ENH: add arachne engine for narrow internal solid infill

ConcentricGapFill pattern was used for internal narrow solid infill. Use arachne engine instead to remove gap fill inside the pattern and improve the extrusion path Signed-off-by: salt.wei <salt.wei@bambulab.com> Change-Id: I758d7c72eb71cc37026b7cebf746cc345014c3f5 (cherry picked from commit 0b6bacd21a091afc13d7b36a69e5b10f155bc6f8)
2026-09-27 02:41:17 +00:00 · 2022-08-26 09:25:59 +08:00
parent cbefb77de3
commit aab8a12801
54 changed files with 7922 additions and 30 deletions
@@ -0,0 +1,126 @@
+//Copyright (c) 2022 Ultimaker B.V.
+//CuraEngine is released under the terms of the AGPLv3 or higher.
+
+#include <cassert>
+#include <boost/log/trivial.hpp>
+
+#include "LimitedBeadingStrategy.hpp"
+#include "Point.hpp"
+
+namespace Slic3r::Arachne
+{
+
+std::string LimitedBeadingStrategy::toString() const
+{
+    return std::string("LimitedBeadingStrategy+") + parent->toString();
+}
+
+coord_t LimitedBeadingStrategy::getTransitioningLength(coord_t lower_bead_count) const
+{
+    return parent->getTransitioningLength(lower_bead_count);
+}
+
+float LimitedBeadingStrategy::getTransitionAnchorPos(coord_t lower_bead_count) const
+{
+    return parent->getTransitionAnchorPos(lower_bead_count);
+}
+
+LimitedBeadingStrategy::LimitedBeadingStrategy(const coord_t max_bead_count, BeadingStrategyPtr parent)
+    : BeadingStrategy(*parent)
+    , max_bead_count(max_bead_count)
+    , parent(std::move(parent))
+{
+    if (max_bead_count % 2 == 1)
+    {
+        BOOST_LOG_TRIVIAL(warning) << "LimitedBeadingStrategy with odd bead count is odd indeed!";
+    }
+}
+
+LimitedBeadingStrategy::Beading LimitedBeadingStrategy::compute(coord_t thickness, coord_t bead_count) const
+{
+    if (bead_count <= max_bead_count)
+    {
+        Beading ret = parent->compute(thickness, bead_count);
+        bead_count = ret.toolpath_locations.size();
+
+        if (bead_count % 2 == 0 && bead_count == max_bead_count)
+        {
+            const coord_t innermost_toolpath_location = ret.toolpath_locations[max_bead_count / 2 - 1];
+            const coord_t innermost_toolpath_width = ret.bead_widths[max_bead_count / 2 - 1];
+            ret.toolpath_locations.insert(ret.toolpath_locations.begin() + max_bead_count / 2, innermost_toolpath_location + innermost_toolpath_width / 2);
+            ret.bead_widths.insert(ret.bead_widths.begin() + max_bead_count / 2, 0);
+        }
+        return ret;
+    }
+    assert(bead_count == max_bead_count + 1);
+    if(bead_count != max_bead_count + 1)
+    {
+        BOOST_LOG_TRIVIAL(warning) << "Too many beads! " << bead_count << " != " << max_bead_count + 1;
+    }
+
+    coord_t optimal_thickness = parent->getOptimalThickness(max_bead_count);
+    Beading ret = parent->compute(optimal_thickness, max_bead_count);
+    bead_count = ret.toolpath_locations.size();
+    ret.left_over += thickness - ret.total_thickness;
+    ret.total_thickness = thickness;
+    
+    // Enforce symmetry
+    if (bead_count % 2 == 1) {
+        ret.toolpath_locations[bead_count / 2] = thickness / 2;
+        ret.bead_widths[bead_count / 2] = thickness - optimal_thickness;
+    }
+    for (coord_t bead_idx = 0; bead_idx < (bead_count + 1) / 2; bead_idx++)
+        ret.toolpath_locations[bead_count - 1 - bead_idx] = thickness - ret.toolpath_locations[bead_idx];
+
+    //Create a "fake" inner wall with 0 width to indicate the edge of the walled area.
+    //This wall can then be used by other structures to e.g. fill the infill area adjacent to the variable-width walls.
+    coord_t innermost_toolpath_location = ret.toolpath_locations[max_bead_count / 2 - 1];
+    coord_t innermost_toolpath_width = ret.bead_widths[max_bead_count / 2 - 1];
+    ret.toolpath_locations.insert(ret.toolpath_locations.begin() + max_bead_count / 2, innermost_toolpath_location + innermost_toolpath_width / 2);
+    ret.bead_widths.insert(ret.bead_widths.begin() + max_bead_count / 2, 0);
+
+    //Symmetry on both sides. Symmetry is guaranteed since this code is stopped early if the bead_count <= max_bead_count, and never reaches this point then.
+    const size_t opposite_bead = bead_count - (max_bead_count / 2 - 1);
+    innermost_toolpath_location = ret.toolpath_locations[opposite_bead];
+    innermost_toolpath_width = ret.bead_widths[opposite_bead];
+    ret.toolpath_locations.insert(ret.toolpath_locations.begin() + opposite_bead, innermost_toolpath_location - innermost_toolpath_width / 2);
+    ret.bead_widths.insert(ret.bead_widths.begin() + opposite_bead, 0);
+
+    return ret;
+}
+
+coord_t LimitedBeadingStrategy::getOptimalThickness(coord_t bead_count) const
+{
+    if (bead_count <= max_bead_count)
+        return parent->getOptimalThickness(bead_count);
+    assert(false);
+    return scaled<coord_t>(1000.); // 1 meter (Cura was returning 10 meter)
+}
+
+coord_t LimitedBeadingStrategy::getTransitionThickness(coord_t lower_bead_count) const
+{
+    if (lower_bead_count < max_bead_count)
+        return parent->getTransitionThickness(lower_bead_count);
+
+    if (lower_bead_count == max_bead_count)
+        return parent->getOptimalThickness(lower_bead_count + 1) - scaled<coord_t>(0.01);
+
+    assert(false);
+    return scaled<coord_t>(900.); // 0.9 meter;
+}
+
+coord_t LimitedBeadingStrategy::getOptimalBeadCount(coord_t thickness) const
+{
+    coord_t parent_bead_count = parent->getOptimalBeadCount(thickness);
+    if (parent_bead_count <= max_bead_count) {
+        return parent->getOptimalBeadCount(thickness);
+    } else if (parent_bead_count == max_bead_count + 1) {
+        if (thickness < parent->getOptimalThickness(max_bead_count + 1) - scaled<coord_t>(0.01))
+            return max_bead_count;
+        else 
+            return max_bead_count + 1;
+    }
+    else return max_bead_count + 1;
+}
+
+} // namespace Slic3r::Arachne