Re: [osg-users] limit Camera display framerate
Hi Robert, On Friday 01 June 2007 18:05, Robert Osfield wrote: On 6/1/07, Emmanuel Roche [EMAIL PROTECTED] wrote: okay, and in this case, is it possible / tested to have multiple viewers on the same OpenGL Context ?... You can multiple views that share the same graphics context, but you'll need to use a single CompositeViewer for it to ensure that the threads are sycronized. You also need to realistic, frame rate is governed by the swap buffers of a window, when you do swap buffers all cameras drawing to that window have to redrawn, you can't selectively say I just want swap buffers on one cameras viewport on that window. Well, I can see an application of a frame rate limit for specific contexts. I would like to make mpeg movies from a running simulation with an existing viewer with one or more windows. The idea is to attach an additional pbuffer slave camera with a post render callback that converts the resulting image to yuv and writes it into a pipe to an external encoder program. Using an additional camera will ensure that you are free to resize the window that is displayed and that you do not rely on other windows not being on top of the opengl window. Obviously it is a waste of cpu/gpu power if this is done with 60 hz. Rendering with 30 hz - that is omitting every second frame - for that kind of slave camera would be good. Greetings Mathias -- Dr. Mathias Fröhlich, science + computing ag, Software Solutions Hagellocher Weg 71-75, D-72070 Tuebingen, Germany Phone: +49 7071 9457-268, Fax: +49 7071 9457-511 -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Dr. Florian Geyer, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Prof. Dr. Hanns Ruder Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196 ___ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
Re: [osg-users] limit Camera display framerate
Hi Mathias, If you used a FBO to capture the image then you could possible just embed the video recording camera into the viewer, and then use the node mask to switch it off when you don't need it. Alternatively, if you want a fixed frame rate that is decoupled from the main viewer then you might be forced to runa separate viewer with its own thread running its frame loop. You'll need a separate copy of the scene graph for this though. Actually this might even be best done a separate application that you can run in the background and just get it to watch the main apps view matrices and settings. As part of the core OSG's viewer library there is a limit on how much flexibility we can provide without ending up with a really convoluted API and implementation. Robert. On 6/4/07, Mathias Froehlich [EMAIL PROTECTED] wrote: Hi Robert, On Friday 01 June 2007 18:05, Robert Osfield wrote: On 6/1/07, Emmanuel Roche [EMAIL PROTECTED] wrote: okay, and in this case, is it possible / tested to have multiple viewers on the same OpenGL Context ?... You can multiple views that share the same graphics context, but you'll need to use a single CompositeViewer for it to ensure that the threads are sycronized. You also need to realistic, frame rate is governed by the swap buffers of a window, when you do swap buffers all cameras drawing to that window have to redrawn, you can't selectively say I just want swap buffers on one cameras viewport on that window. Well, I can see an application of a frame rate limit for specific contexts. I would like to make mpeg movies from a running simulation with an existing viewer with one or more windows. The idea is to attach an additional pbuffer slave camera with a post render callback that converts the resulting image to yuv and writes it into a pipe to an external encoder program. Using an additional camera will ensure that you are free to resize the window that is displayed and that you do not rely on other windows not being on top of the opengl window. Obviously it is a waste of cpu/gpu power if this is done with 60 hz. Rendering with 30 hz - that is omitting every second frame - for that kind of slave camera would be good. Greetings Mathias -- Dr. Mathias Fröhlich, science + computing ag, Software Solutions Hagellocher Weg 71-75, D-72070 Tuebingen, Germany Phone: +49 7071 9457-268, Fax: +49 7071 9457-511 -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Dr. Florian Geyer, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Prof. Dr. Hanns Ruder Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196 ___ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/ ___ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
Re: [osg-users] limit Camera display framerate
Hi Robert, On Monday 04 June 2007 10:33, Robert Osfield wrote: As part of the core OSG's viewer library there is a limit on how much flexibility we can provide without ending up with a really convoluted API and implementation. Sure. Is there any callback in the camera that can disable rendering in that case? Something like a callback that can omit every second frame or a quick way to disable such a camera completely every second frame together with an apropriate update callback for example? Are the node masks of these 'toplevel cameras' honoured, so that I just switch off that camera by a 0 node mask every other frame? Greetings Mathias -- Dr. Mathias Fröhlich, science + computing ag, Software Solutions Hagellocher Weg 71-75, D-72070 Tuebingen, Germany Phone: +49 7071 9457-268, Fax: +49 7071 9457-511 -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Dr. Florian Geyer, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Prof. Dr. Hanns Ruder Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196 ___ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
Re: [osg-users] limit Camera display framerate
HI Mathias,
On 6/4/07, Mathias Froehlich [EMAIL PROTECTED] wrote:
Is there any callback in the camera that can disable rendering in that case?
Something like a callback that can omit every second frame or a quick way to
disable such a camera completely every second frame together with an
apropriate update callback for example?
Are the node masks of these 'toplevel cameras' honoured, so that I just switch
off that camera by a 0 node mask every other frame?
The update callbacks on a camera won't be called (I think :-) if the
NodeMask is 0 so it wouldn't be suitable to doing the toggling.
You could do the toggling the main loop though, i.e.
while (!viewer.done())
{
camera1-setNodeMask(~camera1-setNodeMask());
viewer.frame();
}
Robert.
___
osg-users mailing list
osg-users@openscenegraph.net
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
Re: [osg-users] limit Camera display framerate
Hi Robert, On Monday 04 June 2007 11:09, Robert Osfield wrote: The update callbacks on a camera won't be called (I think :-) if the NodeMask is 0 so it wouldn't be suitable to doing the toggling. You could do the toggling the main loop though, i.e. Ok, I think I just need to play with that a bit ... Thanks! Greetings Mathias -- Dr. Mathias Fröhlich, science + computing ag, Software Solutions Hagellocher Weg 71-75, D-72070 Tuebingen, Germany Phone: +49 7071 9457-268, Fax: +49 7071 9457-511 -- Vorstand/Board of Management: Dr. Bernd Finkbeiner, Dr. Florian Geyer, Dr. Roland Niemeier, Dr. Arno Steitz, Dr. Ingrid Zech Vorsitzender des Aufsichtsrats/ Chairman of the Supervisory Board: Prof. Dr. Hanns Ruder Sitz/Registered Office: Tuebingen Registergericht/Registration Court: Stuttgart Registernummer/Commercial Register No.: HRB 382196 ___ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
Re: [osg-users] limit Camera display framerate
Hi Many,
You wouldn't limit the framerate of an osg::Camera, but you might
limit the frame rate of a Viewer. The way to do this right now is to
change the frame loop such the frame dispatch happens are a controlled
time. i.e.
while (!viewer.done())
{
myWaitTillNextFrameShoudlBegin();
viewer.frame();
}
Robert.
On 6/1/07, Emmanuel Roche [EMAIL PROTECTED] wrote:
Hello there,
has someone already try to limit the framerate for a given osg::Camera ?
In fact, just starting to use OSG 1.9, I would like to build a window with
multiple Camera on the same openGl context, but with different refresh
rate... is this possible ? and what would be the better starting point ? an
osgCompositeViewer or and ordinary osgViewer is enough ?
thanks for your help !
Manu.
___
osg-users mailing list
osg-users@openscenegraph.net
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
___
osg-users mailing list
osg-users@openscenegraph.net
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
Re: [osg-users] limit Camera display framerate
okay, and in this case, is it possible / tested to have multiple viewers on
the same OpenGL Context ?...
2007/6/1, Robert Osfield [EMAIL PROTECTED]:
Hi Many,
You wouldn't limit the framerate of an osg::Camera, but you might
limit the frame rate of a Viewer. The way to do this right now is to
change the frame loop such the frame dispatch happens are a controlled
time. i.e.
while (!viewer.done())
{
myWaitTillNextFrameShoudlBegin();
viewer.frame();
}
Robert.
On 6/1/07, Emmanuel Roche [EMAIL PROTECTED] wrote:
Hello there,
has someone already try to limit the framerate for a given osg::Camera ?
In fact, just starting to use OSG 1.9, I would like to build a window
with
multiple Camera on the same openGl context, but with different refresh
rate... is this possible ? and what would be the better starting point ?
an
osgCompositeViewer or and ordinary osgViewer is enough ?
thanks for your help !
Manu.
___
osg-users mailing list
osg-users@openscenegraph.net
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
___
osg-users mailing list
osg-users@openscenegraph.net
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
___
osg-users mailing list
osg-users@openscenegraph.net
http://openscenegraph.net/mailman/listinfo/osg-users
http://www.openscenegraph.org/
Re: [osg-users] limit Camera display framerate
Yes I see what you mean, but until now I've managed to use a context this wait with multiple osgUtil::SceneViews : you just need to be sure that those sceneviews don't overlap, then you may have a main view with a normal frame rate and auxiliary views changed only once per second for example... To be honest, I don't think this is a good solution in fact :-) It would be a lot more appropriate (I guess ?) to use a render to texture system to build small textures updated at the needed rate and apply those textures on small quads... But I must admit I haven't take the time to look at this updated solution yet :-) Manu. 2007/6/1, Robert Osfield [EMAIL PROTECTED]: On 6/1/07, Emmanuel Roche [EMAIL PROTECTED] wrote: okay, and in this case, is it possible / tested to have multiple viewers on the same OpenGL Context ?... You can multiple views that share the same graphics context, but you'll need to use a single CompositeViewer for it to ensure that the threads are sycronized. You also need to realistic, frame rate is governed by the swap buffers of a window, when you do swap buffers all cameras drawing to that window have to redrawn, you can't selectively say I just want swap buffers on one cameras viewport on that window. Robert. ___ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/ ___ osg-users mailing list osg-users@openscenegraph.net http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
