Check for existence of gcode toolpaths that can be exported to obj file

src/slic3r/GUI/3DScene.cpp

@@ -853,11 +853,39 @@ std::string GLVolumeCollection::log_memory_info() const
 	return " (GLVolumeCollection RAM: " + format_memsize_MB(this->cpu_memory_used()) + " GPU: " + format_memsize_MB(this->gpu_memory_used()) + " Both: " + format_memsize_MB(this->gpu_memory_used()) + ")";
 }
 
+bool can_export_to_obj(const GLVolume& volume)
+{
+    if (!volume.is_active || !volume.is_extrusion_path)
+        return false;
+
+    if (volume.indexed_vertex_array.triangle_indices.empty() && (std::min(volume.indexed_vertex_array.triangle_indices_size, volume.tverts_range.second - volume.tverts_range.first) == 0))
+        return false;
+
+    if (volume.indexed_vertex_array.quad_indices.empty() && (std::min(volume.indexed_vertex_array.quad_indices_size, volume.qverts_range.second - volume.qverts_range.first) == 0))
+        return false;
+
+    return true;
+}
+
+bool GLVolumeCollection::has_toolpaths_to_export() const
+{
+    for (const GLVolume* volume : this->volumes)
+    {
+        if (can_export_to_obj(*volume))
+            return true;
+    }
+
+    return false;
+}
+
 void GLVolumeCollection::export_toolpaths_to_obj(const char* filename) const
 {
     if (filename == nullptr)
         return;
 
+    if (!has_toolpaths_to_export())
+        return;
+
     FILE* fp = boost::nowide::fopen(filename, "w");
     if (fp == nullptr) {
         BOOST_LOG_TRIVIAL(error) << "GLVolumeCollection::export_toolpaths_to_obj: Couldn't open " << filename << " for writing";
@@ -868,11 +896,11 @@ void GLVolumeCollection::export_toolpaths_to_obj(const char* filename) const
     fprintf(fp, "# Generated by %s based on Slic3r\n\n", SLIC3R_BUILD_ID);
 
     unsigned int vertices_count = 0;
-    unsigned int volume_count = 0;
+    unsigned int volumes_count = 0;
 
     for (const GLVolume* volume : this->volumes)
     {
-        if (!volume->is_active || !volume->is_extrusion_path)
+        if (!can_export_to_obj(*volume))
             continue;
 
         std::vector<float> vertices_and_normals_interleaved;
@@ -925,19 +953,19 @@ void GLVolumeCollection::export_toolpaths_to_obj(const char* filename) const
         if (triangle_indices.empty() && quad_indices.empty())
             continue;
 
-        fprintf(fp, "\n# vertices volume %d\n", volume_count);
+        fprintf(fp, "\n# vertices volume %d\n", volumes_count);
         for (unsigned int i = 0; i < vertices_and_normals_interleaved.size(); i += 6)
         {
             fprintf(fp, "v %f %f %f\n", vertices_and_normals_interleaved[i + 3], vertices_and_normals_interleaved[i + 4], vertices_and_normals_interleaved[i + 5]);
         }
 
-        fprintf(fp, "\n# normals volume %d\n", volume_count);
+        fprintf(fp, "\n# normals volume %d\n", volumes_count);
         for (unsigned int i = 0; i < vertices_and_normals_interleaved.size(); i += 6)
         {
             fprintf(fp, "vn %f %f %f\n", vertices_and_normals_interleaved[i + 0], vertices_and_normals_interleaved[i + 1], vertices_and_normals_interleaved[i + 2]);
         }
 
-        fprintf(fp, "\n# triangular facets volume %d\n", volume_count);
+        fprintf(fp, "\n# triangular facets volume %d\n", volumes_count);
         for (unsigned int i = 0; i < triangle_indices.size(); i += 3)
         {
             int id_v1 = vertices_count + 1 + triangle_indices[i + 0];
@@ -946,7 +974,7 @@ void GLVolumeCollection::export_toolpaths_to_obj(const char* filename) const
             fprintf(fp, "f %d//%d %d//%d %d//%d\n", id_v1, id_v1, id_v2, id_v2, id_v3, id_v3);
         }
 
-        fprintf(fp, "\n# quadrangular facets volume %d\n", volume_count);
+        fprintf(fp, "\n# quadrangular facets volume %d\n", volumes_count);
         for (unsigned int i = 0; i < quad_indices.size(); i += 4)
         {
             int id_v1 = vertices_count + 1 + quad_indices[i + 0];
@@ -956,7 +984,7 @@ void GLVolumeCollection::export_toolpaths_to_obj(const char* filename) const
             fprintf(fp, "f %d//%d %d//%d %d//%d %d//%d\n", id_v1, id_v1, id_v2, id_v2, id_v3, id_v3, id_v4, id_v4);
         }
 
-        ++volume_count;
+        ++volumes_count;
         vertices_count += vertices_and_normals_interleaved.size() / 6;
     }
 

src/slic3r/GUI/3DScene.hpp

@@ -564,6 +564,7 @@ public:
     // Return CPU, GPU and total memory log line.
     std::string         log_memory_info() const;
 
+    bool                has_toolpaths_to_export() const;
     // Export the geometry of the GLVolumes toolpaths of this collection into the file with the given path, in obj format 
     void                export_toolpaths_to_obj(const char* filename) const;
 

src/slic3r/GUI/GLCanvas3D.cpp

@@ -3403,6 +3403,11 @@ void GLCanvas3D::msw_rescale()
     m_warning_texture.msw_rescale(*this);
 }
 
+bool GLCanvas3D::has_toolpaths_to_export() const
+{
+    return m_volumes.has_toolpaths_to_export();
+}
+
 void GLCanvas3D::export_toolpaths_to_obj(const char* filename) const
 {
     m_volumes.export_toolpaths_to_obj(filename);

src/slic3r/GUI/GLCanvas3D.hpp

@@ -644,6 +644,7 @@ public:
     void get_undoredo_toolbar_additional_tooltip(unsigned int item_id, std::string& text) { return m_undoredo_toolbar.get_additional_tooltip(item_id, text); }
     void set_undoredo_toolbar_additional_tooltip(unsigned int item_id, const std::string& text) { m_undoredo_toolbar.set_additional_tooltip(item_id, text); }
 
+    bool has_toolpaths_to_export() const;
     void export_toolpaths_to_obj(const char* filename) const;
 
 private:

src/slic3r/GUI/MainFrame.cpp

@@ -247,7 +247,7 @@ bool MainFrame::can_export_model() const
 
 bool MainFrame::can_export_toolpaths() const
 {
-    return (m_plater != nullptr) && (m_plater->printer_technology() == ptFFF) && m_plater->is_preview_shown() && m_plater->is_preview_loaded();
+    return (m_plater != nullptr) && (m_plater->printer_technology() == ptFFF) && m_plater->is_preview_shown() && m_plater->is_preview_loaded() && m_plater->has_toolpaths_to_export();
 }
 
 bool MainFrame::can_export_supports() const

src/slic3r/GUI/Plater.cpp

@@ -4434,7 +4434,12 @@ void Plater::export_3mf(const boost::filesystem::path& output_path)
     }
 }
 
-void Plater::export_toolpaths_to_obj()
+bool Plater::has_toolpaths_to_export() const
+{
+    return  p->preview->get_canvas3d()->has_toolpaths_to_export();
+}
+
+void Plater::export_toolpaths_to_obj() const
 {
     if ((printer_technology() != ptFFF) || !is_preview_loaded())
         return;
@@ -4444,7 +4449,6 @@ void Plater::export_toolpaths_to_obj()
         return;
     
     wxBusyCursor wait;
-
     p->preview->get_canvas3d()->export_toolpaths_to_obj(into_u8(path).c_str());
 }
 

src/slic3r/GUI/Plater.hpp

@@ -183,7 +183,8 @@ public:
     void export_stl(bool extended = false, bool selection_only = false);
     void export_amf();
     void export_3mf(const boost::filesystem::path& output_path = boost::filesystem::path());
-    void export_toolpaths_to_obj();
+    bool has_toolpaths_to_export() const;
+    void export_toolpaths_to_obj() const;
     void reslice();
     void reslice_SLA_supports(const ModelObject &object);
     void changed_object(int obj_idx);