From 160b0ea7d90416e7704f314f5ee300f6f3b79ca8 Mon Sep 17 00:00:00 2001
From: frohlich <frohlich>
Date: Mon, 20 Nov 2006 18:17:56 +0000
Subject: [PATCH] Modified Files: 	placementtrans.cxx placementtrans.hxx:
 Make use of that view         information in the update visitor

---
 simgear/scene/model/placementtrans.cxx | 27 ++++++++++++++++++++++++++
 simgear/scene/model/placementtrans.hxx |  7 +++++--
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/simgear/scene/model/placementtrans.cxx b/simgear/scene/model/placementtrans.cxx
index 960b37cc..73011b2f 100644
--- a/simgear/scene/model/placementtrans.cxx
+++ b/simgear/scene/model/placementtrans.cxx
@@ -32,6 +32,32 @@
 
 #include "placementtrans.hxx"
 
+#include <simgear/scene/util/SGUpdateVisitor.hxx>
+
+class SGPlacementTransform::UpdateCallback : public osg::NodeCallback {
+public:
+  virtual void operator()(osg::Node* node, osg::NodeVisitor* nv)
+  {
+    // short circuit updates if the model we place with that branch
+    // out of sight.
+    // Note that the transform is still correct.
+    SGUpdateVisitor* updateVisitor = dynamic_cast<SGUpdateVisitor*>(nv);
+    if (updateVisitor) {
+      SGPlacementTransform* placementTransform;
+      placementTransform = static_cast<SGPlacementTransform*>(node);
+      double dist2 = distSqr(updateVisitor->getGlobalEyePos(),
+                             placementTransform->getGlobalPos());
+      if (updateVisitor->getSqrVisibility() < dist2)
+        return;
+    }
+    // note, callback is responsible for scenegraph traversal so
+    // should always include call traverse(node,nv) to ensure 
+    // that the rest of cullbacks and the scene graph are traversed.
+    traverse(node, nv);
+  }
+};
+
+
 SGPlacementTransform::SGPlacementTransform(void) :
   _placement_offset(0, 0, 0),
   _scenery_center(0, 0, 0),
@@ -40,6 +66,7 @@ SGPlacementTransform::SGPlacementTransform(void) :
             0, 0, 1, 0,
             0, 0, 0, 1)
 {
+  setUpdateCallback(new UpdateCallback);
 }
 
 SGPlacementTransform::~SGPlacementTransform(void)
diff --git a/simgear/scene/model/placementtrans.hxx b/simgear/scene/model/placementtrans.hxx
index c72fbaba..93ca1080 100644
--- a/simgear/scene/model/placementtrans.hxx
+++ b/simgear/scene/model/placementtrans.hxx
@@ -40,8 +40,6 @@ public:
   SGPlacementTransform(void);
   virtual ~SGPlacementTransform(void);
 
-public:
-
   void setTransform(const SGVec3d& off)
   { _placement_offset = off; dirtyBound(); }
   void setTransform(const SGVec3d& off, const SGMatrixd& rot)
@@ -49,11 +47,16 @@ public:
   void setSceneryCenter(const SGVec3d& center)
   { _scenery_center = center; dirtyBound(); }
 
+  const SGVec3d& getGlobalPos() const
+  { return _placement_offset; }
+
   virtual bool computeLocalToWorldMatrix(osg::Matrix&,osg::NodeVisitor*) const;
   virtual bool computeWorldToLocalMatrix(osg::Matrix&,osg::NodeVisitor*) const;
 
 private:
 
+  class UpdateCallback;
+
   //////////////////////////////////////////////////////////////////
   // private data                                                 //
   //////////////////////////////////////////////////////////////////
-- 
2.39.5