From Wang Rui, "Attachment is an example of rendering 3D scenes to high resolution screenshots.
I uses a queue of Camera objects to do offscreen rendering with the Camera::attach() function. The entire picture is split into many tiles and it will take a few seconds while attaching and detaching cameras with tiles. You may select to output every tile as an image file, or combine them together to create a large poster, for example, a 12800 x 9600 image. Start the program like this: ./osgposter --output-poster --poster output.bmp --tilesize 800 600 --finalsize 8000 6000 cow.osg Adjust the scene camera to a suitable position and press 'p' or 'P' on the keyboard. Wait until sub-cameras dispatching is finished. And the poster file will be created while closing window. A 8000 x 6000 output.bmp will be created to show a fine-printed cow. :) The command below may also help: ./osgposter --help "
This commit is contained in:
Robert Osfield
399
examples/osgposter/PosterPrinter.cpp
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399
examples/osgposter/PosterPrinter.cpp
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#include <osg/ClusterCullingCallback>
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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#include <string.h>
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#include <iostream>
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#include <sstream>
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#include "PosterPrinter.h"
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/* PagedLoadingCallback: Callback for loading paged nodes while doing intersecting test */
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struct PagedLoadingCallback : public osgUtil::IntersectionVisitor::ReadCallback
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{
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virtual osg::Node* readNodeFile( const std::string& filename )
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{
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return osgDB::readNodeFile( filename );
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}
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};
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static osg::ref_ptr<PagedLoadingCallback> g_pagedLoadingCallback = new PagedLoadingCallback;
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/* LodCullingCallback: Callback for culling LODs and selecting the highest level */
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class LodCullingCallback : public osg::NodeCallback
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{
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public:
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virtual void operator()( osg::Node* node, osg::NodeVisitor* nv )
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{
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osg::LOD* lod = static_cast<osg::LOD*>(node);
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if ( lod && lod->getNumChildren()>0 )
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lod->getChild(lod->getNumChildren()-1)->accept(*nv);
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}
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};
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static osg::ref_ptr<LodCullingCallback> g_lodCullingCallback = new LodCullingCallback;
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/* PagedCullingCallback: Callback for culling paged nodes and selecting the highest level */
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class PagedCullingCallback : public osg::NodeCallback
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{
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public:
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virtual void operator()( osg::Node* node, osg::NodeVisitor* nv )
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{
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osg::PagedLOD* pagedLOD = static_cast<osg::PagedLOD*>(node);
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if ( pagedLOD && pagedLOD->getNumChildren()>0 )
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{
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unsigned int numChildren = pagedLOD->getNumChildren();
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bool updateTimeStamp = nv->getVisitorType()==osg::NodeVisitor::CULL_VISITOR;
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if ( nv->getFrameStamp() && updateTimeStamp )
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{
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double timeStamp = nv->getFrameStamp()?nv->getFrameStamp()->getReferenceTime():0.0;
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int frameNumber = nv->getFrameStamp()?nv->getFrameStamp()->getFrameNumber():0;
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pagedLOD->setFrameNumberOfLastTraversal( frameNumber );
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pagedLOD->setTimeStamp( numChildren-1, timeStamp );
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pagedLOD->setFrameNumber( numChildren-1, frameNumber );
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pagedLOD->getChild(numChildren-1)->accept(*nv);
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}
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// Request for new child
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if ( !pagedLOD->getDisableExternalChildrenPaging() &&
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nv->getDatabaseRequestHandler() &&
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numChildren<pagedLOD->getNumRanges() )
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{
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if ( pagedLOD->getDatabasePath().empty() )
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{
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nv->getDatabaseRequestHandler()->requestNodeFile(
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pagedLOD->getFileName(numChildren), pagedLOD,
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1.0, nv->getFrameStamp(),
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pagedLOD->getDatabaseRequest(numChildren), pagedLOD->getDatabaseOptions() );
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}
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else
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{
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nv->getDatabaseRequestHandler()->requestNodeFile(
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pagedLOD->getDatabasePath()+pagedLOD->getFileName(numChildren), pagedLOD,
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1.0, nv->getFrameStamp(),
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pagedLOD->getDatabaseRequest(numChildren), pagedLOD->getDatabaseOptions() );
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}
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}
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}
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//node->traverse(*nv);
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}
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};
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static osg::ref_ptr<PagedCullingCallback> g_pagedCullingCallback = new PagedCullingCallback;
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/* PosterVisitor: A visitor for adding culling callbacks to newly allocated paged nodes */
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PosterVisitor::PosterVisitor()
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: osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
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_appliedCount(0), _needToApplyCount(0),
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_addingCallbacks(true)
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{
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}
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void PosterVisitor::apply( osg::LOD& node )
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{
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/*if ( !hasCullCallback(node.getCullCallback(), g_lodCullingCallback.get()) )
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{
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if ( !node.getName().empty() )
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{
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PagedNodeNameSet::iterator itr = _pagedNodeNames.find( node.getName() );
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if ( itr!=_pagedNodeNames.end() )
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{
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insertCullCallback( node, g_lodCullingCallback.get() );
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_appliedCount++;
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}
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}
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}
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else if ( !_addingCallbacks )
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{
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node.removeCullCallback( g_lodCullingCallback.get() );
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_appliedCount--;
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}*/
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traverse( node );
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}
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void PosterVisitor::apply( osg::PagedLOD& node )
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{
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if ( !hasCullCallback(node.getCullCallback(), g_pagedCullingCallback.get()) )
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{
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for ( unsigned int i=0; i<node.getNumFileNames(); ++i )
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{
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if ( node.getFileName(i).empty() ) continue;
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PagedNodeNameSet::iterator itr = _pagedNodeNames.find( node.getFileName(i) );
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if ( itr!=_pagedNodeNames.end() )
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{
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node.addCullCallback( g_pagedCullingCallback.get() );
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_appliedCount++;
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}
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break;
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}
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}
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else if ( !_addingCallbacks )
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{
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node.removeCullCallback( g_pagedCullingCallback.get() );
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if ( _appliedCount>0 ) _appliedCount--;
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}
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traverse( node );
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}
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/* PosterIntersector: A simple polytope intersector for updating pagedLODs in each image-tile */
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PosterIntersector::PosterIntersector( const osg::Polytope& polytope )
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: _intersectionVisitor(0), _parent(0), _polytope(polytope)
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{}
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PosterIntersector::PosterIntersector( double xMin, double yMin, double xMax, double yMax )
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: Intersector(osgUtil::Intersector::PROJECTION),
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_intersectionVisitor(0), _parent(0)
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{
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_polytope.add( osg::Plane( 1.0, 0.0, 0.0,-xMin) );
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_polytope.add( osg::Plane(-1.0, 0.0, 0.0, xMax) );
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_polytope.add( osg::Plane( 0.0, 1.0, 0.0,-yMin) );
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_polytope.add( osg::Plane( 0.0,-1.0, 0.0, yMax) );
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}
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osgUtil::Intersector* PosterIntersector::clone( osgUtil::IntersectionVisitor& iv )
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{
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osg::Matrix matrix;
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if ( iv.getProjectionMatrix() ) matrix.preMult( *iv.getProjectionMatrix() );
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if ( iv.getViewMatrix() ) matrix.preMult( *iv.getViewMatrix() );
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if ( iv.getModelMatrix() ) matrix.preMult( *iv.getModelMatrix() );
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osg::Polytope transformedPolytope;
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transformedPolytope.setAndTransformProvidingInverse( _polytope, matrix );
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osg::ref_ptr<PosterIntersector> pi = new PosterIntersector( transformedPolytope );
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pi->_intersectionVisitor = &iv;
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pi->_parent = this;
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return pi.release();
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}
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bool PosterIntersector::enter( const osg::Node& node )
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{
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if ( !node.isCullingActive() ) return true;
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if ( _polytope.contains(node.getBound()) )
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{
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if ( node.getCullCallback() )
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{
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const osg::ClusterCullingCallback* cccb =
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dynamic_cast<const osg::ClusterCullingCallback*>( node.getCullCallback() );
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if ( cccb && cccb->cull(_intersectionVisitor, 0, NULL) ) return false;
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}
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return true;
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}
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return false;
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}
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void PosterIntersector::reset()
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{
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_intersectionVisitor = NULL;
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Intersector::reset();
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}
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void PosterIntersector::intersect( osgUtil::IntersectionVisitor& iv, osg::Drawable* drawable )
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{
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if ( !_polytope.contains(drawable->getBound()) ) return;
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if ( iv.getDoDummyTraversal() ) return;
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// Find and collect all paged LODs in the node path
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osg::NodePath& nodePath = iv.getNodePath();
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for ( osg::NodePath::iterator itr=nodePath.begin(); itr!=nodePath.end(); ++itr )
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{
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osg::PagedLOD* pagedLOD = dynamic_cast<osg::PagedLOD*>(*itr);
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if ( pagedLOD )
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{
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// FIXME: The first non-empty getFileName() is used as the identity of this paged node.
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// This should work with VPB-generated terrains but maybe unusable with others.
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for ( unsigned int i=0; i<pagedLOD->getNumFileNames(); ++i )
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{
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if ( pagedLOD->getFileName(i).empty() ) continue;
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if ( _parent->_visitor.valid() )
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_parent->_visitor->insertName( pagedLOD->getFileName(i) );
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break;
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}
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continue;
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}
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/*osg::LOD* lod = dynamic_cast<osg::LOD*>(*itr);
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if ( lod )
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{
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if ( !lod->getName().empty() && _parent->_visitor.valid() )
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_parent->_visitor->insertName( lod->getName() );
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}*/
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}
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}
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/* PosterPrinter: The implementation class of high-res rendering */
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PosterPrinter::PosterPrinter()
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: _isRunning(false), _isFinishing(false), _lastBindingFrame(0),
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_outputTiles(false), _outputTileExt("bmp"),
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_currentRow(0), _currentColumn(0),
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_camera(0), _finalPoster(0)
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{
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_intersector = new PosterIntersector(-1.0, -1.0, 1.0, 1.0);
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_visitor = new PosterVisitor;
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_intersector->setPosterVisitor( _visitor.get() );
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}
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void PosterPrinter::init( const osg::Camera* camera )
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{
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if ( _camera.valid() )
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init( camera->getViewMatrix(), camera->getProjectionMatrix() );
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}
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void PosterPrinter::init( const osg::Matrixd& view, const osg::Matrixd& proj )
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{
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if ( _isRunning ) return;
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_images.clear();
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_visitor->clearNames();
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_tileRows = (int)(_posterSize.y() / _tileSize.y());
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_tileColumns = (int)(_posterSize.x() / _tileSize.x());
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_currentRow = 0;
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_currentColumn = 0;
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_currentViewMatrix = view;
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_currentProjectionMatrix = proj;
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_lastBindingFrame = 0;
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_isRunning = true;
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_isFinishing = false;
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}
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void PosterPrinter::frame( const osg::FrameStamp* fs, osg::Node* node )
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{
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// Add cull callbacks to all existing paged nodes,
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// and advance frame when all callbacks are dispatched.
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if ( addCullCallbacks(fs, node) )
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return;
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if ( _isFinishing )
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{
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if ( (fs->getFrameNumber()-_lastBindingFrame)>2 )
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{
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// Record images and the final poster
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recordImages();
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if ( _finalPoster.valid() )
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{
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std::cout << "Writing final result to file..." << std::endl;
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osgDB::writeImageFile( *_finalPoster, _outputPosterName );
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}
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// Release all cull callbacks to free unused paged nodes
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removeCullCallbacks( node );
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_visitor->clearNames();
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_isFinishing = false;
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std::cout << "Recording images finished." << std::endl;
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}
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}
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if ( _isRunning )
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{
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// Every "copy-to-image" process seems to be finished in 2 frames.
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// So record them and dispatch camera to next tiles.
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if ( (fs->getFrameNumber()-_lastBindingFrame)>2 )
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{
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// Record images and unref them to free memory
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recordImages();
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// Release all cull callbacks to free unused paged nodes
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removeCullCallbacks( node );
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_visitor->clearNames();
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if ( _camera.valid() )
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{
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std::cout << "Binding sub-camera " << _currentRow << "_" << _currentColumn
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<< " to image..." << std::endl;
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bindCameraToImage( _camera.get(), _currentRow, _currentColumn );
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if ( _currentColumn<_tileColumns-1 )
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{
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_currentColumn++;
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}
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else
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{
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if ( _currentRow<_tileRows-1 )
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{
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_currentRow++;
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_currentColumn = 0;
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}
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else
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{
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_isRunning = false;
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_isFinishing = true;
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}
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}
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}
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_lastBindingFrame = fs->getFrameNumber();
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}
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}
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}
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bool PosterPrinter::addCullCallbacks( const osg::FrameStamp* fs, osg::Node* node )
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{
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if ( !_visitor->inQueue() || done() )
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return false;
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_visitor->setAddingCallbacks( true );
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_camera->accept( *_visitor );
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_lastBindingFrame = fs->getFrameNumber();
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std::cout << "Dispatching callbacks to paged nodes... "
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<< _visitor->inQueue() << std::endl;
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return true;
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}
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void PosterPrinter::removeCullCallbacks( osg::Node* node )
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{
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_visitor->setAddingCallbacks( false );
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_camera->accept( *_visitor );
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}
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void PosterPrinter::bindCameraToImage( osg::Camera* camera, int row, int col )
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{
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std::stringstream stream;
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stream << "image_" << row << "_" << col;
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osg::ref_ptr<osg::Image> image = new osg::Image;
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image->setName( stream.str() );
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image->allocateImage( (int)_tileSize.x(), (int)_tileSize.y(), 1, GL_RGBA, GL_UNSIGNED_BYTE );
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_images[TilePosition(row,col)] = image.get();
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// Calculate projection matrix offset of each tile
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osg::Matrix offsetMatrix =
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osg::Matrix::scale(_tileColumns, _tileRows, 1.0) *
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osg::Matrix::translate(_tileColumns-1-2*col, _tileRows-1-2*row, 0.0);
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camera->setViewMatrix( _currentViewMatrix );
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camera->setProjectionMatrix( _currentProjectionMatrix * offsetMatrix );
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// Check intersections between the image-tile box and the model
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osgUtil::IntersectionVisitor iv( _intersector.get() );
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iv.setReadCallback( g_pagedLoadingCallback.get() );
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_intersector->reset();
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camera->accept( iv );
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if ( _intersector->containsIntersections() )
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{
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// Apply a cull calback to every paged node obtained, to force the highest level displaying.
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// This will be done by the PosterVisitor, who already records all the paged nodes.
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}
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// Reattach cameras and new allocated images
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camera->setRenderingCache( NULL ); // FIXME: Uses for reattaching camera with image, maybe inefficient?
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camera->detach( osg::Camera::COLOR_BUFFER );
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camera->attach( osg::Camera::COLOR_BUFFER, image.get(), 0, 0 );
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}
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void PosterPrinter::recordImages()
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{
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for ( TileImages::iterator itr=_images.begin(); itr!=_images.end(); ++itr )
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{
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osg::Image* image = (itr->second).get();
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if ( _finalPoster.valid() )
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{
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// FIXME: A stupid way to combine tile images to final result. Any better ideas?
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unsigned int row = itr->first.first, col = itr->first.second;
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for ( int t=0; t<image->t(); ++t )
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{
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unsigned char* source = image->data( 0, t );
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unsigned char* target = _finalPoster->data( col*(int)_tileSize.x(), t + row*(int)_tileSize.y() );
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memcpy( target, source, image->s() * 4 * sizeof(unsigned char) );
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}
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}
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if ( _outputTiles )
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osgDB::writeImageFile( *image, image->getName()+"."+_outputTileExt );
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}
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_images.clear();
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}
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Reference in New Issue
Block a user