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Share and Clamp the Build Plate Tilt Shift in Support Generators

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The three support generators each computed lh * tan(tilt), which overflows
coord_t at 90 degrees and flips sign beyond it (belt sync can write up to
180). One helper now returns the tilt slope with the tilt capped at 89 degrees.
This commit is contained in:
Hanif Koh
2026-09-14 01:32:07 +08:00
parent d0c068a230
commit 8ceb187feb
5 changed files with 20 additions and 22 deletions
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src/libslic3r/Support/TreeSupport.cpp
+3 -7
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@@ -709,9 +709,8 @@ void TreeSupport::detect_overhangs(bool check_support_necessity/* = false*/)
const double threshold_rad = Geometry::deg2rad(thresh_angle);
// Build plate tilt: compute per-layer XY shift for tilted gravity direction
const PrintConfig& print_cfg = m_object->print()->config();
const double tilt_x_rad = Geometry::deg2rad(print_cfg.build_plate_tilt_x.value);
const double tilt_y_rad = Geometry::deg2rad(print_cfg.build_plate_tilt_y.value);
const bool has_tilt = std::abs(tilt_x_rad) > EPSILON || std::abs(tilt_y_rad) > EPSILON;
const Vec2d tilt_slope = build_plate_tilt_slope(print_cfg);
const bool has_tilt = tilt_slope.cwiseAbs().maxCoeff() > EPSILON;
// FIXME this is a fudge constant!
double support_tree_tip_diameter = 0.8;
auto enforcer_overhang_offset = scaled<double>(support_tree_tip_diameter);
@@ -858,10 +857,7 @@ void TreeSupport::detect_overhangs(bool check_support_necessity/* = false*/)
ExPolygons shifted_lower;
if (has_tilt) {
shifted_lower = lower_polys; // copy
const double lh = lower_layer->height;
Point tilt_shift(coord_t(scale_(lh * tan(tilt_y_rad))),
coord_t(scale_(lh * tan(tilt_x_rad))));
translate(shifted_lower, tilt_shift);
translate(shifted_lower, Point::new_scale(tilt_slope * lower_layer->height));
}
const ExPolygons &effective_lower = has_tilt ? shifted_lower : lower_polys;