Vectors::Vectors(Mesh * m, TagRealArray t, ElementType etype) : m(m), etype(etype)
{
double cmin[3] = { 1.0e20, 1.0e20, 1.0e20};
double cmax[3] = {-1.0e20,-1.0e20,-1.0e20};
for(int k = 0; k < m->NodeLastLocalID(); ++k) if( m->isValidNode(k) )
{
Node n = m->NodeByLocalID(k);
for(int l = 0; l < 3; ++l)
{
if( cmin[l] > n->Coords()[l] ) cmin[l] = n->Coords()[l];
if( cmax[l] < n->Coords()[l] ) cmax[l] = n->Coords()[l];
}
}
double diag = 0;
for(int l = 0; l < 3; ++l)
diag += (cmax[l]-cmin[l])*(cmax[l]-cmin[l]);
diag = sqrt(diag); //estimate mesh size
max_length = 0;
for(int k = 0; k < m->LastLocalID(etype); ++k) if( m->isValidElement(etype,k) )
{
Element e = m->ElementByLocalID(etype,k);
if( e.HaveData(t) )
{
vec_t add;
e->Centroid(add.cnt.data());
add.eid = k;
for(int l = 0; l < std::min(t[e].size(),3u); ++l)
add.dir[l] = t[e][l];
double l = add.dir.length();
if( l > max_length ) max_length = l;
add.dir /= l;
add.length = l;
vecs.push_back(add);
}
}
scale = diag/100.0;
std::cout << "scale: " << scale << std::endl;
}
