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Backported a fix from Clipper 6.4.2 for the issue that Clipper Z coordinated has incorrect value because ZFillFunction wasn't called in all cases (https://sourceforge.net/p/polyclipping/bugs/160/). Also, this issue led to duplicity vertices with the same XY coordinates but differ in Z coordinates.

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Lukáš Hejl 2022-06-09 09:22:40 +02:00
parent 0b6c65ee60
commit f460c53d86
3 changed files with 53 additions and 0 deletions
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1
tests/fff_print/CMakeLists.txt
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@ -1,6 +1,7 @@
get_filename_component(_TEST_NAME ${CMAKE_CURRENT_LIST_DIR} NAME)
add_executable(${_TEST_NAME}_tests
${_TEST_NAME}_tests.cpp
test_clipper.cpp
test_data.cpp
test_data.hpp
test_extrusion_entity.cpp

43
tests/fff_print/test_clipper.cpp Normal file
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#include <catch2/catch.hpp>
#include "test_data.hpp"
#include "clipper/clipper_z.hpp"
using namespace Slic3r;
// Test case for an issue with duplicity vertices (same XY coordinates but differ in Z coordinates) in Clipper 6.2.9,
// (related to https://sourceforge.net/p/polyclipping/bugs/160/) that was fixed in Clipper 6.4.2.
SCENARIO("Clipper Z", "[ClipperZ]")
{
ClipperLib_Z::Path subject;
subject.emplace_back(-2000, -1000, 10);
subject.emplace_back(-2000, 1000, 10);
subject.emplace_back( 2000, 1000, 10);
subject.emplace_back( 2000, -1000, 10);
ClipperLib_Z::Path clip;
clip.emplace_back(-1000, -2000, -5);
clip.emplace_back(-1000, 2000, -5);
clip.emplace_back( 1000, 2000, -5);
clip.emplace_back( 1000, -2000, -5);
ClipperLib_Z::Clipper clipper;
clipper.ZFillFunction([](const ClipperLib_Z::IntPoint &e1bot, const ClipperLib_Z::IntPoint &e1top, const ClipperLib_Z::IntPoint &e2bot,
const ClipperLib_Z::IntPoint &e2top, ClipperLib_Z::IntPoint &pt) {
pt.z() = 1;
});
clipper.AddPath(subject, ClipperLib_Z::ptSubject, false);
clipper.AddPath(clip, ClipperLib_Z::ptClip, true);
ClipperLib_Z::PolyTree polytree;
ClipperLib_Z::Paths paths;
clipper.Execute(ClipperLib_Z::ctIntersection, polytree, ClipperLib_Z::pftNonZero, ClipperLib_Z::pftNonZero);
ClipperLib_Z::PolyTreeToPaths(polytree, paths);
REQUIRE(paths.size() == 1);
REQUIRE(paths.front().size() == 2);
for (const ClipperLib_Z::IntPoint &pt : paths.front())
REQUIRE(pt.z() == 1);
}