<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Thanks Robert, that's actually what I tried initially and it renders fine, however there's a usability issue. For more background I'm rendering light fields. In order to do this I set up an array of thousands of slightly offset cameras in a rectangular grid pattern. Because I'm capturing so many views when I call <span style="font-family:Arial,Helvetica,sans-serif">osgViewer::Viewer::frame() </span>it locks the main thread and the application becomes unresponsive for a long time. </div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Ideally what I'd like is for the main application to continue rendering its single 3d view, while I render these thousands of cameras to a texture in a background thread. I'm rendering to a texture now without issue, but what's eluded me so far is how I can run this process without locking up the application.</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">I'd like to have a snapshot of the scene graph for this background thread so that the user can continue to use the main 3d view while the background thread renders a static copy of the scene graph. This is why I've been attempting to clone the root scene node recursively and pass it to my thread. Any concerns with that approach?</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">Cheers,</div><div class="gmail_default" style="font-family:tahoma,sans-serif">Rob</div><div class="gmail_default" style="font-family:tahoma,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif"><br></span></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif"><br></span></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Message: 9</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Date: Thu, 28 Feb 2019 18:53:19 +0000</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">From: Robert Osfield <</span><a href="mailto:robert.osfield@gmail.com" target="_blank" style="font-family:Arial,Helvetica,sans-serif">robert.osfield@gmail.com</a><span style="font-family:Arial,Helvetica,sans-serif">></span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">To: OpenSceneGraph Users <</span><a href="mailto:osg-users@lists.openscenegraph.org" target="_blank" style="font-family:Arial,Helvetica,sans-serif">osg-users@lists.openscenegraph.org</a><span style="font-family:Arial,Helvetica,sans-serif">></span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Subject: Re: [osg-users] Deep cloning an active root scene node</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Message-ID:</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">        <</span><a href="mailto:CAFN7Y%2BWMmVdWhgQJsnkoPvKo9zi3mWm149mrdGMhBUHxJpLtrw@mail.gmail.com" target="_blank" style="font-family:Arial,Helvetica,sans-serif">CAFN7Y+WMmVdWhgQJsnkoPvKo9zi3mWm149mrdGMhBUHxJpLtrw@mail.gmail.com</a><span style="font-family:Arial,Helvetica,sans-serif">></span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Content-Type: text/plain; charset="UTF-8"</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Hi Rob,</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">The OSG is design to allow you to rendering multiple views at once,</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">there is no need to clone the scene graph, you simply add another View</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">to a CompositeView to add the extra rendering.  You can toggle</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">optional View's on/off as you need them.</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Robert.</span>  <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Message: 7</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Date: Thu, 28 Feb 2019 14:20:46 -0330</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">From: Robert Lockyer <</span><a href="mailto:robert.lockyer@avalonholographics.com" target="_blank" style="font-family:Arial,Helvetica,sans-serif">robert.lockyer@avalonholographics.com</a><span style="font-family:Arial,Helvetica,sans-serif">></span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">To: </span><a href="mailto:osg-users@lists.openscenegraph.org" target="_blank" style="font-family:Arial,Helvetica,sans-serif">osg-users@lists.openscenegraph.org</a><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Subject: [osg-users] Deep cloning an active root scene node</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Message-ID:</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">        <CAGUte1dn64d=</span><a href="mailto:pcQXMrgQTShbQqDHKmdVcpd%2B09czFjNqb9JfZA@mail.gmail.com" target="_blank" style="font-family:Arial,Helvetica,sans-serif">pcQXMrgQTShbQqDHKmdVcpd+09czFjNqb9JfZA@mail.gmail.com</a><span style="font-family:Arial,Helvetica,sans-serif">></span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Content-Type: text/plain; charset="utf-8"</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Hi all, my name is Rob.</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">I'm currently writing a plugin for an OSG based application. I effectively</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">want to create a snapshot of the application's scene graph state and pass</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">it to another thread where I can render to a texture, while the main</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">rendering thread continues with minimal interruption.</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">I'd like to do this because blocking the main thread with a</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">osgViewer::Viewer::frame() call causes the application to lock up and</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">prevents me from displaying a progress dialog. The scene I render takes a</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">long time because I render many camera views to a single texture.</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">I'm currently trying to do this:</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">osg::Node* sceneCopy =</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">dynamic_cast<osg::Node*>(scene</span><span style="font-family:Arial,Helvetica,sans-serif">Data_->clone(osg::CopyOp::</span><span style="font-family:Arial,Helvetica,sans-serif">DEEP_COPY_ALL));</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Then passing this to another thread where I run:</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">viewer_ = new osgViewer::Viewer();</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">viewer_->setSceneData(sceneCop</span><span style="font-family:Arial,Helvetica,sans-serif">y);</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">However the behavior seems inconsistent. It either dies on a null reference</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">inside osgEarth somewhere or it renders an empty scene. I don't think I</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">fully understand the threading model of OSG, I've read a bit here and</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">there, but I think there's a lot I'm still missing.</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Is there a safe way to copy the scene data and use it to run an isolated</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">viewer like this in parallel? Is it even safe to run two viewers in</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">parallel like this at all?</span><br style="font-family:Arial,Helvetica,sans-serif"><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Cheers,</span><br style="font-family:Arial,Helvetica,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif">Rob</span>  <br></div><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font face="arial, helvetica, sans-serif">Robert Lockyer<br style="color:rgb(23,43,77)"><span style="color:rgb(23,43,77)">Software Developer<br></span><span style="color:rgb(23,43,77)"><img src="http://www.avalonholographics.com/wp-content/uploads/2018/11/logo.png" width="200" height="44"><br>Office: 1-709-701-</span><span style="color:rgb(23,43,77)">0281</span><br style="color:rgb(23,43,77)"><span style="color:rgb(23,43,77)">Email: </span><a href="mailto:robert.lockyer@avalonholographics.com" rel="nofollow" style="color:rgb(53,114,176)" target="_blank">robert.lockyer@avalonholographics.com</a></font><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>

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