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HanifKoh
8a6377f087
* Add Missing Includes Across src/libslic3r Every libslic3r source and header now directly includes the headers declaring what it uses, rather than relying on the precompiled header or transitive includes. Generated with clang-tidy misc-include-cleaner, with libslic3r headers spelled libslic3r/... so they resolve outside the library's private include paths. MultiMaterialSegmentation.hpp, Support/SupportParameters.hpp and Format/STEP.hpp are made self-contained by hand. * Make the libslic3r Headers Compile on Their Own Each now includes, or forward-declares, what it uses instead of relying on what its includers happened to include first. Left out: I18N.hpp, which errors on purpose when included from GUI code, and VoxelizeCSGMesh.hpp and SLA/bicubic.h, which nothing includes and which no longer compile at all. * Add the Includes Missing From the Hand-Fixed libslic3r Headers clang-tidy would not edit these headers while they failed to compile on their own, so the first pass skipped them. With the headers now self-contained, a second pass adds the rest. * Keep Windows Setup Ahead of the Added libslic3r Includes Print.cpp and Thread.cpp open with a _WIN32 block that has to come first; without the precompiled header, Print.cpp otherwise reaches windows.h through OCCT with NONLS defined and boost/regex fails. OpenVDBUtils.cpp and SLA/SupportTreeBuilder.cpp had includes inside #ifndef NOMINMAX, which libslic3r defines on Windows, so those were skipped there. .clang-tidy also ignores the MSVC STL and UCRT internals, Boost.Multiprecision's fwd.hpp and CPython's Windows include directory. * Re-Add libslic3r Includes After the Clipper2 2.0.1 Migration Rebasing onto main took main's version of the files the Clipper2 migration rewrote, so their added includes are restored here, along with includes for main's new code. Clipper2's individual headers are now ignored by clang-tidy: they only build the Z variant through clipper2_z.hpp, which defines USINGZ first, so including clipper.core.h and the like directly broke ClipperZUtils.cpp.
70 lines
3.3 KiB
C++
70 lines
3.3 KiB
C++
#pragma once
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// Quadric error metric decimation (Garland & Heckbert), with two additions that matter on a
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// displaced mesh.
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//
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// Crease quadrics: an interior edge sharper than the threshold gets penalty planes at both endpoints,
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// perpendicular to each adjacent face and through the edge, weighted so such edges collapse last or
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// not at all. A texture's hard step keeps its geometry while the flat ground around it reduces.
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//
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// Flat-face harvesting: the loop keeps going past the triangle target while each collapse's error
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// stays under an absolute bound, so flat faces that cost nothing to remove are not left behind.
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#include <cstddef>
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#include <cstdint>
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#include <functional>
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#include <vector>
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#include "TextureBakeIndex.hpp"
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namespace Slic3r {
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namespace TextureBake {
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// Reject a collapse deviating more than about 78 degrees from the old face normal.
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static constexpr double DECIMATE_FLIP_DOT = 0.2;
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// Edges sharper than 60 degrees are treated as creases.
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static constexpr double DECIMATE_CREASE_COS = 0.5;
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// Quadric penalty weight for a crease plane.
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static constexpr double DECIMATE_CREASE_WEIGHT = 1e4;
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// Most faces a collapse may leave around its surviving vertex. Uncapped, a pinned vertex on flat
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// ground grows a fan of thousands of slivers, and validating each of its edges walks the whole fan,
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// which turns a decimation of a second or two into minutes. At 64 the triangle count moves by about
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// 1% at most, and by far less on large bakes.
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static constexpr int DECIMATE_MAX_VALENCE = 64;
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// Upper bound in mm on the deviation a harvested collapse may introduce; the real one is smaller,
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// since the cost sums squared distances over all incident faces.
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//
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// Absolute, not relative to the cost at which the target was crossed. A relative band fails in the
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// case with the most to shed: when the target is reached with a large flat surplus left, the crossing
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// cost is essentially zero, so the band is too and nothing is harvested.
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static constexpr double DECIMATE_DEFAULT_HARVEST_TOL = 0.005;
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// Returns false to cancel.
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using DecimateProgressFn = std::function<bool(double fraction)>;
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struct DecimateResult
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{
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TriSoup geometry;
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// The locked faces alone met the target, so it was unreachable without touching preserved
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// geometry.
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bool locked_over_budget = false;
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// Reaching the target took a collapse costing more than harvest_tol, so the target removed detail
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// and not only flat faces a harvest would have taken anyway.
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bool target_cost_detail = false;
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};
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// `locked_faces`: one entry per input triangle; a vertex touching one may neither move nor be
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// removed, which also pins the ring between the two regions.
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// `face_color`: optional, one entry per input triangle. An edge between two faces of different
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// colour is treated as a crease, so the simplified triangles never span a colour boundary and the
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// boundary keeps its place - a per-triangle colour read off the result then has nothing to smear.
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DecimateResult decimate(const TriSoup &geometry, size_t target_triangles, bool harvest_flat = true,
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double harvest_tol = DECIMATE_DEFAULT_HARVEST_TOL,
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const std::vector<uint8_t> &locked_faces = {},
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const DecimateProgressFn &on_progress = {},
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const std::vector<int> &face_color = {});
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} // namespace TextureBake
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} // namespace Slic3r
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