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Diffstat (limited to 'tests/libslic3r/test_marchingsquares.cpp')
| -rw-r--r-- | tests/libslic3r/test_marchingsquares.cpp | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/tests/libslic3r/test_marchingsquares.cpp b/tests/libslic3r/test_marchingsquares.cpp new file mode 100644 index 000000000..e9e016157 --- /dev/null +++ b/tests/libslic3r/test_marchingsquares.cpp @@ -0,0 +1,376 @@ +#define NOMINMAX + +#include <catch2/catch.hpp> +#include <test_utils.hpp> + +#include <fstream> + +#include <libslic3r/MarchingSquares.hpp> +#include <libslic3r/SLA/RasterToPolygons.hpp> + +#include <libslic3r/SLA/AGGRaster.hpp> +#include <libslic3r/MTUtils.hpp> +#include <libslic3r/SVG.hpp> +#include <libslic3r/ClipperUtils.hpp> + +#include <libslic3r/TriangulateWall.hpp> +#include <libslic3r/Tesselate.hpp> +#include <libslic3r/SlicesToTriangleMesh.hpp> +#include <libslic3r/SLA/Contour3D.hpp> + +using namespace Slic3r; + +static double area(const sla::RasterBase::PixelDim &pxd) +{ + return pxd.w_mm * pxd.h_mm; +} + +static Slic3r::sla::RasterGrayscaleAA create_raster( + const sla::RasterBase::Resolution &res, + double disp_w = 100., + double disp_h = 100.) +{ + sla::RasterBase::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px}; + + auto bb = BoundingBox({0, 0}, {scaled(disp_w), scaled(disp_h)}); + sla::RasterBase::Trafo trafo; + trafo.center_x = bb.center().x(); + trafo.center_y = bb.center().y(); + + return sla::RasterGrayscaleAA{res, pixdim, trafo, agg::gamma_threshold(.5)}; +} + +static ExPolygon square(double a, Point center = {0, 0}) +{ + ExPolygon poly; + coord_t V = scaled(a / 2.); + + poly.contour.points = {{-V, -V}, {V, -V}, {V, V}, {-V, V}}; + poly.translate(center.x(), center.y()); + + return poly; +} + +static ExPolygon square_with_hole(double a, Point center = {0, 0}) +{ + ExPolygon poly = square(a); + + poly.holes.emplace_back(); + coord_t V = scaled(a / 4.); + poly.holes.front().points = {{-V, V}, {V, V}, {V, -V}, {-V, -V}}; + + poly.translate(center.x(), center.y()); + + return poly; +} + +static ExPolygons circle_with_hole(double r, Point center = {0, 0}) { + + ExPolygon poly; + + std::vector<double> pis = linspace_vector(0., 2 * PI, 100); + + coord_t rs = scaled(r); + for (double phi : pis) { + poly.contour.points.emplace_back(rs * std::cos(phi), rs * std::sin(phi)); + } + + poly.holes.emplace_back(poly.contour); + poly.holes.front().reverse(); + for (auto &p : poly.holes.front().points) p /= 2; + + poly.translate(center.x(), center.y()); + + return {poly}; +} + +static const Vec2i W4x4 = {4, 4}; +static const Vec2i W2x2 = {2, 2}; + +template<class Rst> +static void test_expolys(Rst && rst, + const ExPolygons & ref, + Vec2i window, + const std::string &name = "test") +{ + for (const ExPolygon &expoly : ref) rst.draw(expoly); + + std::fstream out(name + ".png", std::ios::out); + out << rst.encode(sla::PNGRasterEncoder{}); + out.close(); + + ExPolygons extracted = sla::raster_to_polygons(rst, window); + + SVG svg(name + ".svg"); + svg.draw(extracted); + svg.draw(ref, "green"); + svg.Close(); + + double max_rel_err = 0.1; + sla::RasterBase::PixelDim pxd = rst.pixel_dimensions(); + double max_abs_err = area(pxd) * scaled(1.) * scaled(1.); + + BoundingBox ref_bb; + for (auto &expoly : ref) ref_bb.merge(expoly.contour.bounding_box()); + + double max_displacement = 4. * (std::pow(pxd.h_mm, 2) + std::pow(pxd.w_mm, 2)); + max_displacement *= scaled<double>(1.) * scaled(1.); + + REQUIRE(extracted.size() == ref.size()); + for (size_t i = 0; i < ref.size(); ++i) { + REQUIRE(extracted[i].contour.is_counter_clockwise()); + REQUIRE(extracted[i].holes.size() == ref[i].holes.size()); + + for (auto &h : extracted[i].holes) REQUIRE(h.is_clockwise()); + + double refa = ref[i].area(); + double abs_err = std::abs(extracted[i].area() - refa); + double rel_err = abs_err / refa; + + REQUIRE((rel_err <= max_rel_err || abs_err <= max_abs_err)); + + BoundingBox bb; + for (auto &expoly : extracted) bb.merge(expoly.contour.bounding_box()); + + Point d = bb.center() - ref_bb.center(); + REQUIRE(double(d.transpose() * d) <= max_displacement); + } +} + +TEST_CASE("Empty raster should result in empty polygons", "[MarchingSquares]") { + sla::RasterGrayscaleAAGammaPower rst{{}, {}, {}}; + ExPolygons extracted = sla::raster_to_polygons(rst); + REQUIRE(extracted.size() == 0); +} + +TEST_CASE("Marching squares directions", "[MarchingSquares]") { + marchsq::Coord crd{1, 1}; + + REQUIRE(step(crd, marchsq::__impl::Dir::left).r == 1); + REQUIRE(step(crd, marchsq::__impl::Dir::left).c == 0); + + REQUIRE(step(crd, marchsq::__impl::Dir::down).r == 2); + REQUIRE(step(crd, marchsq::__impl::Dir::down).c == 1); + + REQUIRE(step(crd, marchsq::__impl::Dir::right).r == 1); + REQUIRE(step(crd, marchsq::__impl::Dir::right).c == 2); + + REQUIRE(step(crd, marchsq::__impl::Dir::up).r == 0); + REQUIRE(step(crd, marchsq::__impl::Dir::up).c == 1); +} + +TEST_CASE("Fully covered raster should result in a rectangle", "[MarchingSquares]") { + auto rst = create_raster({4, 4}, 4., 4.); + + ExPolygon rect = square(4); + + SECTION("Full accuracy") { + test_expolys(rst, {rect}, W2x2, "fully_covered_full_acc"); + } + + SECTION("Half accuracy") { + test_expolys(rst, {rect}, W4x4, "fully_covered_half_acc"); + } +} + +TEST_CASE("4x4 raster with one ring", "[MarchingSquares]") { + + sla::RasterBase::PixelDim pixdim{1, 1}; + + // We need one additional row and column to detect edges + sla::RasterGrayscaleAA rst{{4, 4}, pixdim, {}, agg::gamma_threshold(.5)}; + + // Draw a triangle from individual pixels + rst.draw(square(1., {0500000, 0500000})); + rst.draw(square(1., {1500000, 0500000})); + rst.draw(square(1., {2500000, 0500000})); + + rst.draw(square(1., {1500000, 1500000})); + rst.draw(square(1., {2500000, 1500000})); + + rst.draw(square(1., {2500000, 2500000})); + + std::fstream out("4x4.png", std::ios::out); + out << rst.encode(sla::PNGRasterEncoder{}); + out.close(); + + ExPolygons extracted = sla::raster_to_polygons(rst); + + SVG svg("4x4.svg"); + svg.draw(extracted); + svg.Close(); + + REQUIRE(extracted.size() == 1); +} + +TEST_CASE("4x4 raster with two rings", "[MarchingSquares]") { + + sla::RasterBase::PixelDim pixdim{1, 1}; + + // We need one additional row and column to detect edges + sla::RasterGrayscaleAA rst{{5, 5}, pixdim, {}, agg::gamma_threshold(.5)}; + + SECTION("Ambiguous case with 'ac' square") { + + // Draw a triangle from individual pixels + rst.draw(square(1., {3500000, 2500000})); + rst.draw(square(1., {3500000, 3500000})); + rst.draw(square(1., {2500000, 3500000})); + + rst.draw(square(1., {2500000, 1500000})); + rst.draw(square(1., {1500000, 1500000})); + rst.draw(square(1., {1500000, 2500000})); + + std::fstream out("4x4_ac.png", std::ios::out); + out << rst.encode(sla::PNGRasterEncoder{}); + out.close(); + + ExPolygons extracted = sla::raster_to_polygons(rst); + + SVG svg("4x4_ac.svg"); + svg.draw(extracted); + svg.Close(); + + REQUIRE(extracted.size() == 2); + } + + SECTION("Ambiguous case with 'bd' square") { + + // Draw a triangle from individual pixels + rst.draw(square(1., {3500000, 1500000})); + rst.draw(square(1., {3500000, 2500000})); + rst.draw(square(1., {2500000, 1500000})); + + rst.draw(square(1., {1500000, 2500000})); + rst.draw(square(1., {1500000, 3500000})); + rst.draw(square(1., {2500000, 3500000})); + + std::fstream out("4x4_bd.png", std::ios::out); + out << rst.encode(sla::PNGRasterEncoder{}); + out.close(); + + ExPolygons extracted = sla::raster_to_polygons(rst); + + SVG svg("4x4_bd.svg"); + svg.draw(extracted); + svg.Close(); + + REQUIRE(extracted.size() == 2); + } +} + +TEST_CASE("Square with hole in the middle", "[MarchingSquares]") { + using namespace Slic3r; + + ExPolygons inp = {square_with_hole(50.)}; + + SECTION("Proportional raster, 1x1 mm pixel size, full accuracy") { + test_expolys(create_raster({100, 100}, 100., 100.), inp, W2x2, "square_with_hole_proportional_1x1_mm_px_full"); + } + + SECTION("Proportional raster, 1x1 mm pixel size, half accuracy") { + test_expolys(create_raster({100, 100}, 100., 100.), inp, W4x4, "square_with_hole_proportional_1x1_mm_px_half"); + } + + SECTION("Landscape raster, 1x1 mm pixel size, full accuracy") { + test_expolys(create_raster({150, 100}, 150., 100.), inp, W2x2, "square_with_hole_landsc_1x1_mm_px_full"); + } + + SECTION("Landscape raster, 1x1 mm pixel size, half accuracy") { + test_expolys(create_raster({150, 100}, 150., 100.), inp, W4x4, "square_with_hole_landsc_1x1_mm_px_half"); + } + + SECTION("Portrait raster, 1x1 mm pixel size, full accuracy") { + test_expolys(create_raster({100, 150}, 100., 150.), inp, W2x2, "square_with_hole_portrait_1x1_mm_px_full"); + } + + SECTION("Portrait raster, 1x1 mm pixel size, half accuracy") { + test_expolys(create_raster({100, 150}, 100., 150.), inp, W4x4, "square_with_hole_portrait_1x1_mm_px_half"); + } + + SECTION("Proportional raster, 2x2 mm pixel size, full accuracy") { + test_expolys(create_raster({200, 200}, 100., 100.), inp, W2x2, "square_with_hole_proportional_2x2_mm_px_full"); + } + + SECTION("Proportional raster, 2x2 mm pixel size, half accuracy") { + test_expolys(create_raster({200, 200}, 100., 100.), inp, W4x4, "square_with_hole_proportional_2x2_mm_px_half"); + } + + SECTION("Proportional raster, 0.5x0.5 mm pixel size, full accuracy") { + test_expolys(create_raster({50, 50}, 100., 100.), inp, W2x2, "square_with_hole_proportional_0.5x0.5_mm_px_full"); + } + + SECTION("Proportional raster, 0.5x0.5 mm pixel size, half accuracy") { + test_expolys(create_raster({50, 50}, 100., 100.), inp, W4x4, "square_with_hole_proportional_0.5x0.5_mm_px_half"); + } +} + +TEST_CASE("Circle with hole in the middle", "[MarchingSquares]") { + using namespace Slic3r; + + test_expolys(create_raster({1000, 1000}), circle_with_hole(25.), W2x2, "circle_with_hole"); +} + +static void recreate_object_from_rasters(const std::string &objname, float lh) { + TriangleMesh mesh = load_model(objname); + + auto bb = mesh.bounding_box(); + Vec3f tr = -bb.center().cast<float>(); + mesh.translate(tr.x(), tr.y(), tr.z()); + bb = mesh.bounding_box(); + + std::vector<ExPolygons> layers; + slice_mesh(mesh, grid(float(bb.min.z()) + lh, float(bb.max.z()), lh), layers, 0.f, []{}); + + sla::RasterBase::Resolution res{2560, 1440}; + double disp_w = 120.96; + double disp_h = 68.04; + + size_t cntr = 0; + for (ExPolygons &layer : layers) { + auto rst = create_raster(res, disp_w, disp_h); + + for (ExPolygon &island : layer) { + rst.draw(island); + } + +#ifndef NDEBUG + std::fstream out(objname + std::to_string(cntr) + ".png", std::ios::out); + out << rst.encode(sla::PNGRasterEncoder{}); + out.close(); +#endif + + ExPolygons layer_ = sla::raster_to_polygons(rst); +// float delta = scaled(std::min(rst.pixel_dimensions().h_mm, +// rst.pixel_dimensions().w_mm)) / 2; + +// layer_ = expolygons_simplify(layer_, delta); + +#ifndef NDEBUG + SVG svg(objname + std::to_string(cntr) + ".svg", BoundingBox(Point{0, 0}, Point{scaled(disp_w), scaled(disp_h)})); + svg.draw(layer_); + svg.draw(layer, "green"); + svg.Close(); +#endif + + double layera = 0., layera_ = 0.; + for (auto &p : layer) layera += p.area(); + for (auto &p : layer_) layera_ += p.area(); +#ifndef NDEBUG + std::cout << cntr++ << std::endl; +#endif + double diff = std::abs(layera_ - layera); + REQUIRE((diff <= 0.1 * layera || diff < scaled<double>(1.) * scaled<double>(1.))); + + layer = std::move(layer_); + } + + TriangleMesh out = slices_to_triangle_mesh(layers, bb.min.z(), double(lh), double(lh)); + + out.require_shared_vertices(); + out.WriteOBJFile("out_from_rasters.obj"); +} + +TEST_CASE("Recreate object from rasters", "[SL1Import]") { + recreate_object_from_rasters("frog_legs.obj", 0.05f); +} |