From 6244510b2550c8d0eacccb9f0642dc61204e05a1 Mon Sep 17 00:00:00 2001
From: Ian Bassi <ian.bassi@outlook.com>
Date: Mon, 20 Apr 2026 19:18:03 -0300
Subject: [PATCH] Fallback to per-move validation when bbox outside (#13179)

---
 src/libslic3r/BuildVolume.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/libslic3r/BuildVolume.cpp b/src/libslic3r/BuildVolume.cpp
index 3802fbc014..1ac200d9c8 100644
--- a/src/libslic3r/BuildVolume.cpp
+++ b/src/libslic3r/BuildVolume.cpp
@@ -527,7 +527,16 @@ bool BuildVolume::all_paths_inside(const GCodeProcessorResult& paths, const Boun
             build_volume.max.z() = std::numeric_limits<double>::max();
         if (ignore_bottom)
             build_volume.min.z() = -std::numeric_limits<double>::max();
-        return build_volume.contains(paths_bbox);
+        // BBox-only callers may provide no moves. Validate bbox corners regardless of paths_bbox.defined.
+        if (paths.moves.empty())
+            return build_volume.contains(paths_bbox.min) && build_volume.contains(paths_bbox.max);
+        if (paths_bbox.defined && build_volume.contains(paths_bbox))
+            return true;
+
+        // Fallback: validate only relevant extrusion moves.
+        const BoundingBox3Base<Vec3f> build_volumef(build_volume.min.cast<float>(), build_volume.max.cast<float>());
+        return std::all_of(paths.moves.begin(), paths.moves.end(), [move_valid, build_volumef](const GCodeProcessorResult::MoveVertex &move)
+            { return !move_valid(move) || build_volumef.contains(move.position); });
     }
     case BuildVolume_Type::Circle:
     {