From fc929d9faf02aa2743357a029b0330b967cc732c Mon Sep 17 00:00:00 2001
From: enricoturri1966 <enricoturri@seznam.cz>
Date: Mon, 12 Dec 2022 11:14:38 +0100
Subject: [PATCH] Fixed assert in creation of model for sinking contours
 rendering when vertices count is zero

---
 src/slic3r/GUI/3DScene.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/slic3r/GUI/3DScene.cpp b/src/slic3r/GUI/3DScene.cpp
index c858d5559c..d83890a40c 100644
--- a/src/slic3r/GUI/3DScene.cpp
+++ b/src/slic3r/GUI/3DScene.cpp
@@ -127,7 +127,9 @@ void GLVolume::SinkingContours::update()
                 init_data.add_triangle(vertices_counter - 3, vertices_counter - 2, vertices_counter - 1);
         }
     }
-    m_model.init_from(std::move(init_data));
+
+    if (init_data.vertices_count() > 0)
+      m_model.init_from(std::move(init_data));
 }
 
 void GLVolume::NonManifoldEdges::render()