From 53277714bfafb32ab7cd715547de8843fd4175eb Mon Sep 17 00:00:00 2001
From: Maxime Gimeno <maxime.gimeno@gmail.com>
Date: Tue, 16 Jul 2019 10:58:02 +0200
Subject: [PATCH] Fix c3t3_item

---
 Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp           | 9 +++++----
 .../demo/Polyhedron/Scene_item_rendering_helper.cpp      | 3 ++-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp b/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp
index 7834bca3dd6..426edfa5ef6 100644
--- a/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_c3t3_item.cpp
@@ -137,13 +137,15 @@ public :
   {
     if(is_fast)
       return;
+
     if(!alphaSlider)
     {
       alphaSlider = new QSlider(::Qt::Horizontal);
       alphaSlider->setMinimum(0);
       alphaSlider->setMaximum(255);
       alphaSlider->setValue(255);
-    }    
+    }
+    viewer->makeCurrent();
     const EPICK::Plane_3& plane = qobject_cast<Scene_c3t3_item*>(this->parent())->plane();
     float shrink_factor = qobject_cast<Scene_c3t3_item*>(this->parent())->getShrinkFactor();
     QVector4D cp(-plane.a(), -plane.b(), -plane.c(), -plane.d());
@@ -1605,10 +1607,10 @@ void Scene_c3t3_item::show_spheres(bool b)
       d->spheres->setRenderingMode(Gouraud);
       connect(d->spheres, SIGNAL(destroyed()), this, SLOT(reset_spheres()));
       connect(d->spheres, SIGNAL(on_color_changed()), this, SLOT(on_spheres_color_changed()));
+      d->computeSpheres();
+      lockChild(d->spheres);
       scene->addItem(d->spheres);
       scene->changeGroup(d->spheres, this);
-      lockChild(d->spheres);
-      d->computeSpheres();
     }
     else if (!b && d->spheres!=NULL)
     {
@@ -1644,7 +1646,6 @@ void Scene_c3t3_item::show_intersection(bool b)
         Scene_c3t3_item* ncthis = const_cast<Scene_c3t3_item*>(this);
         ncthis->d->computeIntersections(viewer);
         d->are_intersection_buffers_filled[viewer] = true;
-        ncthis->show_intersection(true);
       }
     }
     scene->addItem(d->intersection);
diff --git a/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp b/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp
index 082a79ce521..5413cd0616f 100644
--- a/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp
@@ -116,7 +116,7 @@ void Scene_item_rendering_helper::initGL(CGAL::Three::Viewer_interface* viewer)
     if(!pc->isGLInit(viewer))
       pc->initGL(viewer);
   }
-  if(!isInit(viewer))
+  if(!getBuffersFilled())
   {
     Gl_data_names flags;
     flags = (ALL);
@@ -128,6 +128,7 @@ void Scene_item_rendering_helper::initGL(CGAL::Three::Viewer_interface* viewer)
 void Scene_item_rendering_helper::processData(Gl_data_names )const
 {
   computeElements();
+  priv->are_buffers_filled = true;
 }