Added new osg::ComputeBoundsVisitor

src/osg/ComputeBoundsVisitor.cpp

@@ -0,0 +1,97 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osg/ComputeBoundsVisitor>
+#include <osg/Transform>
+#include <osg/Drawable>
+#include <osg/Geode>
+
+using namespace osg;
+
+ComputeBoundsVisitor::ComputeBoundsVisitor(TraversalMode traversalMode):
+    osg::NodeVisitor(traversalMode)
+{
+}
+
+void ComputeBoundsVisitor::reset()
+{
+    _matrixStack.clear();
+    _bb.init();
+}
+
+void ComputeBoundsVisitor::getPolytope(osg::Polytope& polytope, float margin) const
+{
+    float delta = _bb.radius()*margin;
+    polytope.add( osg::Plane(0.0, 0.0, 1.0, -(_bb.zMin()-delta)) );
+    polytope.add( osg::Plane(0.0, 0.0, -1.0, (_bb.zMax()+delta)) );
+
+    polytope.add( osg::Plane(1.0, 0.0, 0.0, -(_bb.xMin()-delta)) );
+    polytope.add( osg::Plane(-1.0, 0.0, 0.0, (_bb.xMax()+delta)) );
+
+    polytope.add( osg::Plane(0.0, 1.0, 0.0, -(_bb.yMin()-delta)) );
+    polytope.add( osg::Plane(0.0, -1.0, 0.0, (_bb.yMax()+delta)) );
+}
+
+void ComputeBoundsVisitor::getBase(osg::Polytope& polytope, float margin) const
+{
+    float delta = _bb.radius()*margin;
+    polytope.add( osg::Plane(0.0, 0.0, 1.0, -(_bb.zMin()-delta)) );
+}
+
+void ComputeBoundsVisitor::apply(osg::Node& node)
+{
+    traverse(node);
+}
+
+void ComputeBoundsVisitor::apply(osg::Transform& transform)
+{
+    osg::Matrix matrix;
+    if (!_matrixStack.empty()) matrix = _matrixStack.back();
+
+    transform.computeLocalToWorldMatrix(matrix,this);
+
+    pushMatrix(matrix);
+
+    traverse(transform);
+
+    popMatrix();
+}
+
+void ComputeBoundsVisitor::apply(osg::Geode& geode)
+{
+    for(unsigned int i=0; i<geode.getNumDrawables(); ++i)
+    {
+        applyDrawable(geode.getDrawable(i));
+    }
+}
+
+void ComputeBoundsVisitor::applyDrawable(osg::Drawable* drawable)
+{
+    if (_matrixStack.empty()) _bb.expandBy(drawable->getBound());
+    else
+    {
+        osg::Matrix& matrix = _matrixStack.back();
+        const osg::BoundingBox& dbb = drawable->getBound();
+        if (dbb.valid())
+        {
+            _bb.expandBy(dbb.corner(0) * matrix);
+            _bb.expandBy(dbb.corner(1) * matrix);
+            _bb.expandBy(dbb.corner(2) * matrix);
+            _bb.expandBy(dbb.corner(3) * matrix);
+            _bb.expandBy(dbb.corner(4) * matrix);
+            _bb.expandBy(dbb.corner(5) * matrix);
+            _bb.expandBy(dbb.corner(6) * matrix);
+            _bb.expandBy(dbb.corner(7) * matrix);
+        }
+    }
+}

src/osg/GNUmakefile

@@ -25,6 +25,7 @@ CXXFILES =\
 	CollectOccludersVisitor.cpp\
 	ColorMask.cpp\
 	ColorMatrix.cpp\
+	ComputeBoundsVisitor.cpp\
 	ConvexPlanarOccluder.cpp\
 	ConvexPlanarPolygon.cpp\
 	CoordinateSystemNode.cpp\