HI Nick, If you Camera that is following the main camera requires the same view matrix then could you not simply set the Camera::ReferenceFrame to REALATVE_TF so that it inherits the view and projection matrix from above?
Robert. On 25 October 2014 08:35, Trajce Nikolov NICK <[email protected] > wrote: > Hi Robert, > > below is my frame code, and this seam to fix it. But, just a question, > shouldnt the main view matrix be updated by the camera manipulator prior to > any other update (I have attached UpdateCallback to the pre render camera > and these seam to be called before the main camera update which results in > frame delay)? > > if (_viewer.valid()) > { > static bool firstFrame = true; > if (firstFrame) > { > _viewer->frame(); > > firstFrame = false; > } > else > { > _viewer->advance(); > _viewer->eventTraversal(); > _viewer->updateTraversal(); > > if (_reflectionCamera.valid()) > { > > _reflectionCamera->setViewMatrix(_viewer->getView(0)->getCamera()->getViewMatrix()); > } > _viewer->renderingTraversals(); > } > > } > > This way it works, it gurantee the pre render camera has the updated view > matrix > With this update callback it is with delay > > class FollowMainCameraNodeCallback : public osg::NodeCallback > { > public: > FollowMainCameraNodeCallback(osg::Camera* camera) > : _camera(camera) > { > > } > > virtual void operator()(osg::Node* node, osg::NodeVisitor* nv) > { > osg::Camera* thisCamera = dynamic_cast<osg::Camera*>(node); > if (!thisCamera) return; > > thisCamera->setViewMatrix(_camera->getViewMatrix()); > > ..... > _reflectionCamera->setUpdateCallback(new > FollowMainCameraNodeCallback(_viewer->getView(0)->getCamera())); > > Nick > > > On Fri, Oct 24, 2014 at 5:31 PM, Trajce Nikolov NICK < > [email protected]> wrote: > >> thanks Robert >> >> Nick >> >> On Fri, Oct 24, 2014 at 5:19 PM, Robert Osfield <[email protected] >> > wrote: >> >>> Hi Nick, >>> >>> The update of the CameraManipulator happens at the end of >>> VIewer::updateTraversal(). The default Viewer::frame() implementation() >>> runs the event and then update traversal. >>> >>> Your own application can override any of the viewer.frame() or >>> updateTraversal/eventTraversal() methods so if you want to take control and >>> do things in a different from standard you can do. >>> >>> Robert. >>> >>> On 24 October 2014 16:13, Trajce Nikolov NICK < >>> [email protected]> wrote: >>> >>>> Hi Community, >>>> >>>> I am facing the same problem for long time and always have to "hack >>>> it". I have prerender camera that has to follow the main camera. My >>>> pre-render camera is always a frame behind the main camera which is updated >>>> by a CameraManipulator. >>>> >>>> The update of the Pre-Render camera is done with UpdateCallback that >>>> simply copy the ViewMatrix of the main camera, but it seam that the main >>>> camera is updated afterwards. >>>> >>>> What is the order of these updates? I was expecting the main camera is >>>> updated from the CameraMainpulator and then everything else (including the >>>> Pre-Render cameras), but seam it is not the case? >>>> >>>> Any hints on this? >>>> >>>> Thanks a bunch as always! >>>> >>>> Nick >>>> >>>> -- >>>> trajce nikolov nick >>>> >>>> _______________________________________________ >>>> osg-users mailing list >>>> [email protected] >>>> >>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >>>> >>>> >>> >>> _______________________________________________ >>> osg-users mailing list >>> [email protected] >>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >>> >>> >> >> >> -- >> trajce nikolov nick >> > > > > -- > trajce nikolov nick > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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