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FIX: tree support didn't work with enforcer

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Enforcers should also subtract the lower polygons to get overhang areas.

Jira: STUDIO-3692
Github: #2045
Change-Id: I70f4aaae13826efc624e9bc942d2d11e9b1df1a1
(cherry picked from commit fc3d9b24ac1eb14e259488c94fca3469f319b368)
This commit is contained in:
Arthur 2023-07-20 10:33:29 +08:00 • committed by Lane.Wei
parent 44fdfe8fff
commit 9d9673116d
1 changed files with 17 additions and 9 deletions
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16
src/libslic3r/TreeSupport.cpp
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@ -1127,18 +1127,26 @@ void TreeSupport::detect_overhangs(bool detect_first_sharp_tail_only)
for (auto &area : ts_layer->overhang_areas) {
ts_layer->overhang_types.emplace(&area, SupportLayer::Detected);
}
// enforcers
if (layer_nr < enforcers.size()) {
// enforcers now follow same logic as normal support. See STUDIO-3692
if (layer_nr < enforcers.size() && lower_layer) {
float no_interface_offset = std::accumulate(layer->regions().begin(), layer->regions().end(), FLT_MAX,
[](float acc, const LayerRegion* layerm) { return std::min(acc, float(layerm->flow(frExternalPerimeter).scaled_width())); });
Polygons lower_layer_polygons = (layer_nr == 0) ? Polygons() : to_polygons(lower_layer->lslices);
Polygons& enforcer = enforcers[layer_nr];
if (!enforcer.empty()) {
Polygons enforcer_polygons = diff(intersection(layer->lslices, enforcer),
// Inflate just a tiny bit to avoid intersection of the overhang areas with the object.
expand(lower_layer_polygons, 0.05f * no_interface_offset, SUPPORT_SURFACES_OFFSET_PARAMETERS));
// coconut: enforcer can't do offset2_ex, otherwise faces with angle near 90 degrees can't have enforcers, which
// is not good. For example: tails of animals needs extra support except the lowest tip.
//enforcer = std::move(offset2_ex(enforcer, -0.1 * extrusion_width_scaled, 0.1 * extrusion_width_scaled));
enforcer = offset(enforcer, 0.1 * extrusion_width_scaled);
for (const Polygon& poly : enforcer) {
enforcer_polygons = offset(enforcer_polygons, 0.1 * extrusion_width_scaled);
for (const Polygon& poly : enforcer_polygons) {
ts_layer->overhang_areas.emplace_back(poly);
ts_layer->overhang_types.emplace(&ts_layer->overhang_areas.back(), SupportLayer::Enforced);
}
}
}
if (!ts_layer->overhang_areas.empty()) has_overhangs = true;
if (!layer->cantilevers.empty()) has_cantilever = true;