3DPrinting/PrusaSlicer-NonPlainar
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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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This commit is contained in:
Lukáš Hejl 2022-06-09 09:22:40 +02:00
parent b42e4b2927
commit 46ade54937
3 changed files with 53 additions and 0 deletions
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9
src/clipper/clipper.cpp
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@ -2290,6 +2290,12 @@ void Clipper::ProcessHorizontal(TEdge *horzEdge)
if (horzEdge->OutIdx >= 0 && !IsOpen) //note: may be done multiple times
{
#ifdef CLIPPERLIB_USE_XYZ
if (dir == dLeftToRight)
SetZ(e->Curr, *horzEdge, *e);
else
SetZ(e->Curr, *e, *horzEdge);
#endif
op1 = AddOutPt(horzEdge, e->Curr);
TEdge* eNextHorz = m_SortedEdges;
while (eNextHorz)
@ -2614,6 +2620,9 @@ void Clipper::ProcessEdgesAtTopOfScanbeam(const cInt topY)
{
e->Curr.x() = TopX( *e, topY );
e->Curr.y() = topY;
#ifdef CLIPPERLIB_USE_XYZ
e->Curr.z() = topY == e->Top.y() ? e->Top.z() : (topY == e->Bot.y() ? e->Bot.z() : 0);
#endif
}
//When StrictlySimple and 'e' is being touched by another edge, then

1
tests/fff_print/CMakeLists.txt
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@ -4,6 +4,7 @@ add_executable(${_TEST_NAME}_tests
test_avoid_crossing_perimeters.cpp
test_bridges.cpp
test_cooling.cpp
test_clipper.cpp
test_custom_gcode.cpp
test_data.cpp
test_data.hpp

43
tests/fff_print/test_clipper.cpp Normal file
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@ -0,0 +1,43 @@
#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);
}