Changeset 347 for trunk/avango-osg/python/avango/osg/OSGNode.cpp

Timestamp:

03/12/10 09:55:04 (2 years ago)

Author:

ddangelo

Message:

Python function to calculate the bounding box of a av::osg::Node added.
The LoadFile? node now outputs the filename of the loaded object in the field "FilenameLoaded?", as soon as the file is actually loaded. This is useful to trigger actions which depend on the presence of the loaded object (e.g. the calculation of the bounding box).

File:

• trunk/avango-osg/python/avango/osg/OSGNode.cpp (modified) (3 diffs)

trunk/avango-osg/python/avango/osg/OSGNode.cpp

@@ -29 +29 @@
 #include "OSGNode.h"
 
+#include <osg/NodeVisitor>
+#include <osg/BoundingBox>
+#include <osg/BoundingSphere>
+#include <osg/MatrixTransform>
+#include <osg/Billboard>
+
+
 using namespace boost::python;
 using namespace av::python;
@@ -43 +50 @@
  }
 
+
+namespace {
+  class CalculateBoundingBox : public ::osg::NodeVisitor
+  {
+  public:
+    CalculateBoundingBox() :
+      NodeVisitor(NodeVisitor::TRAVERSE_ALL_CHILDREN)
+    {
+      m_transformMatrix.makeIdentity();
+    }
+
+    virtual ~CalculateBoundingBox()
+    {
+    }
+
+    virtual
+    void apply(::osg::Geode &geode)
+    {
+      ::osg::BoundingBox bbox;
+      for (unsigned int i = 0; i < geode.getNumDrawables(); ++i)
+      {
+        bbox.expandBy(geode.getDrawable(i)->getBound());
+      }
+      ::osg::BoundingBox bboxTrans;
+      for (unsigned int i = 0; i < 8; ++i)
+      {
+        ::osg::Vec3 xvec = bbox.corner(i) * m_transformMatrix;
+        bboxTrans.expandBy(xvec);
+      }
+      m_boundingBox.expandBy(bboxTrans);
+      traverse(geode);
+    }
+
+    virtual
+    void apply(::osg::MatrixTransform &node)
+    {
+      m_transformMatrix *= node.getMatrix();
+      traverse(node);
+    }
+
+    virtual
+    void apply(::osg::Billboard &node)
+    {
+      traverse(node);
+    }
+
+    ::osg::BoundingBox &getBoundBox()
+    {
+      return m_boundingBox;
+    }
+
+  protected:
+    ::osg::BoundingBox m_boundingBox; // the overall resultant bounding box
+    ::osg::Matrix m_transformMatrix; // the current transform matrix
+  };
+
+
+  osg::BoundingBox CalcBoundingBox(av::osg::Node* node)
+  {
+    CalculateBoundingBox bbox;
+    node->getOsgNode()->accept( bbox );
+    return bbox.getBoundBox();
+  }
+
+}
+
+
+
+
 void init_OSGNode(void)
  {
@@ -52 +128 @@
     .def("get_absolute_transform", &av::osg::Node::getAbsoluteTransform)
     ;
+
+  def("calc_bounding_box", CalcBoundingBox);
  }