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Streamlined hollowing method.

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This commit is contained in:
tamasmeszaros 2019-11-05 17:00:11 +01:00
parent 4d8631fef6
commit f913be2d93
1 changed files with 25 additions and 18 deletions
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43
tests/libslic3r/test_hollowing.cpp
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@ -22,39 +22,46 @@ static Slic3r::TriangleMesh load_model(const std::string &obj_filename)
return mesh; return mesh;
} }
TEST_CASE("Negative 3D offset should produce smaller object.", "[Hollowing]") static Slic3r::TriangleMesh hollowed_interior(const Slic3r::TriangleMesh &mesh,
double min_thickness)
{ {
Slic3r::TriangleMesh in_mesh = load_model("20mm_cube.obj"); Slic3r::sla::Contour3D imesh = Slic3r::sla::Contour3D{mesh};
in_mesh.scale(3.);
Slic3r::sla::Contour3D imesh = Slic3r::sla::Contour3D{in_mesh};
Benchmark bench; double scale = std::max(1.0, 3. / min_thickness);
bench.start(); double offset = scale * min_thickness;
float range = float(std::max(2 * offset, scale));
openvdb::math::Transform tr; for (auto &p : imesh.points) p *= scale;
auto ptr = Slic3r::meshToVolume(imesh, {}, 0.0f, 10.0f); auto ptr = Slic3r::meshToVolume(imesh, {}, 0.1f * float(offset), range);
REQUIRE(ptr); REQUIRE(ptr);
openvdb::tools::Filter<openvdb::FloatGrid>{*ptr}.gaussian(1, 3); openvdb::tools::Filter<openvdb::FloatGrid>{*ptr}.gaussian(int(scale), 1);
double iso_surface = -offset;
double iso_surface = -3.0; double adaptivity = 0.;
double adaptivity = 0.5;
Slic3r::sla::Contour3D omesh = Slic3r::volumeToMesh(*ptr, iso_surface, adaptivity); Slic3r::sla::Contour3D omesh = Slic3r::volumeToMesh(*ptr, iso_surface, adaptivity);
REQUIRE(!omesh.empty()); REQUIRE(!omesh.empty());
imesh.merge(omesh); for (auto &p : omesh.points) p /= scale;
for (auto &p : imesh.points) p /= 3.; return to_triangle_mesh(omesh);
}
TEST_CASE("Negative 3D offset should produce smaller object.", "[Hollowing]")
{
Slic3r::TriangleMesh in_mesh = load_model("20mm_cube.obj");
Benchmark bench;
bench.start();
Slic3r::TriangleMesh out_mesh = hollowed_interior(in_mesh, 2);
bench.stop(); bench.stop();
std::cout << "Elapsed processing time: " << bench.getElapsedSec() << std::endl; std::cout << "Elapsed processing time: " << bench.getElapsedSec() << std::endl;
std::fstream merged_outfile("merged_out.obj", std::ios::out);
imesh.to_obj(merged_outfile);
std::fstream outfile("out.obj", std::ios::out); in_mesh.merge(out_mesh);
omesh.to_obj(outfile); in_mesh.require_shared_vertices();
in_mesh.WriteOBJFile("merged_out.obj");
} }