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
384
examples/osgposter/osgposter.cpp
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384
examples/osgposter/osgposter.cpp
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/* -*-c++-*- OpenSceneGraph example, osgposter.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <osg/ArgumentParser>
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#include <osg/Texture2D>
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#include <osg/Switch>
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#include <osgDB/ReadFile>
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#include <osgDB/WriteFile>
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#include <osgGA/TrackballManipulator>
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#include <osgGA/StateSetManipulator>
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#include <osgViewer/Renderer>
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#include <osgViewer/Viewer>
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#include <osgViewer/ViewerEventHandlers>
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#include <iostream>
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#include "PosterPrinter.h"
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/* Computing view matrix helpers */
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template<class T>
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class FindTopMostNodeOfTypeVisitor : public osg::NodeVisitor
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{
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public:
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FindTopMostNodeOfTypeVisitor()
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: osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
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_foundNode(0)
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{}
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void apply( osg::Node& node )
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{
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T* result = dynamic_cast<T*>( &node );
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if ( result ) _foundNode = result;
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else traverse( node );
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}
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T* _foundNode;
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};
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template<class T>
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T* findTopMostNodeOfType( osg::Node* node )
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{
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if ( !node ) return 0;
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FindTopMostNodeOfTypeVisitor<T> fnotv;
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node->accept( fnotv );
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return fnotv._foundNode;
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}
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/* Computing view matrix functions */
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void computeViewMatrix( osg::Camera* camera, const osg::Vec3d& eye, const osg::Vec3d& hpr )
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{
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osg::Matrixd matrix;
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matrix.makeTranslate( eye );
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matrix.preMult( osg::Matrixd::rotate( hpr[0], 0.0, 1.0, 0.0) );
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matrix.preMult( osg::Matrixd::rotate( hpr[1], 1.0, 0.0, 0.0) );
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matrix.preMult( osg::Matrixd::rotate( hpr[2], 0.0, 0.0, 1.0) );
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camera->setViewMatrix( osg::Matrixd::inverse(matrix) );
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}
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void computeViewMatrixOnEarth( osg::Camera* camera, osg::Node* scene,
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const osg::Vec3d& latLongHeight, const osg::Vec3d& hpr )
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{
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osg::CoordinateSystemNode* csn = findTopMostNodeOfType<osg::CoordinateSystemNode>(scene);
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if ( !csn ) return;
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// Compute eye point in world coordiantes
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osg::Vec3d eye;
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csn->getEllipsoidModel()->convertLatLongHeightToXYZ(
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latLongHeight.x(), latLongHeight.y(), latLongHeight.z(), eye.x(), eye.y(), eye.z() );
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// Build matrix for computing target vector
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osg::Matrixd target_matrix =
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osg::Matrixd::rotate( -hpr.x(), osg::Vec3d(1,0,0),
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-latLongHeight.x(), osg::Vec3d(0,1,0),
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latLongHeight.y(), osg::Vec3d(0,0,1) );
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// Compute tangent vector
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osg::Vec3d tangent = target_matrix.preMult( osg::Vec3d(0,0,1) );
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// Compute non-inclined, non-rolled up vector
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osg::Vec3d up( eye );
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up.normalize();
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// Incline by rotating the target- and up vector around the tangent/up-vector
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// cross-product
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osg::Vec3d up_cross_tangent = up ^ tangent;
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osg::Matrixd incline_matrix = osg::Matrixd::rotate( hpr.y(), up_cross_tangent );
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osg::Vec3d target = incline_matrix.preMult( tangent );
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// Roll by rotating the up vector around the target vector
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osg::Matrixd roll_matrix = incline_matrix * osg::Matrixd::rotate( hpr.z(), target );
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up = roll_matrix.preMult( up );
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camera->setViewMatrixAsLookAt( eye, eye+target, up );
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}
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/* CustomRenderer: Do culling only while loading PagedLODs */
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class CustomRenderer : public osgViewer::Renderer
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{
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public:
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CustomRenderer( osg::Camera* camera )
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: osgViewer::Renderer(camera), _cullOnly(true)
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{
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}
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void setCullOnly(bool on) { _cullOnly = on; }
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virtual void operator ()( osg::GraphicsContext* )
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{
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if ( _graphicsThreadDoesCull )
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{
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if (_cullOnly) cull();
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else cull_draw();
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}
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}
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virtual void cull()
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{
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osgUtil::SceneView* sceneView = _sceneView[0].get();
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if ( !sceneView || _done || _graphicsThreadDoesCull )
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return;
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updateSceneView( sceneView );
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osgViewer::View* view = dynamic_cast<osgViewer::View*>( _camera->getView() );
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if ( view )
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sceneView->setFusionDistance( view->getFusionDistanceMode(), view->getFusionDistanceValue() );
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sceneView->inheritCullSettings( *(sceneView->getCamera()) );
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sceneView->cull();
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}
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bool _cullOnly;
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};
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/* PrintPosterHandler: A gui handler for interactive high-res capturing */
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class PrintPosterHandler : public osgGA::GUIEventHandler
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{
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public:
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PrintPosterHandler( PosterPrinter* printer )
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: _printer(printer), _started(false) {}
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bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa )
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{
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osgViewer::View* view = dynamic_cast<osgViewer::View*>( &aa );
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if ( !view ) return false;
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switch( ea.getEventType() )
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{
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case osgGA::GUIEventAdapter::FRAME:
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if ( view->getDatabasePager() )
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{
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// Wait until all paged nodes are processed
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if ( view->getDatabasePager()->getRequestsInProgress() )
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break;
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}
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if ( _printer.valid() )
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{
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_printer->frame( view->getFrameStamp(), view->getSceneData() );
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if ( _started && _printer->done() )
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{
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osg::Switch* root = dynamic_cast<osg::Switch*>( view->getSceneData() );
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if ( root )
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{
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// Assume child 0 is the loaded model and 1 is the poster camera
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// Switch them in time to prevent dual traversals of subgraph
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root->setValue( 0, true );
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root->setValue( 1, false );
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}
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_started = false;
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}
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}
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break;
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case osgGA::GUIEventAdapter::KEYDOWN:
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if ( ea.getKey()=='p' || ea.getKey()=='P' )
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{
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if ( _printer.valid() )
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{
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osg::Switch* root = dynamic_cast<osg::Switch*>( view->getSceneData() );
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if ( root )
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{
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// Assume child 0 is the loaded model and 1 is the poster camera
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root->setValue( 0, false );
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root->setValue( 1, true );
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}
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_printer->init( view->getCamera() );
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_started = true;
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}
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return true;
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}
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break;
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default:
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break;
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}
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return false;
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}
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protected:
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osg::ref_ptr<PosterPrinter> _printer;
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bool _started;
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};
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/* The main entry */
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int main( int argc, char** argv )
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{
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osg::ArgumentParser arguments( &argc, argv );
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osg::ApplicationUsage* usage = arguments.getApplicationUsage();
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usage->setDescription( arguments.getApplicationName() +
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" is the example which demonstrates how to render high-resolution images (posters).");
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usage->setCommandLineUsage( arguments.getApplicationName() + " [options] scene_file" );
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usage->addCommandLineOption( "-h or --help", "Display this information." );
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usage->addCommandLineOption( "--color <r> <g> <b>", "The background color." );
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usage->addCommandLineOption( "--ext <ext>", "The output tiles' extension (Default: bmp)." );
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usage->addCommandLineOption( "--poster <filename>", "The output poster's name (Default: poster.bmp)." );
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usage->addCommandLineOption( "--tilesize <w> <h>", "Size of each image tile (Default: 640 480)." );
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usage->addCommandLineOption( "--finalsize <w> <h>", "Size of the poster (Default: 6400 4800)." );
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usage->addCommandLineOption( "--enable-output-poster", "Output the final poster file (Default)." );
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usage->addCommandLineOption( "--disable-output-poster", "Don't output the final poster file." );
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usage->addCommandLineOption( "--enable-output-tiles", "Output all tile files." );
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usage->addCommandLineOption( "--disable-output-tiles", "Don't output all tile files (Default)." );
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usage->addCommandLineOption( "--use-fb", "Use Frame Buffer for rendering tiles (Default, recommended).");
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usage->addCommandLineOption( "--use-fbo", "Use Frame Buffer Object for rendering tiles.");
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usage->addCommandLineOption( "--use-pbuffer","Use Pixel Buffer for rendering tiles.");
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usage->addCommandLineOption( "--use-pbuffer-rtt","Use Pixel Buffer RTT for rendering tiles.");
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usage->addCommandLineOption( "--inactive", "Inactive capturing mode." );
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usage->addCommandLineOption( "--camera-eye <x> <y> <z>", "Set eye position in inactive mode." );
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usage->addCommandLineOption( "--camera-latlongheight <lat> <lon> <h>", "Set eye position on earth in inactive mode." );
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usage->addCommandLineOption( "--camera-hpr <h> <p> <r>", "Set eye rotation in inactive mode." );
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if ( arguments.read("-h") || arguments.read("--help") )
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{
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usage->write( std::cout );
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return 1;
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}
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// Poster arguments
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bool activeMode = true;
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bool outputPoster = true, outputTiles = false;
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int tileWidth = 640, tileHeight = 480;
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int posterWidth = 640*2, posterHeight = 480*2;
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std::string posterName = "poster.bmp", extName = "bmp";
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osg::Vec4 bgColor(0.2f, 0.2f, 0.6f, 1.0f);
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osg::Camera::RenderTargetImplementation renderImplementation = osg::Camera::FRAME_BUFFER;
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while ( arguments.read("--inactive") ) { activeMode = false; }
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while ( arguments.read("--color", bgColor.r(), bgColor.g(), bgColor.b()) ) {}
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while ( arguments.read("--tilesize", tileWidth, tileHeight) ) {}
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while ( arguments.read("--finalsize", posterWidth, posterHeight) ) {}
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while ( arguments.read("--poster", posterName) ) {}
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while ( arguments.read("--ext", extName) ) {}
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while ( arguments.read("--enable-output-poster") ) { outputPoster = true; }
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while ( arguments.read("--disable-output-poster") ) { outputPoster = false; }
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while ( arguments.read("--enable-output-tiles") ) { outputTiles = true; }
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while ( arguments.read("--disable-output-tiles") ) { outputTiles = false; }
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while ( arguments.read("--use-fbo")) { renderImplementation = osg::Camera::FRAME_BUFFER_OBJECT; }
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while ( arguments.read("--use-pbuffer")) { renderImplementation = osg::Camera::PIXEL_BUFFER; }
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while ( arguments.read("--use-pbuffer-rtt")) { renderImplementation = osg::Camera::PIXEL_BUFFER_RTT; }
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while ( arguments.read("--use-fb")) { renderImplementation = osg::Camera::FRAME_BUFFER; }
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// Camera settings for inactive screenshot
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bool useLatLongHeight = true;
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osg::Vec3d eye;
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osg::Vec3d latLongHeight( 50.0, 10.0, 2000.0 );
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osg::Vec3d hpr( 0.0, 0.0, 0.0 );
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if ( arguments.read("--camera-eye", eye.x(), eye.y(), eye.z()) )
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{
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useLatLongHeight = false;
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activeMode = false;
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}
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else if ( arguments.read("--camera-latlongheight", latLongHeight.x(), latLongHeight.y(), latLongHeight.z()) )
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{
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activeMode = false;
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latLongHeight.x() = osg::DegreesToRadians( latLongHeight.x() );
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latLongHeight.y() = osg::DegreesToRadians( latLongHeight.y() );
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}
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if ( arguments.read("--camera-hpr", hpr.x(), hpr.y(), hpr.z()) )
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{
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activeMode = false;
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hpr.x() = osg::DegreesToRadians( hpr.x() );
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hpr.y() = osg::DegreesToRadians( hpr.y() );
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hpr.z() = osg::DegreesToRadians( hpr.z() );
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}
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// Construct scene graph
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osg::Node* scene = osgDB::readNodeFiles( arguments );
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if ( !scene ) scene = osgDB::readNodeFile( "cow.osg" );
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if ( !scene )
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{
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std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
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return 1;
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}
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// Create camera for rendering tiles offscreen. FrameBuffer is recommended because it requires less memory.
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osg::ref_ptr<osg::Camera> camera = new osg::Camera;
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camera->setClearColor( bgColor );
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camera->setClearMask( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
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camera->setReferenceFrame( osg::Transform::ABSOLUTE_RF );
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camera->setRenderOrder( osg::Camera::PRE_RENDER );
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camera->setRenderTargetImplementation( renderImplementation );
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camera->setViewport( 0, 0, tileWidth, tileHeight );
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camera->addChild( scene );
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// Set the printer
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osg::ref_ptr<PosterPrinter> printer = new PosterPrinter;
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printer->setTileSize( tileWidth, tileHeight );
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printer->setPosterSize( posterWidth, posterHeight );
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printer->setCamera( camera.get() );
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osg::ref_ptr<osg::Image> posterImage = 0;
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if ( outputPoster )
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{
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posterImage = new osg::Image;
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posterImage->allocateImage( posterWidth, posterHeight, 1, GL_RGBA, GL_UNSIGNED_BYTE );
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printer->setFinalPoster( posterImage.get() );
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printer->setOutputPosterName( posterName );
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}
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// Create root and start the viewer
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osg::ref_ptr<osg::Switch> root = new osg::Switch;
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root->addChild( scene, true );
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root->addChild( camera.get(), false );
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osgViewer::Viewer viewer;
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viewer.setUpViewInWindow( 100, 100, tileWidth, tileHeight );
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viewer.setSceneData( root.get() );
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viewer.getDatabasePager()->setDoPreCompile( false );
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if ( activeMode )
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{
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viewer.addEventHandler( new PrintPosterHandler(printer.get()) );
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viewer.addEventHandler( new osgViewer::StatsHandler );
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viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
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viewer.setCameraManipulator( new osgGA::TrackballManipulator );
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viewer.run();
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}
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else
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{
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osg::Camera* camera = viewer.getCamera();
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if ( !useLatLongHeight ) computeViewMatrix( camera, eye, hpr );
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else computeViewMatrixOnEarth( camera, scene, latLongHeight, hpr );
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osg::ref_ptr<CustomRenderer> renderer = new CustomRenderer( camera );
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camera->setRenderer( renderer.get() );
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viewer.setThreadingModel( osgViewer::Viewer::SingleThreaded );
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// Realize and initiate the first PagedLOD request
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viewer.realize();
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viewer.frame();
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printer->init( camera );
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while ( !printer->done() )
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{
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viewer.advance();
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// Keep updating and culling until full level of detail is reached
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renderer->setCullOnly( true );
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while ( viewer.getDatabasePager()->getRequestsInProgress() )
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{
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viewer.updateTraversal();
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viewer.renderingTraversals();
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}
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renderer->setCullOnly( false );
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printer->frame( viewer.getFrameStamp(), viewer.getSceneData() );
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viewer.renderingTraversals();
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}
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}
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return 0;
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}
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