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Fix crash when slicing multi-material print with wipe tower (#12682)

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The WipeTower2 code path never called construct_mesh(), leaving
wipe_tower_mesh_data as std::nullopt. GCode export then dereferenced
it unconditionally, triggering an assertion failure / crash.
This commit is contained in:
SoftFever
2026-03-09 13:31:11 +08:00
committed by GitHub
parent 4f8097f7f7
commit eb6da907a9
4 changed files with 9 additions and 1 deletions
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2
src/libslic3r/GCode.cpp
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@@ -3025,7 +3025,7 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
}
}
// wipe tower area
if (has_wipe_tower) {
if (has_wipe_tower && print.wipe_tower_data().wipe_tower_mesh_data) {
Polygon temp_Expoly = print.wipe_tower_data().wipe_tower_mesh_data->bottom;
area_sum_temp += temp_Expoly.area();
}

2
src/libslic3r/GCode/WipeTower2.hpp
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@@ -72,6 +72,8 @@ public:
// WT2 doesn't currently compute a rib-origin compensation like WipeTower (m_rib_offset),
// so expose a zero offset for consistency purposes (to maintain API parity).
Vec2f get_rib_offset() const { return Vec2f::Zero(); }
float get_rib_width() const { return m_rib_width; }
float get_rib_length() const { return m_rib_length; }
// Switch to a next layer.
void set_layer(

5
src/libslic3r/Print.cpp
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@@ -3396,6 +3396,11 @@ void Print::_make_wipe_tower()
m_wipe_tower_data.used_filament = wipe_tower.get_used_filament();
m_wipe_tower_data.number_of_toolchanges = wipe_tower.get_number_of_toolchanges();
m_wipe_tower_data.construct_mesh(wipe_tower.width(), wipe_tower.get_depth(),
wipe_tower.get_wipe_tower_height(), wipe_tower.get_brim_width(),
config().wipe_tower_wall_type.value == WipeTowerWallType::wtwRib,
wipe_tower.get_rib_width(), wipe_tower.get_rib_length(),
config().wipe_tower_fillet_wall.value);
const Vec3d origin = Vec3d::Zero();
m_fake_wipe_tower.set_fake_extrusion_data(wipe_tower.position(), wipe_tower.width(), wipe_tower.get_wipe_tower_height(),
config().initial_layer_print_height, m_wipe_tower_data.depth,

1
src/libslic3r/Print.hpp
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@@ -770,6 +770,7 @@ struct WipeTowerData
number_of_toolchanges = -1;
depth = 0.f;
brim_width = 0.f;
rib_offset = Vec2f::Zero();
wipe_tower_mesh_data = std::nullopt;
}
void construct_mesh(float width, float depth, float height, float brim_width, bool is_rib_wipe_tower, float rib_width, float rib_length, bool fillet_wall);