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https://github.com/SoftFever/OrcaSlicer.git
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Brute force optimization code, buggy yet
wip wip wip refactor
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tamasmeszaros
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b4e30cc8ad
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c193d7c930
7 changed files with 427 additions and 227 deletions
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@ -2,23 +2,19 @@
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#include <exception>
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//#include <libnest2d/optimizers/nlopt/genetic.hpp>
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#include <libslic3r/Optimizer.hpp>
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#include <libslic3r/Optimize/BruteforceOptimizer.hpp>
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#include <libslic3r/SLA/Rotfinder.hpp>
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#include <libslic3r/SLA/Concurrency.hpp>
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#include <libslic3r/SLA/SupportTree.hpp>
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#include <libslic3r/SLA/SupportPointGenerator.hpp>
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#include <libslic3r/SimplifyMesh.hpp>
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#include "Model.hpp"
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#include <thread>
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namespace Slic3r {
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namespace sla {
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double area(const Vec3d &p1, const Vec3d &p2, const Vec3d &p3) {
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Vec3d a = p2 - p1;
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Vec3d b = p3 - p1;
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Vec3d c = a.cross(b);
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return 0.5 * c.norm();
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}
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using VertexFaceMap = std::vector<std::vector<size_t>>;
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VertexFaceMap create_vertex_face_map(const TriangleMesh &mesh) {
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@ -35,61 +31,75 @@ VertexFaceMap create_vertex_face_map(const TriangleMesh &mesh) {
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return vmap;
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}
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// Find transformed mesh ground level without copy and with parallell reduce.
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double find_ground_level(const TriangleMesh &mesh,
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const Transform3d & tr,
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size_t threads)
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{
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size_t vsize = mesh.its.vertices.size();
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auto minfn = [](double a, double b) { return std::min(a, b); };
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auto findminz = [&mesh, &tr] (size_t vi, double submin) {
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Vec3d v = tr * mesh.its.vertices[vi].template cast<double>();
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return std::min(submin, v.z());
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};
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double zmin = mesh.its.vertices.front().z();
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return ccr_par::reduce(size_t(0), vsize, zmin, findminz, minfn,
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vsize / threads);
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}
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// Try to guess the number of support points needed to support a mesh
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double calculate_model_supportedness(const TriangleMesh & mesh,
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const VertexFaceMap &vmap,
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// const VertexFaceMap &vmap,
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const Transform3d & tr)
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{
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static const double POINTS_PER_UNIT_AREA = 1.;
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static const Vec3d DOWN = {0., 0., -1.};
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static constexpr double POINTS_PER_UNIT_AREA = 1.;
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double score = 0.;
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if (mesh.its.vertices.empty()) return std::nan("");
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// double zmin = mesh.bounding_box().min.z();
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size_t Nthr = std::thread::hardware_concurrency();
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size_t facesize = mesh.its.indices.size();
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// std::vector<Vec3d> normals(mesh.its.indices.size(), Vec3d::Zero());
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double zmin = find_ground_level(mesh, tr, Nthr);
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double zmin = 0;
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for (auto & v : mesh.its.vertices)
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zmin = std::min(zmin, double((tr * v.cast<double>()).z()));
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auto score_mergefn = [&mesh, &tr, zmin](size_t fi, double subscore) {
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static const Vec3d DOWN = {0., 0., -1.};
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for (size_t fi = 0; fi < mesh.its.indices.size(); ++fi) {
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const auto &face = mesh.its.indices[fi];
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Vec3d p1 = tr * mesh.its.vertices[face(0)].cast<double>();
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Vec3d p2 = tr * mesh.its.vertices[face(1)].cast<double>();
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Vec3d p3 = tr * mesh.its.vertices[face(2)].cast<double>();
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Vec3d p1 = tr * mesh.its.vertices[face(0)].template cast<double>();
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Vec3d p2 = tr * mesh.its.vertices[face(1)].template cast<double>();
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Vec3d p3 = tr * mesh.its.vertices[face(2)].template cast<double>();
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// auto triang = std::array<Vec3d, 3> {p1, p2, p3};
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// double a = area(triang.begin(), triang.end());
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double a = area(p1, p2, p3);
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Vec3d U = p2 - p1;
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Vec3d V = p3 - p1;
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Vec3d C = U.cross(V);
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Vec3d N = C.normalized();
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double area = 0.5 * C.norm();
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double zlvl = zmin + 0.1;
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if (p1.z() <= zlvl && p2.z() <= zlvl && p3.z() <= zlvl) {
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score += a * POINTS_PER_UNIT_AREA;
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continue;
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// score += area * POINTS_PER_UNIT_AREA;
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return subscore;
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}
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double phi = 1. - std::acos(N.dot(DOWN)) / PI;
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phi = phi * (phi > 0.5);
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Eigen::Vector3d U = p2 - p1;
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Eigen::Vector3d V = p3 - p1;
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Vec3d N = U.cross(V).normalized();
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// std::cout << "area: " << area << std::endl;
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double phi = std::acos(N.dot(DOWN)) / PI;
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subscore += area * POINTS_PER_UNIT_AREA * phi;
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std::cout << "area: " << a << std::endl;
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return subscore;
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};
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score += a * POINTS_PER_UNIT_AREA * phi;
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// normals[fi] = N;
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}
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double score = ccr_seq::reduce(size_t(0), facesize, 0., score_mergefn,
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std::plus<double>{}, facesize / Nthr);
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// for (size_t vi = 0; vi < mesh.its.vertices.size(); ++vi) {
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// const std::vector<size_t> &neighbors = vmap[vi];
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// const auto &v = mesh.its.vertices[vi];
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// Vec3d vt = tr * v.cast<double>();
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// }
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return score;
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return score / mesh.its.indices.size();
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}
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std::array<double, 2> find_best_rotation(const ModelObject& modelobj,
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@ -97,7 +107,7 @@ std::array<double, 2> find_best_rotation(const ModelObject& modelobj,
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std::function<void(unsigned)> statuscb,
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std::function<bool()> stopcond)
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{
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static const unsigned MAX_TRIES = 1000000;
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static const unsigned MAX_TRIES = 100;
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// return value
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std::array<double, 2> rot;
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@ -126,12 +136,14 @@ std::array<double, 2> find_best_rotation(const ModelObject& modelobj,
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auto objfunc = [&mesh, &status, &statuscb, &stopcond, max_tries]
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(const opt::Input<2> &in)
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{
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std::cout << "in: " << in[0] << " " << in[1] << std::endl;
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// prepare the rotation transformation
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Transform3d rt = Transform3d::Identity();
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rt.rotate(Eigen::AngleAxisd(in[1], Vec3d::UnitY()));
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rt.rotate(Eigen::AngleAxisd(in[0], Vec3d::UnitX()));
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double score = sla::calculate_model_supportedness(mesh, {}, rt);
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double score = sla::calculate_model_supportedness(mesh, rt);
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std::cout << score << std::endl;
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// report status
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@ -142,10 +154,11 @@ std::array<double, 2> find_best_rotation(const ModelObject& modelobj,
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// Firing up the genetic optimizer. For now it uses the nlopt library.
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opt::Optimizer<opt::AlgNLoptDIRECT> solver(opt::StopCriteria{}
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.max_iterations(max_tries)
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.rel_score_diff(1e-3)
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.stop_condition(stopcond));
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opt::Optimizer<opt::AlgBruteForce> solver(opt::StopCriteria{}
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.max_iterations(max_tries)
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.rel_score_diff(1e-6)
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.stop_condition(stopcond),
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10 /*grid size*/);
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// We are searching rotations around the three axes x, y, z. Thus the
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// problem becomes a 3 dimensional optimization task.
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@ -153,7 +166,7 @@ std::array<double, 2> find_best_rotation(const ModelObject& modelobj,
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auto b = opt::Bound{-PI, PI};
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// Now we start the optimization process with initial angles (0, 0, 0)
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auto result = solver.to_max().optimize(objfunc, opt::initvals({0.0, 0.0}),
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auto result = solver.to_min().optimize(objfunc, opt::initvals({0.0, 0.0}),
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opt::bounds({b, b}));
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// Save the result and fck off
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