8 files changed, 30 insertions, 0 deletions
diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index f5ef10e9c..f4ba05bdb 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -206,6 +206,8 @@ sub new {
             Slic3r::GUI::_3DScene::set_active($self->{canvas3D}, 0);
             Slic3r::GUI::_3DScene::enable_legend_texture($self->{preview3D}->canvas, 1);
             $self->{preview3D}->load_print(1);
+            # sets the canvas as dirty to force a render at the 1st idle event (wxWidgets IsShownOnScreen() is buggy and cannot be used reliably)
+            Slic3r::GUI::_3DScene::set_as_dirty($self->{preview3D}->canvas);
         } else {
             Slic3r::GUI::_3DScene::enable_legend_texture($self->{preview3D}->canvas, 0);
         }
@@ -218,6 +220,8 @@ sub new {
                 Slic3r::GUI::_3DScene::set_objects_selections($self->{canvas3D}, \@$selections);
                 Slic3r::GUI::_3DScene::reload_scene($self->{canvas3D}, 1);
             }            
+            # sets the canvas as dirty to force a render at the 1st idle event (wxWidgets IsShownOnScreen() is buggy and cannot be used reliably)
+            Slic3r::GUI::_3DScene::set_as_dirty($self->{canvas3D});
         } else {
             $preview->OnActivate if $preview->can('OnActivate');        
         }
diff --git a/xs/src/slic3r/GUI/3DScene.cpp b/xs/src/slic3r/GUI/3DScene.cpp
index 1879b3082..a2a310f3c 100644
--- a/xs/src/slic3r/GUI/3DScene.cpp
+++ b/xs/src/slic3r/GUI/3DScene.cpp
@@ -1758,6 +1758,11 @@ void _3DScene::set_active(wxGLCanvas* canvas, bool active)
     s_canvas_mgr.set_active(canvas, active);
 }
 
+void _3DScene::set_as_dirty(wxGLCanvas* canvas)
+{
+    s_canvas_mgr.set_as_dirty(canvas);
+}
+
 unsigned int _3DScene::get_volumes_count(wxGLCanvas* canvas)
 {
     return s_canvas_mgr.get_volumes_count(canvas);
diff --git a/xs/src/slic3r/GUI/3DScene.hpp b/xs/src/slic3r/GUI/3DScene.hpp
index c6a166397..c317dba24 100644
--- a/xs/src/slic3r/GUI/3DScene.hpp
+++ b/xs/src/slic3r/GUI/3DScene.hpp
@@ -517,6 +517,7 @@ public:
     static bool init(wxGLCanvas* canvas);
 
     static void set_active(wxGLCanvas* canvas, bool active);
+    static void set_as_dirty(wxGLCanvas* canvas);
 
     static unsigned int get_volumes_count(wxGLCanvas* canvas);
     static void reset_volumes(wxGLCanvas* canvas);
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.cpp b/xs/src/slic3r/GUI/GLCanvas3D.cpp
index d3153bdb4..6f23af5a3 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1536,6 +1536,11 @@ void GLCanvas3D::set_active(bool active)
     m_active = active;
 }
 
+void GLCanvas3D::set_as_dirty()
+{
+    m_dirty = true;
+}
+
 unsigned int GLCanvas3D::get_volumes_count() const
 {
     return (unsigned int)m_volumes.volumes.size();
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.hpp b/xs/src/slic3r/GUI/GLCanvas3D.hpp
index c503d1845..18011f497 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.hpp
@@ -452,6 +452,7 @@ public:
     bool set_current();
 
     void set_active(bool active);
+    void set_as_dirty();
 
     unsigned int get_volumes_count() const;
     void reset_volumes();
diff --git a/xs/src/slic3r/GUI/GLCanvas3DManager.cpp b/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
index bdca73854..81efe4408 100644
--- a/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
@@ -219,6 +219,13 @@ void GLCanvas3DManager::set_active(wxGLCanvas* canvas, bool active)
         it->second->set_active(active);
 }
 
+void GLCanvas3DManager::set_as_dirty(wxGLCanvas* canvas)
+{
+    CanvasesMap::iterator it = _get_canvas(canvas);
+    if (it != m_canvases.end())
+        it->second->set_as_dirty();
+}
+
 unsigned int GLCanvas3DManager::get_volumes_count(wxGLCanvas* canvas) const
 {
     CanvasesMap::const_iterator it = _get_canvas(canvas);
diff --git a/xs/src/slic3r/GUI/GLCanvas3DManager.hpp b/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
index 3092925d3..8726eb0b1 100644
--- a/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
+++ b/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
@@ -70,6 +70,7 @@ public:
     bool init(wxGLCanvas* canvas);
 
     void set_active(wxGLCanvas* canvas, bool active);
+    void set_as_dirty(wxGLCanvas* canvas);
 
     unsigned int get_volumes_count(wxGLCanvas* canvas) const;
     void reset_volumes(wxGLCanvas* canvas);
diff --git a/xs/xsp/GUI_3DScene.xsp b/xs/xsp/GUI_3DScene.xsp
index 29f35293b..d46c06120 100644
--- a/xs/xsp/GUI_3DScene.xsp
+++ b/xs/xsp/GUI_3DScene.xsp
@@ -197,6 +197,12 @@ set_active(canvas, active)
     CODE:
         _3DScene::set_active((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"), active);
 
+void
+set_as_dirty(canvas)
+        SV *canvas;
+    CODE:
+        _3DScene::set_as_dirty((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"));
+
 unsigned int
 get_volumes_count(canvas)
         SV *canvas;