/** @return the nearest of equidistant middle points of the line. */
RS_Vector RS_Line::getNearestMiddle(const RS_Vector& coord,
double* dist,
int middlePoints
)const
{
// RS_DEBUG->print("RS_Line::getNearestMiddle(): begin\n");
RS_Vector dvp(getEndpoint() - getStartpoint());
double l=dvp.magnitude();
if( l<= RS_TOLERANCE) {
//line too short
return const_cast<RS_Line*>(this)->getNearestCenter(coord, dist); /* ?????? */
}
RS_Vector vp0(getNearestPointOnEntity(coord,true,dist));
int counts=middlePoints+1;
int i( static_cast<int>(vp0.distanceTo(getStartpoint())/l*counts+0.5));
if(!i) i++; // remove end points
if(i==counts) i--;
vp0=getStartpoint() + dvp*(double(i)/double(counts));
if(dist != NULL) {
*dist=vp0.distanceTo(coord);
}
//std::cout << "rs_line.cpp Dist " << *dist << "\n";
// RS_DEBUG->print("RS_Line::getNearestMiddle(): end\n");
return vp0;
}
/** @return the nearest of equidistant middle points of the line. */
RS_Vector RS_Line::getNearestMiddle(const RS_Vector& coord,
double* dist,
int middlePoints
) {
RS_DEBUG->print("RS_Line::getNearestMiddle(): begin\n");
RS_Vector dvp(getEndpoint() - getStartpoint());
double l=dvp.magnitude();
if( l<= RS_TOLERANCE) {
//line too short
RS_Vector vp(getStartpoint() + dvp*0.5);
if (dist != NULL) {
*dist=vp.distanceTo(coord);
}
return vp;
}
RS_Vector vp0(getNearestPointOnEntity(coord,true,dist));
int counts=middlePoints+1;
int i( static_cast<int>(vp0.distanceTo(getStartpoint())/l*counts+0.5));
if(!i) i++; // remove end points
if(i==counts) i--;
vp0=getStartpoint() + dvp*(double(i)/double(counts));
if(dist != NULL) {
*dist=vp0.distanceTo(coord);
}
RS_DEBUG->print("RS_Line::getNearestMiddle(): end\n");
return vp0;
}
void RS_Image::mirror(const RS_Vector& axisPoint1, const RS_Vector& axisPoint2) {
data.insertionPoint.mirror(axisPoint1, axisPoint2);
RS_Vector vp0(0.,0.);
RS_Vector vp1( axisPoint2-axisPoint1 );
data.uVector.mirror(vp0,vp1);
data.vVector.mirror(vp0,vp1);
calculateBorders();
}
RS_Vector RS_Circle::getNearestOrthTan(const RS_Vector& coord,
const RS_Line& normal,
bool /*onEntity = false*/)
{
if ( !coord.valid) {
return RS_Vector(false);
}
RS_Vector vp0(coord-getCenter());
RS_Vector vp1(normal.getAngle1());
double d=RS_Vector::dotP(vp0,vp1);
if(d >= 0. ) {
return getCenter() + vp1*getRadius();
}else{
return getCenter() - vp1*getRadius();
}
}
/**
* finds out which angles this dimension actually measures.
*
* @param ang1 Reference will return the start angle
* @param ang2 Reference will return the end angle
* @param reversed Reference will return the reversed flag.
*
* @return true: on success
*/
bool RS_DimAngular::getAngles(double& ang1, double& ang2, bool& reversed,
RS_Vector& p1, RS_Vector& p2) {
RS_Vector vp0(edata.definitionPoint4 - getCenter());
RS_Vector vp1(edata.definitionPoint2 - edata.definitionPoint1);
RS_Vector vp2(data.definitionPoint - edata.definitionPoint3);
// project p0 to the basis of p1 and p2
// p0 = a1 p1 + a2 p2
// <p0.p1>= a1 |p1|^2 + a2 <p1.p2>
// <p0,p2>= a1 <p1.p2> + a2 |p2|^2
// a1 = ( |p2|^2 <p0.p1> - <p1.p2><p0.p2>) /( |p1|^2 |p2|^2 - <p1.p2>^2)
// a2 = ( |p1|^2 <p0.p2> - <p1.p2><p0.p1>) /( |p1|^2 |p2|^2 - <p1.p2>^2)
double rp1=vp1.squared();
double rp2=vp2.squared();
double p0p1=RS_Vector::dotP(vp0,vp1);
double p0p2=RS_Vector::dotP(vp0,vp2);
double p1p2=RS_Vector::dotP(vp1,vp2);
double d= rp1*rp2 - p1p2*p1p2;
double a1=d*(rp2*p0p1-p1p2*p0p2); // we only need the sign, so, use multiply instead of division to avoid divid by zero;
if ( a1 >= 0. ) {
p1 = edata.definitionPoint2;
} else {
vp1 *= -1;
p1 = edata.definitionPoint1;
}
a1 = d*(rp1*p0p2-p1p2*p0p1);
if ( a1 >= 0. ) {
p2 = data.definitionPoint;
} else {
vp2 *= -1;
p2 = edata.definitionPoint3;
}
RS_Vector center = getCenter();
double ang = center.angleTo(edata.definitionPoint4);
ang1=vp1.angle();
ang2=vp2.angle();
if ( ! RS_Math::isAngleBetween(ang, ang1,ang2,false) ) {
reversed = true;
}
return true;
}
/**
*create circle inscribled in a triangle
*
*Author: Dongxu Li
*/
bool RS_Circle::createInscribe(const RS_Vector& coord, const std::vector<RS_Line*>& lines){
if(lines.size()<3) return false;
std::vector<RS_Line*> tri(lines);
RS_VectorSolutions sol=RS_Information::getIntersectionLineLine(tri[0],tri[1]);
if(sol.getNumber() == 0 ) {//move parallel to opposite
std::swap(tri[1],tri[2]);
sol=RS_Information::getIntersectionLineLine(tri[0],tri[1]);
}
if(sol.getNumber() == 0 ) return false;
RS_Vector vp0(sol.get(0));
sol=RS_Information::getIntersectionLineLine(tri[2],tri[1]);
if(sol.getNumber() == 0 ) return false;
RS_Vector vp1(sol.get(0));
RS_Vector dvp(vp1-vp0);
double a(dvp.squared());
if( a< RS_TOLERANCE2) return false; //three lines share a common intersecting point
RS_Vector vp(coord - vp0);
vp -= dvp*(RS_Vector::dotP(dvp,vp)/a); //normal component
RS_Vector vl0(tri[0]->getEndpoint() - tri[0]->getStartpoint());
a=dvp.angle();
double angle0(0.5*(vl0.angle() + a));
if( RS_Vector::dotP(vp,vl0) <0.) {
angle0 += 0.5*M_PI;
}
RS_Line line0(vp0, vp0+RS_Vector(angle0));//first bisecting line
vl0=(tri[2]->getEndpoint() - tri[2]->getStartpoint());
angle0=0.5*(vl0.angle() + a+M_PI);
if( RS_Vector::dotP(vp,vl0) <0.) {
angle0 += 0.5*M_PI;
}
RS_Line line1(vp1, vp1+RS_Vector(angle0));//second bisection line
sol=RS_Information::getIntersectionLineLine(&line0,&line1);
if(sol.getNumber() == 0 ) return false;
bool ret=createFromCR(sol.get(0),tri[1]->getDistanceToPoint(sol.get(0)));
if(!ret) return false;
for(auto p: lines){
if(! p->isTangent(data)) return false;
}
return true;
}
/**
* Draws the meta grid.
*
* @see drawIt()
*/
void RS_GraphicView::drawMetaGrid(RS_Painter *painter) {
if (!(grid && isGridOn()) /*|| grid->getMetaSpacing()<0.0*/) {
return;
}
//draw grid after metaGrid to avoid overwriting grid points by metaGrid lines
//bug# 3430258
grid->updatePointArray();
RS_Pen pen(metaGridColor,
RS2::Width00,
RS2::DotLine);
painter->setPen(pen);
RS_Vector dv=grid->getMetaGridWidth().scale(factor);
double dx=fabs(dv.x);
double dy=fabs(dv.y); //potential bug, need to recover metaGrid.width
// draw meta grid:
auto mx = grid->getMetaX();
for(auto const& x: mx){
painter->drawLine(RS_Vector(toGuiX(x), 0),
RS_Vector(toGuiX(x), getHeight()));
if(grid->isIsometric()){
painter->drawLine(RS_Vector(toGuiX(x)+0.5*dx, 0),
RS_Vector(toGuiX(x)+0.5*dx, getHeight()));
}
}
auto my = grid->getMetaY();
if(grid->isIsometric()){//isometric metaGrid
dx=fabs(dx);
dy=fabs(dy);
if(!my.size()|| dx<1||dy<1) return;
RS_Vector baseMeta(toGui(RS_Vector(mx[0],my[0])));
// x-x0=k*dx, x-remainder(x-x0,dx)
RS_Vector vp0(-remainder(-baseMeta.x,dx)-dx,getHeight()-remainder(getHeight()-baseMeta.y,dy)+dy);
RS_Vector vp1(vp0);
RS_Vector vp2(getWidth()-remainder(getWidth()-baseMeta.x,dx)+dx,vp0.y);
RS_Vector vp3(vp2);
int cmx = round((vp2.x - vp0.x)/dx);
int cmy = round((vp0.y +remainder(-baseMeta.y,dy)+dy)/dy);
for(int i=cmx+cmy+2;i>=0;i--){
if ( i <= cmx ) {
vp0.x += dx;
vp2.y -= dy;
}else{
vp0.y -= dy;
vp2.x -= dx;
}
if ( i <= cmy ) {
vp1.y -= dy;
vp3.x -= dx;
}else{
vp1.x += dx;
vp3.y -= dy;
}
painter->drawLine(vp0,vp1);
painter->drawLine(vp2,vp3);
}
}else{//orthogonal
for(auto const& y: my){
painter->drawLine(RS_Vector(0, toGuiY(y)),
RS_Vector(getWidth(), toGuiY(y)));
}
}
}
bool fill_hole(std::vector<std::size_t> const & hole, UniGraph const & graph,
mve::TriangleMesh::ConstPtr mesh, mve::MeshInfo const & mesh_info,
std::vector<std::vector<VertexProjectionInfo> > * vertex_projection_infos,
std::vector<TexturePatch::Ptr> * texture_patches) {
mve::TriangleMesh::FaceList const & mesh_faces = mesh->get_faces();
mve::TriangleMesh::VertexList const & vertices = mesh->get_vertices();
std::map<std::size_t, std::set<std::size_t> > tmp;
for (std::size_t const face_id : hole) {
std::size_t const v0 = mesh_faces[face_id * 3];
std::size_t const v1 = mesh_faces[face_id * 3 + 1];
std::size_t const v2 = mesh_faces[face_id * 3 + 2];
tmp[v0].insert(face_id);
tmp[v1].insert(face_id);
tmp[v2].insert(face_id);
}
std::size_t const num_vertices = tmp.size();
/* Only fill small holes. */
if (num_vertices > MAX_HOLE_NUM_FACES) return false;
/* Calculate 2D parameterization using the technique from libremesh/patch2d,
* which was published as sourcecode accompanying the following paper:
*
* Isotropic Surface Remeshing
* Simon Fuhrmann, Jens Ackermann, Thomas Kalbe, Michael Goesele
*/
std::size_t seed = -1;
std::vector<bool> is_border(num_vertices, false);
std::vector<std::vector<std::size_t> > adj_verts_via_border(num_vertices);
/* Index structures to map from local <-> global vertex id. */
std::map<std::size_t, std::size_t> g2l;
std::vector<std::size_t> l2g(num_vertices);
/* Index structure to determine column in matrix/vector. */
std::vector<std::size_t> idx(num_vertices);
std::size_t num_border_vertices = 0;
bool disk_topology = true;
std::map<std::size_t, std::set<std::size_t> >::iterator it = tmp.begin();
for (std::size_t j = 0; j < num_vertices; ++j, ++it) {
std::size_t vertex_id = it->first;
g2l[vertex_id] = j;
l2g[j] = vertex_id;
/* Check topology in original mesh. */
if (mesh_info[vertex_id].vclass != mve::MeshInfo::VERTEX_CLASS_SIMPLE) {
/* Complex/Border vertex in original mesh */
disk_topology = false;
break;
}
/* Check new topology and determine if vertex is now at the border. */
std::vector<std::size_t> const & adj_faces = mesh_info[vertex_id].faces;
std::set<std::size_t> const & adj_hole_faces = it->second;
std::vector<std::pair<std::size_t, std::size_t> > fan;
for (std::size_t k = 0; k < adj_faces.size(); ++k) {
std::size_t adj_face = adj_faces[k];
if (graph.get_label(adj_faces[k]) == 0 &&
adj_hole_faces.find(adj_face) != adj_hole_faces.end()) {
std::size_t curr = adj_faces[k];
std::size_t next = adj_faces[(k + 1) % adj_faces.size()];
std::pair<std::size_t, std::size_t> pair(curr, next);
fan.push_back(pair);
}
}
std::size_t gaps = 0;
for (std::size_t k = 0; k < fan.size(); k++) {
std::size_t curr = fan[k].first;
std::size_t next = fan[(k + 1) % fan.size()].first;
if (fan[k].second != next) {
++gaps;
for (std::size_t l = 0; l < 3; ++l) {
if(mesh_faces[curr * 3 + l] == vertex_id) {
std::size_t second = mesh_faces[curr * 3 + (l + 2) % 3];
adj_verts_via_border[j].push_back(second);
}
if(mesh_faces[next * 3 + l] == vertex_id) {
std::size_t first = mesh_faces[next * 3 + (l + 1) % 3];
adj_verts_via_border[j].push_back(first);
}
}
}
}
is_border[j] = gaps == 1;
/* Check if vertex is now complex. */
if (gaps > 1) {
/* Complex vertex in hole */
disk_topology = false;
break;
}
if (is_border[j]) {
idx[j] = num_border_vertices++;
seed = vertex_id;
} else {
idx[j] = j - num_border_vertices;
}
}
tmp.clear();
/* No disk or genus zero topology */
if (!disk_topology || num_border_vertices == 0) return false;
std::vector<std::size_t> border; border.reserve(num_border_vertices);
std::size_t prev = seed;
std::size_t curr = seed;
while (prev == seed || curr != seed) {
std::size_t next = std::numeric_limits<std::size_t>::max();
std::vector<std::size_t> const & adj_verts = adj_verts_via_border[g2l[curr]];
for (std::size_t adj_vert : adj_verts) {
assert(is_border[g2l[adj_vert]]);
if (adj_vert != prev && adj_vert != curr) {
next = adj_vert;
break;
}
}
if (next != std::numeric_limits<std::size_t>::max()) {
prev = curr;
curr = next;
border.push_back(next);
} else {
/* No new border vertex */
border.clear();
break;
}
/* Loop within border */
if (border.size() > num_border_vertices) break;
}
if (border.size() != num_border_vertices) return false;
float total_length = 0.0f;
float total_projection_length = 0.0f;
for (std::size_t j = 0; j < border.size(); ++j) {
std::size_t vi0 = border[j];
std::size_t vi1 = border[(j + 1) % border.size()];
std::vector<VertexProjectionInfo> const & vpi0 = vertex_projection_infos->at(vi0);
std::vector<VertexProjectionInfo> const & vpi1 = vertex_projection_infos->at(vi0);
/* According to the previous checks (vertex class within the origial
* mesh and boundary) there already has to be at least one projection
* of each border vertex. */
assert(!vpi0.empty() && !vpi1.empty());
math::Vec2f vp0(0.0f), vp1(0.0f);
for (VertexProjectionInfo const & info0 : vpi0) {
for (VertexProjectionInfo const & info1 : vpi1) {
if (info0.texture_patch_id == info1.texture_patch_id) {
vp0 = info0.projection;
vp1 = info1.projection;
break;
}
}
}
total_projection_length += (vp0 - vp1).norm();
math::Vec3f const & v0 = vertices[vi0];
math::Vec3f const & v1 = vertices[vi1];
total_length += (v0 - v1).norm();
}
float radius = total_projection_length / (2.0f * MATH_PI);
if (total_length < std::numeric_limits<float>::epsilon()) return false;
float length = 0.0f;
std::vector<math::Vec2f> projections(num_vertices);
for (std::size_t j = 0; j < border.size(); ++j) {
float angle = 2.0f * MATH_PI * (length / total_length);
projections[g2l[border[j]]] = math::Vec2f(std::cos(angle), std::sin(angle));
math::Vec3f const & v0 = vertices[border[j]];
math::Vec3f const & v1 = vertices[border[(j + 1) % border.size()]];
length += (v0 - v1).norm();
}
typedef Eigen::Triplet<float, int> Triplet;
std::vector<Triplet> coeff;
std::size_t matrix_size = num_vertices - border.size();
Eigen::VectorXf xx(matrix_size), xy(matrix_size);
if (matrix_size != 0) {
Eigen::VectorXf bx(matrix_size);
Eigen::VectorXf by(matrix_size);
for (std::size_t j = 0; j < num_vertices; ++j) {
if (is_border[j]) continue;
std::size_t const vertex_id = l2g[j];
/* Calculate "Mean Value Coordinates" as proposed by Michael S. Floater */
std::map<std::size_t, float> weights;
std::vector<std::size_t> const & adj_faces = mesh_info[vertex_id].faces;
for (std::size_t adj_face : adj_faces) {
std::size_t v0 = mesh_faces[adj_face * 3];
std::size_t v1 = mesh_faces[adj_face * 3 + 1];
std::size_t v2 = mesh_faces[adj_face * 3 + 2];
if (v1 == vertex_id) std::swap(v1, v0);
if (v2 == vertex_id) std::swap(v2, v0);
math::Vec3f v01 = vertices[v1] - vertices[v0];
float v01n = v01.norm();
math::Vec3f v02 = vertices[v2] - vertices[v0];
float v02n = v02.norm();
/* Ensure numerical stability */
if (v01n * v02n < std::numeric_limits<float>::epsilon()) return false;
float alpha = std::acos(v01.dot(v02) / (v01n * v02n));
weights[g2l[v1]] += std::tan(alpha / 2.0f) / v01n;
weights[g2l[v2]] += std::tan(alpha / 2.0f) / v02n;
}
std::map<std::size_t, float>::iterator it;
float sum = 0.0f;
for (it = weights.begin(); it != weights.end(); ++it)
sum += it->second;
assert(sum > 0.0f);
for (it = weights.begin(); it != weights.end(); ++it)
it->second /= sum;
bx[idx[j]] = 0.0f;
by[idx[j]] = 0.0f;
for (it = weights.begin(); it != weights.end(); ++it) {
if (is_border[it->first]) {
std::size_t border_vertex_id = border[idx[it->first]];
bx[idx[j]] += projections[g2l[border_vertex_id]][0] * it->second;
by[idx[j]] += projections[g2l[border_vertex_id]][1] * it->second;
} else {
coeff.push_back(Triplet(idx[j], idx[it->first], -it->second));
}
}
}
for (std::size_t j = 0; j < matrix_size; ++j) {
coeff.push_back(Triplet(j, j, 1.0f));
}
typedef Eigen::SparseMatrix<float> SpMat;
SpMat A(matrix_size, matrix_size);
A.setFromTriplets(coeff.begin(), coeff.end());
Eigen::SparseLU<SpMat> solver;
solver.analyzePattern(A);
solver.factorize(A);
xx = solver.solve(bx);
xy = solver.solve(by);
}
float const max_hole_patch_size = MAX_HOLE_PATCH_SIZE;
int image_size = std::min(std::floor(radius * 1.1f) * 2.0f, max_hole_patch_size);
/* Ensure a minimum scale of one */
image_size += 2 * (1 + texture_patch_border);
int scale = image_size / 2 - texture_patch_border;
for (std::size_t j = 0, k = 0; j < num_vertices; ++j) {
if (is_border[j]) {
projections[j] = projections[j] * scale + image_size / 2;
} else {
projections[j] = math::Vec2f(xx[k], xy[k]) * scale + image_size / 2;
++k;
}
}
mve::ByteImage::Ptr image = mve::ByteImage::create(image_size, image_size, 3);
//DEBUG image->fill_color(*math::Vec4uc(0, 255, 0, 255));
std::vector<math::Vec2f> texcoords; texcoords.reserve(hole.size());
for (std::size_t const face_id : hole) {
for (std::size_t j = 0; j < 3; ++j) {
std::size_t const vertex_id = mesh_faces[face_id * 3 + j];
math::Vec2f const & projection = projections[g2l[vertex_id]];
texcoords.push_back(projection);
}
}
TexturePatch::Ptr texture_patch = TexturePatch::create(0, hole, texcoords, image);
std::size_t texture_patch_id;
#pragma omp critical
{
texture_patches->push_back(texture_patch);
texture_patch_id = texture_patches->size() - 1;
}
for (std::size_t j = 0; j < num_vertices; ++j) {
std::size_t const vertex_id = l2g[j];
std::vector<std::size_t> const & adj_faces = mesh_info[vertex_id].faces;
std::vector<std::size_t> faces; faces.reserve(adj_faces.size());
for (std::size_t adj_face : adj_faces) {
if (graph.get_label(adj_face) == 0) {
faces.push_back(adj_face);
}
}
VertexProjectionInfo info = {texture_patch_id, projections[j], faces};
#pragma omp critical
vertex_projection_infos->at(vertex_id).push_back(info);
}
return true;
}
void
generate_texture_patches(UniGraph const & graph, std::vector<TextureView> const & texture_views,
mve::TriangleMesh::ConstPtr mesh, mve::VertexInfoList::ConstPtr vertex_infos,
std::vector<std::vector<VertexProjectionInfo> > * vertex_projection_infos,
std::vector<TexturePatch> * texture_patches) {
util::WallTimer timer;
mve::TriangleMesh::FaceList const & mesh_faces = mesh->get_faces();
mve::TriangleMesh::VertexList const & vertices = mesh->get_vertices();
vertex_projection_infos->resize(vertices.size());
std::size_t num_patches = 0;
std::cout << "\tRunning... " << std::flush;
#pragma omp parallel for schedule(dynamic)
for (std::size_t i = 0; i < texture_views.size(); ++i) {
std::vector<std::vector<std::size_t> > subgraphs;
int const label = i + 1;
graph.get_subgraphs(label, &subgraphs);
std::list<TexturePatchCandidate> candidates;
for (std::size_t j = 0; j < subgraphs.size(); ++j) {
candidates.push_back(generate_candidate(label, texture_views[i], subgraphs[j], mesh));
}
/* Merge candidates which contain the same image content. */
std::list<TexturePatchCandidate>::iterator it, sit;
for (it = candidates.begin(); it != candidates.end(); ++it) {
for (sit = candidates.begin(); sit != candidates.end();) {
Rect<int> bounding_box = sit->bounding_box;
if (it != sit && bounding_box.is_inside(&it->bounding_box)) {
TexturePatch::Faces & faces = it->texture_patch.get_faces();
TexturePatch::Faces & ofaces = sit->texture_patch.get_faces();
faces.insert(faces.end(), ofaces.begin(), ofaces.end());
TexturePatch::Texcoords & texcoords = it->texture_patch.get_texcoords();
TexturePatch::Texcoords & otexcoords = sit->texture_patch.get_texcoords();
math::Vec2f offset;
offset[0] = sit->bounding_box.min_x - it->bounding_box.min_x;
offset[1] = sit->bounding_box.min_y - it->bounding_box.min_y;
for (std::size_t i = 0; i < otexcoords.size(); ++i) {
texcoords.push_back(otexcoords[i] + offset);
}
sit = candidates.erase(sit);
} else {
++sit;
}
}
}
it = candidates.begin();
for (; it != candidates.end(); ++it) {
std::size_t texture_patch_id;
#pragma omp critical
{
texture_patches->push_back(it->texture_patch);
texture_patch_id = num_patches++;
}
std::vector<std::size_t> const & faces = it->texture_patch.get_faces();
std::vector<math::Vec2f> const & texcoords = it->texture_patch.get_texcoords();
for (std::size_t i = 0; i < faces.size(); ++i) {
std::size_t const face_id = faces[i];
std::size_t const face_pos = face_id * 3;
for (std::size_t j = 0; j < 3; ++j) {
std::size_t const vertex_id = mesh_faces[face_pos + j];
math::Vec2f const projection = texcoords[i * 3 + j];
VertexProjectionInfo info = {texture_patch_id, projection, {face_id}};
#pragma omp critical
vertex_projection_infos->at(vertex_id).push_back(info);
}
}
}
}
merge_vertex_projection_infos(vertex_projection_infos);
std::size_t num_holes = 0;
std::size_t num_hole_faces = 0;
//if (!settings.skip_hole_filling) {
{
std::vector<std::vector<std::size_t> > subgraphs;
graph.get_subgraphs(0, &subgraphs);
#pragma omp parallel for schedule(dynamic)
for (std::size_t i = 0; i < subgraphs.size(); ++i) {
std::vector<std::size_t> const & subgraph = subgraphs[i];
std::map<std::size_t, std::set<std::size_t> > tmp;
for (std::size_t const face_id : subgraph) {
std::size_t const v0 = mesh_faces[face_id * 3];
std::size_t const v1 = mesh_faces[face_id * 3 + 1];
std::size_t const v2 = mesh_faces[face_id * 3 + 2];
tmp[v0].insert(face_id);
tmp[v1].insert(face_id);
tmp[v2].insert(face_id);
}
std::size_t const num_vertices = tmp.size();
/* Only fill small holes. */
if (num_vertices > 100) {
//std::cerr << "Hole to large" << std::endl;
continue;
}
/* Calculate 2D parameterization using the technique from libremesh/patch2d,
* which was published as sourcecode accompanying the following paper:
*
* Isotropic Surface Remeshing
* Simon Fuhrmann, Jens Ackermann, Thomas Kalbe, Michael Goesele
*/
std::size_t seed = -1;
std::vector<bool> is_border(num_vertices, false);
std::vector<std::vector<std::size_t> > adj_verts_via_border(num_vertices);
/* Index structures to map from local <-> global vertex id. */
std::map<std::size_t, std::size_t> g2l;
std::vector<std::size_t> l2g(num_vertices);
/* Index structure to determine column in matrix/vector. */
std::vector<std::size_t> idx(num_vertices);
std::size_t num_border_vertices = 0;
bool disk_topology = true;
std::map<std::size_t, std::set<std::size_t> >::iterator it = tmp.begin();
for (std::size_t j = 0; j < num_vertices; ++j, ++it) {
std::size_t vertex_id = it->first;
g2l[vertex_id] = j;
l2g[j] = vertex_id;
/* Check topology in original mesh. */
if (vertex_infos->at(vertex_id).vclass != mve::VERTEX_CLASS_SIMPLE) {
//std::cerr << "Complex/Border vertex in original mesh" << std::endl;
disk_topology = false;
break;
}
/* Check new topology and determine if vertex is now at the border. */
std::vector<std::size_t> const & adj_faces = vertex_infos->at(vertex_id).faces;
std::set<std::size_t> const & adj_hole_faces = it->second;
std::vector<std::pair<std::size_t, std::size_t> > fan;
for (std::size_t k = 0; k < adj_faces.size(); ++k) {
std::size_t adj_face = adj_faces[k];
if (graph.get_label(adj_faces[k]) == 0 &&
adj_hole_faces.find(adj_face) != adj_hole_faces.end()) {
std::size_t curr = adj_faces[k];
std::size_t next = adj_faces[(k + 1) % adj_faces.size()];
std::pair<std::size_t, std::size_t> pair(curr, next);
fan.push_back(pair);
}
}
std::size_t gaps = 0;
for (std::size_t k = 0; k < fan.size(); k++) {
std::size_t curr = fan[k].first;
std::size_t next = fan[(k + 1) % fan.size()].first;
if (fan[k].second != next) {
++gaps;
for (std::size_t l = 0; l < 3; ++l) {
if(mesh_faces[curr * 3 + l] == vertex_id) {
std::size_t second = mesh_faces[curr * 3 + (l + 2) % 3];
adj_verts_via_border[j].push_back(second);
}
if(mesh_faces[next * 3 + l] == vertex_id) {
std::size_t first = mesh_faces[next * 3 + (l + 1) % 3];
adj_verts_via_border[j].push_back(first);
}
}
}
}
is_border[j] = gaps == 1;
/* Check if vertex is now complex. */
if (gaps > 1) {
//std::cerr << "Complex vertex in hole" << std::endl;
disk_topology = false;
break;
}
if (is_border[j]) {
idx[j] = num_border_vertices++;
seed = vertex_id;
} else {
idx[j] = j - num_border_vertices;
}
}
tmp.clear();
if (!disk_topology) continue;
if (num_border_vertices == 0) {
//std::cerr << "Genus zero topology" << std::endl;
continue;
}
std::vector<std::size_t> border; border.reserve(num_border_vertices);
std::size_t prev = seed;
std::size_t curr = seed;
while (prev == seed || curr != seed) {
std::size_t next = std::numeric_limits<std::size_t>::max();
std::vector<std::size_t> const & adj_verts = adj_verts_via_border[g2l[curr]];
for (std::size_t adj_vert : adj_verts) {
assert(is_border[g2l[adj_vert]]);
if (adj_vert != prev && adj_vert != curr) {
next = adj_vert;
break;
}
}
if (next != std::numeric_limits<std::size_t>::max()) {
prev = curr;
curr = next;
border.push_back(next);
} else {
//std::cerr << "No new border vertex" << std::endl;
border.clear();
break;
}
if (border.size() > num_border_vertices) {
//std::cerr << "Loop within border" << std::endl;
break;
}
}
if (border.size() != num_border_vertices) {
continue;
}
float total_length = 0.0f;
float total_projection_length = 0.0f;
for (std::size_t j = 0; j < border.size(); ++j) {
std::size_t vi0 = border[j];
std::size_t vi1 = border[(j + 1) % border.size()];
std::vector<VertexProjectionInfo> const & vpi0 = vertex_projection_infos->at(vi0);
std::vector<VertexProjectionInfo> const & vpi1 = vertex_projection_infos->at(vi0);
/* According to the previous checks (vertex class within the origial
* mesh and boundary) there already has to be at least one projection
* of each border vertex. */
assert(!vpi0.empty() && !vpi1.empty());
math::Vec2f vp0(0.0f), vp1(0.0f);
for (VertexProjectionInfo const & info0 : vpi0) {
for (VertexProjectionInfo const & info1 : vpi1) {
if (info0.texture_patch_id == info1.texture_patch_id) {
vp0 = info0.projection;
vp1 = info1.projection;
break;
}
}
}
total_projection_length += (vp0 - vp1).norm();
math::Vec3f const & v0 = vertices[vi0];
math::Vec3f const & v1 = vertices[vi1];
total_length += (v0 - v1).norm();
}
float radius = total_projection_length / (2.0f * MATH_PI);
float length = 0.0f;
std::vector<math::Vec2f> projections(num_vertices);
for (std::size_t j = 0; j < border.size(); ++j) {
float angle = 2.0f * MATH_PI * (length / total_length);
projections[g2l[border[j]]] = math::Vec2f(std::cos(angle), std::sin(angle));
math::Vec3f const & v0 = vertices[border[j]];
math::Vec3f const & v1 = vertices[border[(j + 1) % border.size()]];
length += (v0 - v1).norm();
}
typedef Eigen::Triplet<float, int> Triplet;
std::vector<Triplet> coeff;
std::size_t matrix_size = num_vertices - border.size();
Eigen::VectorXf xx(matrix_size), xy(matrix_size);
if (matrix_size != 0) {
Eigen::VectorXf bx(matrix_size);
Eigen::VectorXf by(matrix_size);
for (std::size_t j = 0; j < num_vertices; ++j) {
if (is_border[j]) continue;
std::size_t const vertex_id = l2g[j];
/* Calculate "Mean Value Coordinates" as proposed by Michael S. Floater */
std::map<std::size_t, float> weights;
std::vector<std::size_t> const & adj_faces = vertex_infos->at(vertex_id).faces;
for (std::size_t adj_face : adj_faces) {
std::size_t v0 = mesh_faces[adj_face * 3];
std::size_t v1 = mesh_faces[adj_face * 3 + 1];
std::size_t v2 = mesh_faces[adj_face * 3 + 2];
if (v1 == vertex_id) std::swap(v1, v0);
if (v2 == vertex_id) std::swap(v2, v0);
math::Vec3f v01 = vertices[v1] - vertices[v0];
float v01n = v01.norm();
math::Vec3f v02 = vertices[v2] - vertices[v0];
float v02n = v02.norm();
float alpha = std::acos(v01.dot(v02) / (v01n * v02n));
weights[g2l[v1]] += std::tan(alpha / 2.0f) / v01n;
weights[g2l[v2]] += std::tan(alpha / 2.0f) / v02n;
}
std::map<std::size_t, float>::iterator it;
float sum = 0.0f;
for (it = weights.begin(); it != weights.end(); ++it)
sum += it->second;
for (it = weights.begin(); it != weights.end(); ++it)
it->second /= sum;
bx[idx[j]] = 0.0f;
by[idx[j]] = 0.0f;
for (it = weights.begin(); it != weights.end(); ++it) {
if (is_border[it->first]) {
std::size_t border_vertex_id = border[idx[it->first]];
bx[idx[j]] += projections[g2l[border_vertex_id]][0] * it->second;
by[idx[j]] += projections[g2l[border_vertex_id]][1] * it->second;
} else {
coeff.push_back(Triplet(idx[j], idx[it->first], -it->second));
}
}
}
for (std::size_t j = 0; j < matrix_size; ++j) {
coeff.push_back(Triplet(j, j, 1.0f));
}
typedef Eigen::SparseMatrix<float> SpMat;
SpMat A(matrix_size, matrix_size);
A.setFromTriplets(coeff.begin(), coeff.end());
Eigen::SparseLU<SpMat> solver;
solver.analyzePattern(A);
solver.factorize(A);
xx = solver.solve(bx);
xy = solver.solve(by);
}
int image_size = std::floor(radius * 1.1f) * 2 + 4;
int scale = image_size / 2 - texture_patch_border;
for (std::size_t j = 0, k = 0; j < num_vertices; ++j) {
if (!is_border[j]) {
projections[j] = math::Vec2f(xx[k], xy[k]) * scale + image_size / 2;
++k;
} else {
projections[j] = projections[j] * scale + image_size / 2;
}
}
mve::ByteImage::Ptr image = mve::ByteImage::create(image_size, image_size, 3);
//DEBUG image->fill_color(*math::Vec4uc(0, 255, 0, 255));
std::vector<math::Vec2f> texcoords; texcoords.reserve(subgraph.size());
for (std::size_t const face_id : subgraph) {
for (std::size_t j = 0; j < 3; ++j) {
std::size_t const vertex_id = mesh_faces[face_id * 3 + j];
math::Vec2f const & projection = projections[g2l[vertex_id]];
texcoords.push_back(projection);
}
}
TexturePatch texture_patch(0, subgraph, texcoords, image);
std::size_t texture_patch_id;
#pragma omp critical
{
texture_patches->push_back(texture_patch);
texture_patch_id = num_patches++;
num_hole_faces += subgraph.size();
++num_holes;
}
for (std::size_t j = 0; j < num_vertices; ++j) {
std::size_t const vertex_id = l2g[j];
std::vector<std::size_t> const & adj_faces = vertex_infos->at(vertex_id).faces;
std::vector<std::size_t> faces; faces.reserve(adj_faces.size());
for (std::size_t adj_face : adj_faces) {
if (graph.get_label(adj_face) == 0) {
faces.push_back(adj_face);
}
}
VertexProjectionInfo info = {texture_patch_id, projections[j], faces};
#pragma omp critical
vertex_projection_infos->at(vertex_id).push_back(info);
}
}
}
merge_vertex_projection_infos(vertex_projection_infos);
std::cout << "done. (Took " << timer.get_elapsed_sec() << "s)" << std::endl;
std::cout << "\t" << num_patches << " texture patches." << std::endl;
std::cout << "\t" << num_holes << " holes (" << num_hole_faces << " faces)." << std::endl;
}
