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Perf: avoid unconditional lower-layer polygon copies in support overhang paths (R4, R5)

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SupportMaterial::detect_overhangs copied lower_layer_polygons per region
even without build-plate tilt; hoist the tilted copy out of the region
loop and use the original polygons directly when untilted. TreeSupport3D
flattened lslices_extrudable to Polygons unconditionally; restore the
upstream ExPolygons offset on the untilted path.
This commit is contained in:
harrierpigeon
2026-08-05 03:35:58 -05:00
parent 10810908a9
commit 049612022a
2 changed files with 21 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
src/libslic3r/Support/SupportMaterial.cpp
View File

@@ -1475,6 +1475,19 @@ static inline ExPolygons detect_overhangs(
}
}
// Apply build plate tilt: shift lower layer polygons to simulate tilted gravity.
// This is loop-invariant across regions, so compute it once here.
const Polygons *effective_lower = &lower_layer_polygons;
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);
effective_lower = &tilted_lower;
}
for (LayerRegion *layerm : layer.regions()) {
// Extrusion width accounts for the roundings of the extrudates.
// It is the maximum widh of the extrudate.
@@ -1491,17 +1504,9 @@ 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, effective_lower);
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.
@@ -1512,7 +1517,7 @@ static inline ExPolygons detect_overhangs(
//FIXME cache the lower layer offset if this layer has multiple regions.
diff_polygons =
diff(layerm_polygons,
expand(effective_lower, 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.
@@ -1522,7 +1527,7 @@ static inline ExPolygons detect_overhangs(
// 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
// propagating these contact surfaces downwards.
diff_polygons = diff(intersection(expand(diff_polygons, lower_layer_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS), layerm_polygons), effective_lower);
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.

7
src/libslic3r/Support/TreeSupport3D.cpp
View File

@@ -260,14 +260,17 @@ static std::vector<std::pair<TreeSupportSettings, std::vector<size_t>>> group_me
} else
lower_layer_offset = scaled<float>(lower_layer.height / tan_threshold);
// Apply build plate tilt: shift lower layer polygons to simulate tilted gravity
Polygons lower_src = to_polygons(lower_layer.lslices_extrudable);
Polygons lower_layer_offseted;
if (has_tilt) {
Polygons lower_src = to_polygons(lower_layer.lslices_extrudable);
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(lower_src, tilt_shift);
lower_layer_offseted = offset(lower_src, lower_layer_offset);
} else {
lower_layer_offseted = offset(lower_layer.lslices_extrudable, lower_layer_offset);
}
Polygons lower_layer_offseted = offset(lower_src, lower_layer_offset);
overhangs = diff(current_layer.lslices_extrudable, lower_layer_offseted);
if (lower_layer_offset == 0) {
raw_overhangs = overhangs;