFace].parentElement->getEdge(faces[iFace].parentFace);
// Get the other vertex on the mesh edge.
MVertex *vertex2 = mEdge.getMinVertex();
if(vertex2 == vertex) vertex2 = mEdge.getMaxVertex();
// Check if the entity associated with vertex2 is a line and
// is also connected to vertex. If so, add it to the container of
// edge entities that will be used to determine the normal
GEntity *const ent2 = vertex2->onWhat();
if(ent2->dim() == 1) {
useGEdge.push_back(
std::pair<GEdge *, int>(static_cast<GEdge *>(ent2), iFace));
}
}
}
//--'useGEdge' now contains the edge entities that will be used to
// determine
//--the normals
switch(useGEdge.size()) {
case 0:
// goto getNormalFromElements;
// We probably don't want BC data if none of the faces attatched to
// this vertex and in this zone are on the boundary.
break;
case 1: {
const GEdge *const gEdge =
static_cast<const GEdge *>(useGEdge[0].first);
SVector3 boNormal;
if(edge_normal(vertex, zoneIndex, gEdge, faces, boNormal))
goto getNormalFromElements;
zoneBoVec.push_back(VertexBoundary(zoneIndex, gEdge->tag(), boNormal,
const_cast<MVertex *>(vertex),
vertIndex));
patch.add(gEdge->tag());
} break;
case 2: {
// Get the first normal
const GEdge *const gEdge1 =
static_cast<const GEdge *>(useGEdge[0].first);
SVector3 boNormal1;
if(edge_normal(vertex, zoneIndex, gEdge1, faces, boNormal1,
useGEdge[0].second))
goto getNormalFromElements;
// Get the second normal
const GEdge *const gEdge2 =
static_cast<const GEdge *>(useGEdge[1].first);
SVector3 boNormal2;
if(edge_normal(vertex, zoneIndex, gEdge2, faces, boNormal2,
useGEdge[1].second))
goto getNormalFromElements;
if(dot(boNormal1, boNormal2) < 0.98) {
//--Write 2 separate patches
zoneBoVec.push_back(
VertexBoundary(zoneIndex, gEdge1->tag(), boNormal1,
const_cast<MVertex *>(vertex), vertIndex));
patch.add(gEdge1->tag());
zoneBoVec.push_back(
VertexBoundary(zoneIndex, gEdge2->tag(), boNormal2,
const_cast<MVertex *>(vertex), vertIndex));
patch.add(gEdge2->tag());
}
else {
//--Write one patch
boNormal1 += boNormal2;
boNormal1 *= 0.5;
zoneBoVec.push_back(
VertexBoundary(zoneIndex, gEdge1->tag(), boNormal1,
const_cast<MVertex *>(vertex), vertIndex));
patch.addPair(gEdge1->tag(), gEdge2->tag());
}
} break;
default:
Msg::Error("Internal error based on 2-D boundary assumptions (file "
"\'MZoneBoundary.cpp'). Boundary vertices may be "
"incorrect");
break;
}
}
break;
case 1:
/*--------------------------------------------------------------------*
* The vertex exists on an edge and belongs to only 1 BC patch.
*--------------------------------------------------------------------*/
{
SVector3 boNormal;
if(edge_normal(vertex, zoneIndex, static_cast<const GEdge *>(ent),
faces, boNormal))
goto getNormalFromElements;
zoneBoVec.push_back(VertexBoundary(zoneIndex, ent->tag(), boNormal,
const_cast<MVertex *>(vertex),
vertIndex));
patch.add(ent->tag());
}
break;
default: goto getNormalFromElements;
}
}
return;
getNormalFromElements:;
/*--------------------------------------------------------------------*
* Geometry information cannot be used - generate normals from the
* elements
*--------------------------------------------------------------------*/
{
if(warnNormFromElem && normalSource == 1) {
Msg::Warning("Some or all boundary normals were determined from mesh "
"elements instead of from the geometry");
warnNormFromElem = false;
}
// The mesh plane normal is computed from all elements attached to the
// vertex
SVector3 meshPlaneNormal(0.); // This normal is perpendicular to the
// plane of the mesh
const int nFace = faces.size();
for(int iFace = 0; iFace != nFace; ++iFace) {
if(faces[iFace].zoneIndex == zoneIndex) {
// Make sure all the planes go in the same direction
//**Required?
SVector3 mpnt = faces[iFace].parentElement->getFace(0).normal();
if(dot(mpnt, meshPlaneNormal) < 0.) mpnt.negate();
meshPlaneNormal += mpnt;
}
}
// Sum the normals from each element. The tangent is computed from all
// faces in the zone attached to the vertex and is weighted by the length of
// the edge. Each tangent has to be converted independently into an
// inwards-pointing normal.
SVector3 boNormal(0.);
for(int iFace = 0; iFace != nFace; ++iFace) {
if(faces[iFace].zoneIndex == zoneIndex) {
const SVector3 tangent =
faces[iFace]
.parentElement->getEdge(faces[iFace].parentFace)
.tangent();
// Normal to the boundary (unknown direction)
SVector3 bnt = crossprod(tangent, meshPlaneNormal);
// Inwards normal
const SVector3 inwards(vertex->point(),
faces[iFace].parentElement->barycenter());
if(dot(bnt, inwards) < 0.) bnt.negate();
boNormal += bnt;
}
}
boNormal.normalize();
zoneBoVec.push_back(VertexBoundary(
zoneIndex, 0, boNormal, const_cast<MVertex *>(vertex), vertIndex));
patch.add(0);
}
}