From 7d2038eefba883c4b30db6048bd60f33c1db2e2c Mon Sep 17 00:00:00 2001
From: Filip Sykala - NTB T15p <Filip.Sykala@Prusa3D.cz>
Date: Tue, 26 Sep 2023 13:34:12 +0200
Subject: [PATCH] Fix rotation of mirrored volume(object) Text + SVG Issue
 SPE-1924

---
 src/slic3r/GUI/SurfaceDrag.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/slic3r/GUI/SurfaceDrag.cpp b/src/slic3r/GUI/SurfaceDrag.cpp
index c15e17a590..0730811c65 100644
--- a/src/slic3r/GUI/SurfaceDrag.cpp
+++ b/src/slic3r/GUI/SurfaceDrag.cpp
@@ -341,6 +341,25 @@ void do_local_z_rotate(GLCanvas3D &canvas, double relative_angle)
     assert(selection.is_single_full_object() || selection.is_single_volume());
     if (!selection.is_single_full_object() && !selection.is_single_volume()) return;
 
+    // Fix angle for mirrored volume
+    bool is_mirrored = false;
+    const GLVolume* gl_volume = selection.get_first_volume();
+    if (gl_volume != nullptr) {
+        if (selection.is_single_full_object()) {
+            const ModelInstance *instance = get_model_instance(*gl_volume, selection.get_model()->objects);
+            if (instance != nullptr)
+                is_mirrored = has_reflection(instance->get_matrix());
+        } else {
+            // selection.is_single_volume()
+            const ModelVolume *volume = get_model_volume(*gl_volume, selection.get_model()->objects);
+            if (volume != nullptr)
+                is_mirrored = has_reflection(volume->get_matrix());
+        }    
+    }
+    if (is_mirrored)
+        relative_angle *= -1;
+
+
     selection.setup_cache();
 
     auto selection_rotate_fnc = [&selection, &relative_angle](){