Yes, just thinks like Maximise, Minimise, Resize. I also rendered on "Activate" in case the form lost and regained focus.
There's no problems integrating OSG with .NET Windows Forms from what I can see. On Tue, Nov 10, 2009 at 4:11 PM, Todd J. Furlong <t...@inv3rsion.com> wrote: > Thanks for the responses. > > Ruben: That sounds like a robust way to handle threading issues. We do > something similar in VR Juggler based applications where one thread receives > input but many have to render. > > Andrew: Did you have to hook up a lot of UI events to get your scene to > refresh during window relocation, etc? We considered not rendering > continuously to get around ToolTip transparency issues, but it seemed like > it might be complicated to get the control to render when it needs to. > > -Todd > > > On 11/10/2009 10:56 AM, Andrew Burnett-Thompson wrote: > >> Hi there, >> >> I'm doing something very similar - OSG hosted in .NET. The way I've done >> this is I have my render thread running in a loop and instead of >> rendering continuously, I have a Stack<RenderArgs> hosted in the OSG >> .NET control. Then if I want to render, I push a RenderArgs onto the >> stack. >> >> Inside the render thread, I check if there is an item in the stack, if >> so, pop it out and render. >> >> That way I have control over rendering (I only render when I need to in >> my app, as its a visualisation and doesn't need to run continuously). >> >> Also in the render thread, if there are no stack objects I will >> Thread.Sleep(1) to pause the render thread for 1ms (The minimum allowed >> time). >> >> This is just one solution. You could alternatively call frame directly >> and just use some object to handle the thread locking (Lock keyword in >> C# or Monitor::Enter/Exit in C++/CLI). Calling frame from within >> MainForm_Paint is not that bad an idea, I've donet his myself for >> DirectX visualisation applications before. >> >> Cheers, >> Andrew >> >> On Tue, Nov 10, 2009 at 3:48 PM, Smelik, R.M. (Ruben) >> <ruben.sme...@tno.nl <mailto:ruben.sme...@tno.nl>> wrote: >> >> Hi Todd, >> >> I've had the same choices to make for my .NET / OSG program. I'm not >> sure whether or not the .NET timer / Invalidate is a stable >> approach, FYI I'll just explain the solution I've chosen. >> To avoid all the mutexes and threading issues, I went for a very >> simple solution. A render thread loops to call frame() and a UI >> thread processes user actions. Changes to the scene graph are made >> in two steps: >> >> * The UI thread sets a flag indicating what kind of change to the >> scenegraph is required; >> * Each iteration, the render threads checks (and clears) all flags >> and makes the required scenegraph changes before calling frame(). >> >> Of course, depending on your application, this can be kind of >> awkward (although you can replace flags with more detailed >> "modification objects" containing loaded models etc.). >> >> Kind regards, >> >> Ruben >> >> ________________________________ >> >> From: osg-users-boun...@lists.openscenegraph.org >> <mailto:osg-users-boun...@lists.openscenegraph.org> on behalf of >> >> Todd J. Furlong >> Sent: Tue 11/10/2009 4:11 PM >> To: OpenSceneGraph Users >> Subject: [osg-users] OsgViewer and Windows Forms >> >> >> >> I have a .NET Windows Forms application with 2 OSG-based classes: >> 1. A UserControl/OsgViewer based class, and >> 2. An OSG-based "engine" that handles file loading, scenegraph mods, >> etc. >> >> The .NET example from the OSG website gets the viewer initialized: >> >> http://www.openscenegraph.org/projects/osg/wiki/Support/FAQ#HowdoIembedanOSGviewerina.NETcontrol >> >> My question is: What is the best way to call the viewer frame function >> in this application? >> >> I have tried updating the viewer in a new thread. It appears to >> perform >> well, but it presents thread safety problems because my scenegraph >> modifications (from the "engine") mostly take place in the UI thread >> (button press events, etc). I can simplify the engine code (avoid >> mutexes around function calls) if I can get the viewer to update on >> that >> thread. >> >> To move the viewer onto the UI thread, I am calling the viewer frame >> function in an override of the OnPaint method of the UserControl class. >> I've created a Forms timer that periodically calls Invalidate on the >> UserControl to make sure OnPaint is called with some regularity. >> Other >> timer-related code insures that the Invalidate call isn't made at a >> greater frequency than we expect the viewer to be able to render. It >> appears to be working OK, but I'm worried that this approach will be >> fragile as we run this application on different systems with different >> scene contents. >> >> Comments or suggestions? >> >> Thanks, >> Todd >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> <mailto:osg-users@lists.openscenegraph.org> >> >> >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> < >> https://tnoportal.tno.nl/listinfo.cgi/,DanaInfo=lists.openscenegraph.org+osg-users-openscenegraph.org >> > >> >> >> This e-mail and its contents are subject to the DISCLAIMER at >> http://www.tno.nl/disclaimer/email.html >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> <mailto:osg-users@lists.openscenegraph.org> >> >> >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> >> >> >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > > -- > Todd J. Furlong > Inv3rsion, LLC > http://www.inv3rsion.com > 888-588-0573 x701 office > 603-759-9035 mobile > 888-588-0573 fax > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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