From 5f04066ac0ea2ad1b9aeeb63c57bc69ec2f02dea Mon Sep 17 00:00:00 2001
From: "zhimin.zeng" <zhimin.zeng@bambulab.com>
Date: Wed, 14 Jun 2023 18:39:06 +0800
Subject: [PATCH] FIX: first layer slice color is not correct

STUDIO-3187

Change-Id: Ic3d3fa6746a339a58494634b576538fcd34d6f80
---
 src/libslic3r/PrintObjectSlice.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/libslic3r/PrintObjectSlice.cpp b/src/libslic3r/PrintObjectSlice.cpp
index 341b185f3..db4d9f33b 100644
--- a/src/libslic3r/PrintObjectSlice.cpp
+++ b/src/libslic3r/PrintObjectSlice.cpp
@@ -1149,8 +1149,7 @@ void PrintObject::slice_volumes()
                             //BBS: trim surfaces
                             for (size_t region_id = 0; region_id < layer->regions().size(); ++region_id) {
                                 // BBS: split trimming result by region
-                                Polygons contour_exp;
-                                for (Surface surface : layer->regions()[region_id]->slices.surfaces) contour_exp.push_back(surface.expolygon.contour);
+                                ExPolygons contour_exp = to_expolygons(std::move(layer->regions()[region_id]->slices.surfaces));
 
                                 layer->regions()[region_id]->slices.set(intersection_ex(contour_exp, to_polygons(trimming)), stInternal);
                             }