Changeset 4439 for OpenSceneGraph/trunk/examples/osgcamera/osgcamera.cpp

Timestamp:

08/17/05 18:13:06 (8 years ago)

Author:

robert

Message:

Replaced osgUtil::SceneView? usage by osg::CameraNode?

Files:

• OpenSceneGraph/trunk/examples/osgcamera/osgcamera.cpp (modified) (5 diffs)

OpenSceneGraph/trunk/examples/osgcamera/osgcamera.cpp

@@ -6 +6 @@
 #include <osg/Timer>
 #include <osg/GraphicsContext>
-#include <osgUtil/SceneView>
+
+#include <osgUtil/UpdateVisitor>
+#include <osgUtil/CullVisitor>
+
 #include <osgDB/ReadFile>
+
 #include <iostream>
+
+#if 1
 
 int main( int argc, char **argv )
@@ -47 +53 @@
 
     // create the view of the scene.
-    osg::ref_ptr<osgUtil::SceneView> sceneView = new osgUtil::SceneView;
-    sceneView->setDefaults();
-    sceneView->setSceneData(loadedModel.get());
+    osg::ref_ptr<osg::CameraNode> camera = new osg::CameraNode;
+    camera->addChild(loadedModel.get());
 
     // initialize the view to look at the center of the scene graph
@@ -63 +68 @@
     // make the graphics context current
     gfxc->makeCurrent();
+    
+    osg::ref_ptr<osgUtil::UpdateVisitor> updateVisitor = new osgUtil::UpdateVisitor;
+    osg::ref_ptr<osgUtil::CullVisitor> cullVisitor = new osgUtil::CullVisitor;
+
+    cullVisitor->setRenderGraph(new osgUtil::RenderGraph);
+
+    osg::ref_ptr<osgUtil::RenderStage> renderStage = new osgUtil::RenderStage;
+    cullVisitor->setRenderStage(renderStage.get());
 
     // main loop (note, window toolkits which take control over the main loop will require a window redraw callback containing the code below.)
@@ -72 +85 @@
         frameStamp->setFrameNumber(frameNum++);
         
+        updateVisitor->reset();
+        cullVisitor->reset();
+        
+        // pass frame stamp to the SceneView so that the update, cull and draw traversals all use the same FrameStamp
+        updateVisitor->setFrameStamp(frameStamp.get());
+        updateVisitor->setTraversalNumber(frameStamp->getFrameNumber());
+
+        cullVisitor->setFrameStamp(frameStamp.get());
+        cullVisitor->setTraversalNumber(frameStamp->getFrameNumber());
+        
+        // update the viewport dimensions, incase the window has been resized.
+        camera->setViewport(0,0,traits->_width,traits->_height);
+        renderStage->setViewport(camera->getViewport());
+        
+        cullVisitor->pushViewport(camera->getViewport());
+        
+        // set the view
+        camera->setViewMatrix(viewMatrix);
+
+        // do the update traversal the scene graph - such as updating animations
+        camera->accept(*updateVisitor);
+        
+        // do the cull traversal, collect all objects in the view frustum into a sorted set of rendering bins
+        camera->accept(*cullVisitor);
+        
+        cullVisitor->popViewport();
+        
+        // draw traversal
+        osgUtil::RenderLeaf* previous = NULL;
+        renderStage->draw(*(gfxc->getState()), previous);
+
+        // Swap Buffers
+        gfxc->swapBuffers();
+    }
+
+    return 0;
+}
+
+#else
+
+int main( int argc, char **argv )
+{
+    if (argc<2) 
+    {
+        std::cout << argv[0] <<": requires filename argument." << std::endl;
+        return 1;
+    }
+
+    // load the scene.
+    osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFile(argv[1]);
+    if (!loadedModel) 
+    {
+        std::cout << argv[0] <<": No data loaded." << std::endl;
+        return 1;
+    }
+    
+    osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
+    traits->_windowName = "osgcamera";
+    traits->_x = 100;
+    traits->_y = 100;
+    traits->_width = 800;
+    traits->_height = 800;
+    traits->_windowDecoration = true;
+    traits->_doubleBuffer = true;
+    
+    osg::ref_ptr<osg::GraphicsContext> gfxc = osg::GraphicsContext::createGraphicsContext(traits.get());
+    
+    if (!gfxc)
+    {
+        std::cout<<"Unable to create window."<<std::endl;
+        return 1;
+    }
+    
+    // realise the window
+    gfxc->realize();
+
+    // create the view of the scene.
+    osg::ref_ptr<osgUtil::SceneView> sceneView = new osgUtil::SceneView;
+    sceneView->setDefaults();
+    sceneView->setSceneData(loadedModel.get());
+
+    // initialize the view to look at the center of the scene graph
+    const osg::BoundingSphere& bs = loadedModel->getBound();
+    osg::Matrix viewMatrix;
+    viewMatrix.makeLookAt(bs.center()-osg::Vec3(0.0,2.0f*bs.radius(),0.0),bs.center(),osg::Vec3(0.0f,0.0f,1.0f));
+
+    // record the timer tick at the start of rendering.    
+    osg::Timer_t start_tick = osg::Timer::instance()->tick();
+    
+    unsigned int frameNum = 0;
+    
+    // make the graphics context current
+    gfxc->makeCurrent();
+
+    // main loop (note, window toolkits which take control over the main loop will require a window redraw callback containing the code below.)
+    while( gfxc->isRealized() )
+    {
+        // set up the frame stamp for current frame to record the current time and frame number so that animtion code can advance correctly
+        osg::ref_ptr<osg::FrameStamp> frameStamp = new osg::FrameStamp;
+        frameStamp->setReferenceTime(osg::Timer::instance()->delta_s(start_tick,osg::Timer::instance()->tick()));
+        frameStamp->setFrameNumber(frameNum++);
+        
         // pass frame stamp to the SceneView so that the update, cull and draw traversals all use the same FrameStamp
         sceneView->setFrameStamp(frameStamp.get());
@@ -96 +211 @@
     return 0;
 }
+
+#endif