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#include "SlicesToTriangleMesh.hpp"
#include "libslic3r/MTUtils.hpp"
#include "libslic3r/SLA/Contour3D.hpp"
#include "libslic3r/ClipperUtils.hpp"
#include "libslic3r/Tesselate.hpp"
#include <tbb/parallel_for.h>
#include <tbb/parallel_reduce.h>
namespace Slic3r {
inline sla::Contour3D wall_strip(const Polygon &poly,
double lower_z_mm,
double upper_z_mm)
{
sla::Contour3D ret;
size_t startidx = ret.points.size();
size_t offs = poly.points.size();
ret.points.reserve(ret.points.size() + 2 *offs);
for (const Point &p : poly.points)
ret.points.emplace_back(to_3d(unscaled(p), lower_z_mm));
for (const Point &p : poly.points)
ret.points.emplace_back(to_3d(unscaled(p), upper_z_mm));
for (size_t i = startidx + 1; i < startidx + offs; ++i) {
ret.faces3.emplace_back(i - 1, i, i + offs - 1);
ret.faces3.emplace_back(i, i + offs, i + offs - 1);
}
ret.faces3.emplace_back(startidx + offs - 1, startidx, startidx + 2 * offs - 1);
ret.faces3.emplace_back(startidx, startidx + offs, startidx + 2 * offs - 1);
return ret;
}
// Same as walls() but with identical higher and lower polygons.
sla::Contour3D inline straight_walls(const Polygon &plate,
double lo_z,
double hi_z)
{
return wall_strip(plate, lo_z, hi_z);
}
sla::Contour3D inline straight_walls(const ExPolygon &plate,
double lo_z,
double hi_z)
{
sla::Contour3D ret;
ret.merge(straight_walls(plate.contour, lo_z, hi_z));
for (auto &h : plate.holes) ret.merge(straight_walls(h, lo_z, hi_z));
return ret;
}
sla::Contour3D inline straight_walls(const ExPolygons &slice,
double lo_z,
double hi_z)
{
sla::Contour3D ret;
for (const ExPolygon &poly : slice)
ret.merge(straight_walls(poly, lo_z, hi_z));
return ret;
}
sla::Contour3D slices_to_triangle_mesh(const std::vector<ExPolygons> &slices,
double zmin,
const std::vector<float> & grid)
{
assert(slices.size() == grid.size());
using Layers = std::vector<sla::Contour3D>;
std::vector<sla::Contour3D> layers(slices.size());
size_t len = slices.size() - 1;
tbb::parallel_for(size_t(0), len, [&slices, &layers, &grid](size_t i) {
const ExPolygons &upper = slices[i + 1];
const ExPolygons &lower = slices[i];
ExPolygons dff1 = diff_ex(lower, upper);
ExPolygons dff2 = diff_ex(upper, lower);
layers[i].merge(triangulate_expolygons_3d(dff1, grid[i], NORMALS_UP));
layers[i].merge(triangulate_expolygons_3d(dff2, grid[i], NORMALS_DOWN));
layers[i].merge(straight_walls(upper, grid[i], grid[i + 1]));
});
sla::Contour3D ret = tbb::parallel_reduce(
tbb::blocked_range(layers.begin(), layers.end()),
sla::Contour3D{},
[](const tbb::blocked_range<Layers::iterator>& r, sla::Contour3D init) {
for(auto it = r.begin(); it != r.end(); ++it ) init.merge(*it);
return init;
},
[]( const sla::Contour3D &a, const sla::Contour3D &b ) {
sla::Contour3D res{a}; res.merge(b); return res;
});
ret.merge(triangulate_expolygons_3d(slices.front(), zmin, NORMALS_DOWN));
ret.merge(straight_walls(slices.front(), zmin, grid.front()));
ret.merge(triangulate_expolygons_3d(slices.back(), grid.back(), NORMALS_UP));
return ret;
}
void slices_to_triangle_mesh(TriangleMesh & mesh,
const std::vector<ExPolygons> &slices,
double zmin,
double lh,
double ilh)
{
std::vector<sla::Contour3D> wall_meshes(slices.size());
std::vector<float> grid(slices.size(), zmin + ilh);
for (size_t i = 1; i < grid.size(); ++i) grid[i] = grid[i - 1] + lh;
sla::Contour3D cntr = slices_to_triangle_mesh(slices, zmin, grid);
mesh.merge(sla::to_triangle_mesh(cntr));
mesh.repaired = true;
mesh.require_shared_vertices();
}
} // namespace Slic3r
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