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Factorize MC/TMC vertex interpolation functions

This commit is contained in:
Mael Rouxel-Labbé 2025-03-26 22:47:09 +01:00
parent e843cefce0
commit a9082f8575
2 changed files with 14 additions and 22 deletions
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21
Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/marching_cubes_functors.h
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@ -64,12 +64,13 @@ namespace internal {
// Interpolate linearly between two vertex locations v0, v1 with values d0 and d1 according to the isovalue
template <typename GeomTraits>
typename GeomTraits::Point_3 vertex_interpolation(const typename GeomTraits::Point_3& p0,
const typename GeomTraits::Point_3& p1,
const typename GeomTraits::FT d0,
const typename GeomTraits::FT d1,
const typename GeomTraits::FT isovalue,
const GeomTraits& gt)
std::pair<typename GeomTraits::Point_3, typename GeomTraits::FT>
vertex_interpolation(const typename GeomTraits::Point_3& p0,
const typename GeomTraits::Point_3& p1,
const typename GeomTraits::FT d0,
const typename GeomTraits::FT d1,
const typename GeomTraits::FT isovalue,
const GeomTraits& gt)
{
using FT = typename GeomTraits::FT;
@ -88,9 +89,9 @@ typename GeomTraits::Point_3 vertex_interpolation(const typename GeomTraits::Poi
mu = std::clamp<FT>(mu, FT(0), FT(1));
// linear interpolation
return point((FT(1) - mu) * x_coord(p0) + mu * x_coord(p1),
(FT(1) - mu) * y_coord(p0) + mu * y_coord(p1),
(FT(1) - mu) * z_coord(p0) + mu * z_coord(p1));
return { point((FT(1) - mu) * x_coord(p0) + mu * x_coord(p1),
(FT(1) - mu) * y_coord(p0) + mu * y_coord(p1),
(FT(1) - mu) * z_coord(p0) + mu * z_coord(p1)), mu };
}
// retrieves the values of a cell and return the lookup index
@ -173,7 +174,7 @@ void MC_construct_vertices(const typename Domain::cell_descriptor& cell,
vertices[e_id] = vertex_interpolation(corners[v0], corners[v1],
values[v0], values[v1],
isovalue, domain.geom_traits());
isovalue, domain.geom_traits()).first;
}
flag <<= 1;

15
Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/topologically_correct_marching_cubes_functors.h
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@ -399,18 +399,9 @@ private:
unsigned int v0, v1;
get_edge_vertex(eg, v0, v1, l_edges_);
// @todo use the domain's interpolation scheme?
const FT den = values[v1] - values[v0];
FT l = is_zero(den) ? FT(1) / FT(2) : (i0 - values[v0]) / den;
l = std::clamp<FT>(l, FT(0), FT(1));
ecoord[eg] = l;
const FT px = (FT(1) - l) * x_coord(corners[v0]) + l * x_coord(corners[v1]);
const FT py = (FT(1) - l) * y_coord(corners[v0]) + l * y_coord(corners[v1]);
const FT pz = (FT(1) - l) * z_coord(corners[v0]) + l * z_coord(corners[v1]);
vertices[eg] = point(px, py, pz);
std::tie(vertices[eg], ecoord[eg]) = vertex_interpolation(corners[v0], corners[v1],
values[v0], values[v1],
i0, m_domain.geom_traits());
}
// next edge