Hi Robert,

I've been busy with other work and only now been able to try your proposed change and found that it doesn't quite work as expected. When I run the attached modified osgscribe example with the attached box-sphere.osg model the small feature culling only culls the entire model, i.e. both the box and the sphere together not separately as I was expecting. If small feature culling is turned on on the camera the box and sphere is culled by the small feature culling individually. I would like to enable small feature culling on quite large subgraphs and it seams that it only turns on small feature culling on the node with the callback not on the nodes bellow it. This feels very similar to the problem I was originally trying to solve, where the disabling of small feature culling wasn't propagated downwards but the fix I submitted then didn't fix this problem. Do I need to add the callback to all nodes that I wish to be culled by small feature culling or is this a problem in osg?

Regards,
Per

Robert Osfield wrote:
Hi Per,

On Wed, Jan 28, 2009 at 8:55 PM, Per Fahlberg <[email protected]> wrote:
I don't really understand how this is not a bug since it is possible to
switch small feature culling on for a subgraph but not switch it off?

The scene graph itself doesn't support switching off small feature
culling in a subgraph. The way you tried to add this back in was
inappropriate, so didn't work.

My proposed change to just enable small feature culling for subgraphs
that needn't it didn't require disabling culling for subgraphs so
would be more efficient as culling would never be complete disabled.
Disabling culling for a deeply embedded subgraph causes all the
parents culling to be disabled as well, which prevents early
termination of traversal that would otherwise be done so I wouldn't
recommend it.

I will however scratch my head and try to figure out if I can somehow easily
invert the enabling and disabling of small feature culling in my program.

You could just use LOD's, this is effectively all that small feature
culling simulates.

Alternatively you could just set the bounding box of the drawables of
interest to an artificially large size to prevent the small feature
culling from effecting them.

Robert.
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/* OpenSceneGraph example, osgscribe.
*
*  Permission is hereby granted, free of charge, to any person obtaining a copy
*  of this software and associated documentation files (the "Software"), to deal
*  in the Software without restriction, including without limitation the rights
*  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
*  copies of the Software, and to permit persons to whom the Software is
*  furnished to do so, subject to the following conditions:
*
*  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
*  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
*  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
*  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
*  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
*  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
*  THE SOFTWARE.
*/

#include <osg/Geode>
#include <osg/Group>
#include <osg/Notify>
#include <osg/Material>
#include <osg/PolygonOffset>
#include <osg/PolygonMode>
#include <osg/LineStipple>
#include <osg/PositionAttitudeTransform>

#include <osgDB/Registry>
#include <osgDB/ReadFile>
#include <osgDB/WriteFile>

#include <osgViewer/Viewer>

#include <osgUtil/Optimizer>

class MyCullingCallback : public osg::NodeCallback
{
public:
  MyCullingCallback() : osg::NodeCallback()
  {}

  virtual void operator() (osg::Node *node, osg::NodeVisitor *nv)
  {
    osgUtil::CullVisitor *cv = dynamic_cast<osgUtil::CullVisitor*>(nv);
    if(cv){
      osg::CullingSet &cs = cv->getCurrentCullingSet();      
      osg::CullingSet::Mask previousMask = cs.getCullingMask();
      cs.setCullingMask(previousMask | osg::CullSettings::SMALL_FEATURE_CULLING);

      traverse(node,nv);

      cs.setCullingMask(previousMask);
    }else
      traverse(node,nv);
  }
};

int main( int argc, char **argv )
{
    // use an ArgumentParser object to manage the program arguments.
    osg::ArgumentParser arguments(&argc,argv);

    // construct the viewer.
    osgViewer::Viewer viewer;

    osg::Camera *cam = viewer.getCamera();
    if(cam){
      // note just enable view furstum culling sides, leave it to subgraphs to enable 
      // small feature culling where required.
      cam->setCullingMode(osgUtil::CullVisitor::VIEW_FRUSTUM_SIDES_CULLING);
      //cam->setCullingMode(osgUtil::CullVisitor::VIEW_FRUSTUM_SIDES_CULLING | osgUtil::CullVisitor::SMALL_FEATURE_CULLING);
      cam->setSmallFeatureCullingPixelSize(100);
    }
    
    // load the nodes from the commandline arguments.
    osg::Node* loadedModel = osgDB::readNodeFiles(arguments);

    // if not loaded assume no arguments passed in, try use default mode instead.
    if (!loadedModel) loadedModel = osgDB::readNodeFile("cow.osg");
    
    if (!loadedModel)
    {
        osg::notify(osg::NOTICE)<<"Please specifiy a model filename on the command line."<<std::endl;
        return 1;
    }
    
    osg::Group* rootnode = new osg::Group;
    rootnode->addChild(loadedModel);
    
    osg::PositionAttitudeTransform *pat = new osg::PositionAttitudeTransform;
    
    pat->setPosition(osg::Vec3d(20, 0, 0));
    osg::Group *tmp = new osg::Group;

    // enable small feature culling for subgraph.
    tmp->setCullCallback(new MyCullingCallback);
    
    tmp->addChild(pat);
    rootnode->addChild(tmp);
    
    pat->addChild(loadedModel);  
    
    // add a viewport to the viewer and attach the scene graph.
    viewer.setSceneData( rootnode );
    
    return viewer.run();
}

Group {
  name "db"
  nodeMask 0xffffffff
  cullingActive TRUE
  num_children 2
  Group {
    name "o1"
    UserData {
    }
    nodeMask 0xffffffff
    cullingActive TRUE
    num_children 1
    Geode {
      DataVariance STATIC
      name "p11"
      nodeMask 0xffffffff
      cullingActive TRUE
      StateSet {
        UniqueID StateSet_0
        DataVariance STATIC
        rendering_hint DEFAULT_BIN
        renderBinMode INHERIT
        GL_CULL_FACE ON
        GL_LIGHTING ON
        Material {
          ColorMode OFF
          ambientColor 1 1 1 1
          diffuseColor 1 1 1 1
          specularColor 0 0 0 1
          emissionColor 0 0 0 1
          shininess 0
        }
        CullFace {
          UniqueID CullFace_1
          mode BACK
        }
      }
      num_drawables 1
      Geometry {
        DataVariance STATIC
        useDisplayList TRUE
        useVertexBufferObjects FALSE
        PrimitiveSets 2
        {
          DrawArrays TRIANGLES 0 72
          DrawArrays QUADS 72 480
        }
        VertexArray Vec3Array 552
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