Hello Sajjadul,
Sajjadul Islam wrote:
Hello Francesco,
Thanks for the hint, I checked the documentation but did not get much out of
that .
the SplitGraphOp split up the graph into several parts that contains a pre specified
number of polygons.
After the split operation i am trying to retrieve the geometry which i have to do to set the
material to it. And there is where probably the problem arises. There may be multiple nodes
containing the separated geometry core with the pre-specified number of polygons.
yes.
How to access them?
your graph probably changes from
|
node[geo]
to something like
|
node[group]
|
+---------------+ ...
| |
node[geo] node[geo]
(the group might be something different, maybe a MaterialGroup).
The SplitGraphOp will probably drop the name(s) if you had any assigned
to the Node and/or Geometry (where should the they be placed?).
This all boils down to: Examine the graph before and after the GraphOp
is applied, then you should be able to figure out where the new (split)
Geometries are placed.
Hope it helps,
Carsten
PS: The attached class may be useful to examine the scenegraph (for
small scenes). It is not very sophisticated, but it might be a starting
point.
#include <SceneGraphPrinter.h>
// OpenSG includes
#include <OpenSG/OSGSimpleAttachments.h>
SceneGraphPrinter::SceneGraphPrinter(OSG::NodePtr root)
: _pRoot (root),
_pStream(NULL),
_indent (0)
{
// nothing to do
}
void
SceneGraphPrinter::print(std::ostream &os)
{
_pStream = &os;
_indent = 0;
OSG::traverse(
_pRoot,
OSG::osgTypedMethodFunctor1ObjPtrCPtrRef<
OSG::Action::ResultE,
SceneGraphPrinter,
OSG::NodePtr >(this, &Self::traverseEnter),
OSG::osgTypedMethodFunctor2ObjPtrCPtrRef<
OSG::Action::ResultE,
SceneGraphPrinter,
OSG::NodePtr,
OSG::Action::ResultE >(this, &Self::traverseLeave));
}
OSG::Action::ResultE
SceneGraphPrinter::traverseEnter(OSG::NodePtr &node)
{
if(node == OSG::NullFC)
return OSG::Action::Continue;
std::ostream &os = *_pStream;
incIndent();
indentStream(os)
<< "[" << node.getCPtr()
<< "] [" << (OSG::getName(node) ? OSG::getName(node) : "<unnamed>")
<< "]";
OSG::NodeCorePtr pCore = node->getCore();
if(pCore == OSG::NullFC)
{
os << "\n";
return OSG::Action::Continue;
}
os << " -- [" << pCore.getCPtr() << "]"
<< " [" << pCore->getType().getCName() << "]";
os << " [" << (OSG::getName(pCore) ? OSG::getName(pCore) : "<unnamed>")
<< "]";
OSG::MFNodePtr::const_iterator pIt = pCore->getParents().begin();
OSG::MFNodePtr::const_iterator pEnd = pCore->getParents().end ();
os << " --";
for(; pIt != pEnd; ++pIt)
{
os << " [" << node.getCPtr()
<< "] [" << (OSG::getName(node) ? OSG::getName(node) : "<unnamed>")
<< "]";
}
os << "\n";
return OSG::Action::Continue;
}
OSG::Action::ResultE
SceneGraphPrinter::traverseLeave(OSG::NodePtr &node, OSG::Action::ResultE
res)
{
if(node == OSG::NullFC)
return OSG::Action::Continue;
decIndent();
return OSG::Action::Continue;
}
#ifndef _SCENEGRPAHPRINTER_H_
#define _SCENEGRPAHPRINTER_H_
// OpenSG includes
#include <OpenSG/OSGAction.h>
#include <OpenSG/OSGNode.h>
// std library includes
#include <iosfwd>
class SceneGraphPrinter
{
public:
typedef SceneGraphPrinter Self;
SceneGraphPrinter(OSG::NodePtr root);
void print(std::ostream &os);
private:
OSG::NodePtr _pRoot;
std::ostream *_pStream;
OSG::UInt32 _indent;
OSG::Action::ResultE traverseEnter(OSG::NodePtr &node );
OSG::Action::ResultE traverseLeave(OSG::NodePtr &node,
OSG::Action::ResultE res );
void incIndent (void );
void decIndent (void );
std::ostream &indentStream(std::ostream &os);
};
inline void
SceneGraphPrinter::incIndent(void)
{
_indent += 2;
}
inline void
SceneGraphPrinter::decIndent(void)
{
_indent -= 2;
}
inline std::ostream &
SceneGraphPrinter::indentStream(std::ostream &os)
{
for(OSG::UInt32 i = 0; i < _indent; ++i)
os << " ";
return os;
}
#endif //_SCENEGRPAHPRINTER_H_
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