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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 17:27:32 +08:00
parent 5092831007
commit 6e33f3f5dd
5 changed files with 20 additions and 22 deletions
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src/libslic3r/Support/SupportMaterial.cpp
+3 -7
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@@ -1438,9 +1438,8 @@ static inline ExPolygons detect_overhangs(
const bool bridge_no_support = object_config.bridge_no_support.value;
const coordf_t xy_expansion = scale_(object_config.support_expansion.value);
// Build plate tilt: compute per-layer XY shift for tilted gravity direction
const double tilt_x_rad = Geometry::deg2rad(print_config.build_plate_tilt_x.value);
const double tilt_y_rad = Geometry::deg2rad(print_config.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_config);
const bool has_tilt = tilt_slope.cwiseAbs().maxCoeff() > EPSILON;
float lower_layer_offset = 0;
if (layer_id == 0)
@@ -1480,10 +1479,7 @@ static inline ExPolygons detect_overhangs(
Polygons tilted_lower;
if (has_tilt) {
tilted_lower = lower_layer_polygons;
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(tilted_lower, tilt_shift);
translate(tilted_lower, Point::new_scale(tilt_slope * lower_layer.height));
effective_lower = &tilted_lower;
}