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Correct center grid multiline (#13422)

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This commit is contained in:
Rodrigo Faselli
2026-05-01 20:43:13 -03:00
committed by GitHub
parent 699a11f75e
commit 3cf187c727
1 changed files with 13 additions and 14 deletions
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27
src/libslic3r/Fill/FillRectilinear.cpp
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@@ -3088,12 +3088,13 @@ bool FillRectilinear::fill_surface_trapezoidal(
case 0: // Grid / Trapezoidal
{
// Generate a non-crossing trapezoidal pattern to avoid overextrusion at intersections when `multiline > 1`.
// P1--P2
// / \
// P0/ \P3__P4
// P2--P3
// / \
// P0_P1/ \P4_
//
// P1x-P2x=P3x-P4x=d1
// P0y-P1y=P2y-P3y=d2
// P0xP1x=P4xP0x=d1/2
// P2xP3x=d1
// P1yP2y=P2yP3y=d2
const coord_t d2 = coord_t(0.5 * period - d1);
@@ -3113,11 +3114,11 @@ bool FillRectilinear::fill_surface_trapezoidal(
// Build complete rows from xmin to xmax
for (coord_t x = xmin; x < xmax; x += period) {
// Normal row
base_row_normal.points.emplace_back(Point(x, d1 / 2)); // P0
base_row_normal.points.emplace_back(Point(x + d1, d1 / 2)); // P1
base_row_normal.points.emplace_back(Point(x + d1 + d2, d1 / 2 + d2)); // P2
base_row_normal.points.emplace_back(Point(x + 2 * d1 + d2, d1 / 2 + d2)); // P3
base_row_normal.points.emplace_back(Point(x + 2 * d1 + 2 * d2, d1 / 2)); // P4
base_row_normal.points.emplace_back(Point(x, d1 / 2)); // P0
base_row_normal.points.emplace_back(Point(x + d1 / 2, d1 / 2)); // P1
base_row_normal.points.emplace_back(Point(x + d1 / 2 + d2, d1 / 2 + d2)); // P2
base_row_normal.points.emplace_back(Point(x + d1 / 2 + d2 + d1, d1 / 2 + d2)); // P3
base_row_normal.points.emplace_back(Point(x + period - d1 / 2, d1 / 2)); // P4
}
// Flipped row (mirrored vertically)
@@ -3150,8 +3151,6 @@ bool FillRectilinear::fill_surface_trapezoidal(
for (Polyline& pl : polylines) {
for (Point& p : pl.points) {
std::swap(p.x(), p.y());
p.x() += d1 / 2;
p.y() -= d1 / 2;
}
}
}
@@ -3165,8 +3164,8 @@ bool FillRectilinear::fill_surface_trapezoidal(
// / \
// P0/ \P3_P4
// ----------------
// P1x-P2x=P3x-P4x=d2
// P0y-P1y=P2y-P3y=h-2d1
// P1xP2x=P3xP4x=d2
// P0yP1y=P2yP3y=h-2d1
//
// Triangular pattern density adjustment: