From 59f417f1e01d9667ffd6f7c9481b599023856d1c Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 15 Jul 2019 16:13:57 +0100
Subject: [PATCH] Added test of picking

---
 examples/osgtext3D/osgtext3D.cpp | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/examples/osgtext3D/osgtext3D.cpp b/examples/osgtext3D/osgtext3D.cpp
index 15bdbfdc2..f71be4e30 100644
--- a/examples/osgtext3D/osgtext3D.cpp
+++ b/examples/osgtext3D/osgtext3D.cpp
@@ -43,9 +43,15 @@ public:
     {
     }
 
-    virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&)
+    virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
     {
-        if (ea.getEventType() == osgGA::GUIEventAdapter::KEYUP)
+        if (ea.getEventType() == osgGA::GUIEventAdapter::PUSH)
+        {
+            osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa);
+            if (view) pick(view,ea);
+            return false;
+        }
+        else if (ea.getEventType() == osgGA::GUIEventAdapter::KEYUP)
         {
             if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Up)
             {
@@ -83,6 +89,24 @@ public:
         return false;
     }
 
+    void pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea)
+    {
+        osgUtil::LineSegmentIntersector::Intersections intersections;
+        if (view->computeIntersections(ea, intersections))
+        {
+            OSG_NOTICE<<"found intersections : "<<std::endl;
+            for(osgUtil::LineSegmentIntersector::Intersections::iterator itr = intersections.begin();
+                itr != intersections.end();
+                ++itr)
+            {
+                OSG_NOTICE<<"    intersection "<<itr->localIntersectionPoint<<std::endl;
+            }
+        }
+        else
+        {
+            OSG_NOTICE<<"failed to get intersection "<<std::endl;
+        }
+    }
 private:
     osgText::Text3D*        m_Text3D;
 };