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ENH: improve multi-material arranging 

Multi-material arranging is more compact by redefining same_color_with_previous_items:
if the colors of previous items are a subset of current object's colors, or vice versa.
Either of the two cases will not increase the total number of colors of the plate.

Jira: STUDIO-2871
Change-Id: I7cbe0835408d306084490b4849d03bb9fb617d2b
(cherry picked from commit d58702e9c0db54bcd123739298ce6dc03f5ca1a5)
This commit is contained in:
Arthur 2023-05-09 19:52:58 +08:00 committed by Lane.Wei
parent 4db1a6d46e
commit 826f27089e
1 changed files with 8 additions and 10 deletions
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18
src/libslic3r/Arrange.cpp
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@ -452,27 +452,25 @@ protected:
}
std::set<int> extruder_ids;
int non_virt_cnt = 0;
std::set<int> first_object_extruder_ids;
for (int i = 0; i < m_items.size(); i++) {
Item& p = m_items[i];
if (p.is_virt_object) continue;
extruder_ids.insert(p.extrude_ids.begin(),p.extrude_ids.end());
non_virt_cnt++;
if (non_virt_cnt == 1) { first_object_extruder_ids.insert(p.extrude_ids.begin(), p.extrude_ids.end()); }
}
extruder_ids.insert(item.extrude_ids.begin(),item.extrude_ids.end());
// add a large cost if not multi materials on same plate is not allowed
if (!params.allow_multi_materials_on_same_plate) {
bool first_object = non_virt_cnt == 0;
bool same_color_with_first_object = std::all_of(item.extrude_ids.begin(), item.extrude_ids.end(),
[&](int color) { return first_object_extruder_ids.find(color) != first_object_extruder_ids.end(); });
// non_virt_cnt==0 means it's the first object, which can be multi-color
if (!(first_object || same_color_with_first_object)) score += LARGE_COST_TO_REJECT * 1.3;
// it's the first object, which can be multi-color
bool first_object = extruder_ids.empty();
// the two objects (previously packed items and the current item) are considered having same color if either one's colors are a subset of the other
std::set<int> item_extruder_ids(item.extrude_ids.begin(), item.extrude_ids.end());
bool same_color_with_previous_items = std::includes(item_extruder_ids.begin(), item_extruder_ids.end(), extruder_ids.begin(), extruder_ids.end())
|| std::includes(extruder_ids.begin(), extruder_ids.end(), item_extruder_ids.begin(), item_extruder_ids.end());
if (!(first_object || same_color_with_previous_items)) score += LARGE_COST_TO_REJECT * 1.3;
}
// for layered printing, we want extruder change as few as possible
// this has very weak effect, CAN NOT use a large weight
extruder_ids.insert(item.extrude_ids.begin(), item.extrude_ids.end());
if (!params.is_seq_print) {
score += 1 * std::max(0, ((int) extruder_ids.size() - 1));
}