Fix compound scaling from commit 8cc345 (that tries to fix fix 37838be)

supermerill/SuperSlicer#1891
supermerill/SuperSlicer#66

1 files changed, 4 insertions, 3 deletions

diff --git a/src/libslic3r/ClipperUtils.cpp b/src/libslic3r/ClipperUtils.cpp
index cc91ce050..431c4ed0f 100644
--- a/src/libslic3r/ClipperUtils.cpp
+++ b/src/libslic3r/ClipperUtils.cpp
@@ -598,6 +598,10 @@ ClipperLib::PolyTree _clipper_do_pl(const ClipperLib::ClipType clipType, const P
     // read input
     ClipperLib::Paths input_subject = Slic3rMultiPoints_to_ClipperPaths(subject);
     ClipperLib::Paths input_clip    = Slic3rMultiPoints_to_ClipperPaths(clip);
+
+    // perform safety offset (before scaling because it scale & unscale)
+    if (safety_offset_) safety_offset(&input_clip);
+
     //scale to have some more precision to do some Y-bugfix
     scaleClipperPolygons(input_subject);
     scaleClipperPolygons(input_clip);
@@ -614,9 +618,6 @@ ClipperLib::PolyTree _clipper_do_pl(const ClipperLib::ClipType clipType, const P
                 lasty = pt.Y;
             }
         }
-
-    // perform safety offset
-    if (safety_offset_) safety_offset(&input_clip);
     
     // init Clipper
     ClipperLib::Clipper clipper;