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stage in changes from off-plate-gravity and remove stuff I didn't need

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This commit is contained in:
harrierpigeon
2026-03-30 13:25:40 -05:00
committed by Joseph Robertson
parent 0a762dfede
commit 08aa277974
26 changed files with 230 additions and 37 deletions
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src/libslic3r/Support/SupportMaterial.cpp
+17 -5
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@@ -1392,6 +1392,10 @@ static inline ExPolygons detect_overhangs(
const double threshold_rad = Geometry::deg2rad(thresh_angle);
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;
float lower_layer_offset = 0;
if (layer_id == 0)
@@ -1441,9 +1445,17 @@ static inline ExPolygons detect_overhangs(
// Overhang polygons for this layer and region.
Polygons diff_polygons;
Polygons layerm_polygons = to_polygons(layerm->slices.surfaces);
// Apply build plate tilt: shift lower layer polygons to simulate tilted gravity
Polygons effective_lower = lower_layer_polygons;
if (has_tilt) {
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(effective_lower, tilt_shift);
}
if (lower_layer_offset == 0.f) {
// Support everything.
diff_polygons = diff(layerm_polygons, lower_layer_polygons);
diff_polygons = diff(layerm_polygons, effective_lower);
if (buildplate_only) {
// Don't support overhangs above the top surfaces.
// This step is done before the contact surface is calculated by growing the overhang region.
@@ -1452,9 +1464,9 @@ static inline ExPolygons detect_overhangs(
} else if (auto_normal_support) {
// Get the regions needing a suport, collapse very tiny spots.
//FIXME cache the lower layer offset if this layer has multiple regions.
diff_polygons =
diff_polygons =
diff(layerm_polygons,
expand(lower_layer_polygons, lower_layer_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS));
expand(effective_lower, lower_layer_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS));
if (buildplate_only && ! annotations.buildplate_covered[layer_id].empty()) {
// Don't support overhangs above the top surfaces.
// This step is done before the contact surface is calculated by growing the overhang region.
@@ -1462,9 +1474,9 @@ static inline ExPolygons detect_overhangs(
}
if (! diff_polygons.empty()) {
// Offset the support regions back to a full overhang, restrict them to the full overhang.
// This is done to increase size of the supporting columns below, as they are calculated by
// This is done to increase size of the supporting columns below, as they are calculated by
// propagating these contact surfaces downwards.
diff_polygons = diff(intersection(expand(diff_polygons, lower_layer_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS), layerm_polygons), lower_layer_polygons);
diff_polygons = diff(intersection(expand(diff_polygons, lower_layer_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS), layerm_polygons), effective_lower);
}
//FIXME add user defined filtering here based on minimal area or minimum radius or whatever.