The OpenSG Scenegraph

Hi,

put it in a customized foreground, in the worst cast you have to generate
the n cluster windows yourself  (not using MultiDisplay) each with a
different foreground containing the parameters per pipe. I have to do
this over here as our curved screen needs different cameras settings
per pipe, so I create the 3 cluster windows myself and provide them
with different camera decorators setup according to our configuration.

gerrit


On Thu, 2003-09-25 at 06:22, Akos Balazs wrote:
> Hi guys,
> 
> After my image is rendered on the clusterServers I'd like to do further
> OpenGL rendering in the server windows. I've tried to do it by adding my
> OpenGL commands after the call to server->render(ract) in
> `testClusterServer.cpp', but it didn't seem to work.
> 
> Looking at the source code for `OSGClusterServer.cpp' it seems that
> immediately after performing the rendering it swaps the buffers, and thus
> my additional OpenGL stuff will always be rendered into the backbuffer
> making it pretty much unusable... :(
> 
> Is there a way around it (possibly without changing the source code to
> `OSGClusterServer.cpp' :), or it's just not supported, or it's not
> recommended, or whatever? :-)
> 
> In case you're wondering I'd like to add ``edge-blends'' to the servers
> running on our Powerwall.
> 
> Thanks,
> 	Akos
> 
> 
> 
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On Thu, Sep 25, 2003 at 12:22:29AM +0200, Akos Balazs wrote:
> Hi guys,
> 
> After my image is rendered on the clusterServers I'd like to do further
> OpenGL rendering in the server windows. I've tried to do it by adding my
> OpenGL commands after the call to server->render(ract) in
> `testClusterServer.cpp', but it didn't seem to work.
> 
> Looking at the source code for `OSGClusterServer.cpp' it seems that
> immediately after performing the rendering it swaps the buffers, and thus
> my additional OpenGL stuff will always be rendered into the backbuffer
> making it pretty much unusable... :(
> 
> Is there a way around it (possibly without changing the source code to
> `OSGClusterServer.cpp' :), or it's just not supported, or it's not
> recommended, or whatever? :-)
> 
> In case you're wondering I'd like to add ``edge-blends'' to the servers
> running on our Powerwall.

Hi Akos,

since edge-blending is a common feature in powerwall environments you
might be not to much supprised that someone already has a working 
implementation.
It works by a small extension to the OSGMultiDisplayWindow. I hope this
will be part of the new release but I can send you the code if you're
interested.

	Manfred.

======================================================================
Manfred Weiler              Manfred.Weiler@...
Visualisierung und Interaktive Systeme          Telefon: 0711/7816-208
Universitaet Stuttgart, IfI                         FAX: 0711/7816-340

On Thu, 2003-09-25 at 09:53, Manfred Weiler wrote:
> On Thu, Sep 25, 2003 at 12:22:29AM +0200, Akos Balazs wrote:
> > Hi guys,
> > 
> > After my image is rendered on the clusterServers I'd like to do further
> > OpenGL rendering in the server windows. I've tried to do it by adding my
> > OpenGL commands after the call to server->render(ract) in
> > `testClusterServer.cpp', but it didn't seem to work.
> > 
> > Looking at the source code for `OSGClusterServer.cpp' it seems that
> > immediately after performing the rendering it swaps the buffers, and thus
> > my additional OpenGL stuff will always be rendered into the backbuffer
> > making it pretty much unusable... :(
> > 
> > Is there a way around it (possibly without changing the source code to
> > `OSGClusterServer.cpp' :), or it's just not supported, or it's not
> > recommended, or whatever? :-)
> > 
> > In case you're wondering I'd like to add ``edge-blends'' to the servers
> > running on our Powerwall.
> 
> Hi Akos,
> 
> since edge-blending is a common feature in powerwall environments you
> might be not to much supprised that someone already has a working 
> implementation.
> It works by a small extension to the OSGMultiDisplayWindow. I hope this
> will be part of the new release but I can send you the code if you're
> interested.

Why not send it to the list? ;-)


/Rasmus

-- 
Rasmus Agerholm

Research Assistant
VR Media Lab		(+45) 9635 8792
Niels Jernes Vej 14
DK-9220 Aalborg

Phone: (+45) 9635 8784
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http://www.vrmedialab.dk/~rasta

> > Hi Akos,
> > 
> > since edge-blending is a common feature in powerwall environments you
> > might be not to much supprised that someone already has a working 
> > implementation.
> > It works by a small extension to the OSGMultiDisplayWindow. I hope this
> > will be part of the new release but I can send you the code if you're
> > interested.
> 
> Why not send it to the list? ;-)

OK, if you insist ;-) Maybe this will also solve the problem of 
"integration" into the OpenSG cvs tree. :)

To use it you will only have to modify the testClusterClient:

#ifndef USE_MY_MULTIDISPLAY
	        multidisplay=MultiDisplayWindow::create();
#else
		{
		    MyMultiDisplayWindowPtr md = MyMultiDisplayWindow::create();
		    md->setXOverlap(xoverlap);
		    md->setYOverlap(yoverlap);
		    multidisplay = md;
		}
#endif		

The overlap is specified in pixels and can be either positiv or negative.

Gruss
	Manfred.

======================================================================
Manfred Weiler              Manfred.Weiler@...
Visualisierung und Interaktive Systeme          Telefon: 0711/7816-208
Universitaet Stuttgart, IfI                         FAX: 0711/7816-340

Hi,


Akos Balazs wrote:

>Hi guys,
>
>After my image is rendered on the clusterServers I'd like to do further
>OpenGL rendering in the server windows. I've tried to do it by adding my
>OpenGL commands after the call to server->render(ract) in
>`testClusterServer.cpp', but it didn't seem to work.
>
>Looking at the source code for `OSGClusterServer.cpp' it seems that
>immediately after performing the rendering it swaps the buffers, and thus
>my additional OpenGL stuff will always be rendered into the backbuffer
>making it pretty much unusable... :(
>  
>
It is possible to call

server->doSync(false);
server->doRender(),

your own gl commands

server->doSwap();

>Is there a way around it (possibly without changing the source code to
>`OSGClusterServer.cpp' :), or it's just not supported, or it's not
>recommended, or whatever? :-)
>
>In case you're wondering I'd like to add ``edge-blends'' to the servers
>running on our Powerwall.
>  
>
It is possible to use a TileDecorator to get overlapping viewports.It is 
not neccessary to change the server. On the Client-Side
create two viewports. the first form 0 to 0.5 the second from 0.5 to 1. 
Then add a TileDecorator to the two viewports. With this it is
possible to set the visible area for each Viewport.



>Thanks,
>	Akos
>
>  
>
Hope this helps

Marcus

>
>-------------------------------------------------------
>This sf.net email is sponsored by:ThinkGeek
>Welcome to geek heaven.
>http://thinkgeek.com/sf
>_______________________________________________
>Opensg-users mailing list
>Opensg-users@...
>https://lists.sourceforge.net/lists/listinfo/opensg-users
>  
>

Hi,

On Thu, 2003-09-25 at 16:22, Manfred Weiler wrote:
> > > Hi Akos,
> > > 
> > > since edge-blending is a common feature in powerwall environments you
> > > might be not to much supprised that someone already has a working 
> > > implementation.
> > > It works by a small extension to the OSGMultiDisplayWindow. I hope this
> > > will be part of the new release but I can send you the code if you're
> > > interested.
> > 
> > Why not send it to the list? ;-)
> 
> OK, if you insist ;-) Maybe this will also solve the problem of 
> "integration" into the OpenSG cvs tree. :)

it maybe would if you had included the .cpp files too ;-)

gerrit

Hi Marcus,

On Thu, 25 Sep 2003, Marcus Roth wrote:

> Akos Balazs wrote:
>
> >After my image is rendered on the clusterServers I'd like to do further
> >OpenGL rendering in the server windows. I've tried to do it by adding
> >my OpenGL commands after the call to server->render(ract) in
> >`testClusterServer.cpp', but it didn't seem to work.
> >
> >Looking at the source code for `OSGClusterServer.cpp' it seems that
> >immediately after performing the rendering it swaps the buffers, and
> >thus my additional OpenGL stuff will always be rendered into the
> >backbuffer making it pretty much unusable... :(
> >
> >
> It is possible to call
>
> server->doSync(false);
> server->doRender(),
>
> your own gl commands
>
> server->doSwap();

I think this is just what I was looking for, thanks. :-) I wasn't aware
that these are actually public methods, must have been really late
yesterday evening. :)

> >Is there a way around it (possibly without changing the source code to
> >`OSGClusterServer.cpp' :), or it's just not supported, or it's not
> >recommended, or whatever? :-)
> >
> >In case you're wondering I'd like to add ``edge-blends'' to the servers
> >running on our Powerwall.
> >
> >
> It is possible to use a TileDecorator to get overlapping viewports.It is
> not neccessary to change the server. On the Client-Side create two
> viewports. the first form 0 to 0.5 the second from 0.5 to 1.  Then add a
> TileDecorator to the two viewports. With this it is possible to set the
> visible area for each Viewport.

I'd like to keep using the MultiDisplayWindow, it keeps things more
simple. I've already extended it to handle X overlays, similarly to
Manfred's implementation.

Thanks,
	Akos

On Thu, Sep 25, 2003 at 04:52:01PM +0800, Gerrit Voss wrote:
> 
> Hi,
> 
> On Thu, 2003-09-25 at 16:22, Manfred Weiler wrote:
> > > > Hi Akos,
> > > > 
> > > > since edge-blending is a common feature in powerwall environments you
> > > > might be not to much supprised that someone already has a working 
> > > > implementation.
> > > > It works by a small extension to the OSGMultiDisplayWindow. I hope this
> > > > will be part of the new release but I can send you the code if you're
> > > > interested.
> > > 
> > > Why not send it to the list? ;-)
> > 
> > OK, if you insist ;-) Maybe this will also solve the problem of 
> > "integration" into the OpenSG cvs tree. :)
> 
> it maybe would if you had included the .cpp files too ;-)

Very good point, indeed.

Gruss
	Manfred.

======================================================================
Manfred Weiler              Manfred.Weiler@...
Visualisierung und Interaktive Systeme          Telefon: 0711/7816-208
Universitaet Stuttgart, IfI                         FAX: 0711/7816-340

Hi folks,

On Thu, 2003-09-25 at 03:29, Marcus Roth wrote:
> >
> It is possible to use a TileDecorator to get overlapping viewports.It is 
> not neccessary to change the server. On the Client-Side
> create two viewports. the first form 0 to 0.5 the second from 0.5 to 1. 
> Then add a TileDecorator to the two viewports. With this it is
> possible to set the visible area for each Viewport.

while that is true, edge blending is something that many people need,
thus I think it would be good if we could integrate that into the core.
And given that Manfred already sent the code it should be pretty simple.
;) I would do it in a derived MultiDisplayWindow, and optionally add an
edge blending texture, too. 

Can you do that Marcus or should I? It might take me a little longer
than you probably, though. ;)

	Dirk

-- 
-- Dirk Reiners               OpenSG Forum               dirk@...
-- The OpenSG Open Source Scenegraph:              http://www.opensg.org
-- Announcements:     http://lists.sf.net/lists/listinfo/opensg-announce

Hi,

Dirk Reiners wrote:

>	Hi folks,
>
>On Thu, 2003-09-25 at 03:29, Marcus Roth wrote:
>  
>
>>It is possible to use a TileDecorator to get overlapping viewports.It is 
>>not neccessary to change the server. On the Client-Side
>>create two viewports. the first form 0 to 0.5 the second from 0.5 to 1. 
>>Then add a TileDecorator to the two viewports. With this it is
>>possible to set the visible area for each Viewport.
>>    
>>
>
>while that is true, edge blending is something that many people need,
>thus I think it would be good if we could integrate that into the core.
>And given that Manfred already sent the code it should be pretty simple.
>;) I would do it in a derived MultiDisplayWindow, and optionally add an
>edge blending texture, too. 
>
>Can you do that Marcus or should I? It might take me a little longer
>than you probably, though. ;)
>
>	Dirk
>  
>
I'll try to do it next week, but I would prefere to integrate the code 
from Manfred into the current MultidisplayWindow and set the default for
xOverlap and yOverlap to zero.

Marcus

Hi Marcus,

On Thu, 2003-10-02 at 04:04, Marcus Roth wrote:
> Hi,

> I'll try to do it next week, but I would prefere to integrate the code 
> from Manfred into the current MultidisplayWindow and set the default for
> xOverlap and yOverlap to zero.

hmm, I would also like to add some edge blending capabilities, would you
put them in the base MultiWindow, too? 

Have a nice weekend

	Dirk

-- 
-- Dirk Reiners               OpenSG Forum               dirk@...
-- The OpenSG Open Source Scenegraph:              http://www.opensg.org
-- Announcements:     http://lists.sf.net/lists/listinfo/opensg-announce

Hi Folks,

for those who are interessed. I have just added a new release of the 
OpenSG PLUS volume rendering library to the berlios CVS tree.

The new features include extended shader functionality exploiting 
in particular ARB_fragment_program capabilities and volume clipping
functionality. I have added quite some test programs demonstrating 
the functionality. 

Give me a note if you have any problems compiling or running the libray.

	Manfred.

======================================================================
Manfred Weiler              Manfred.Weiler@...
Visualisierung und Interaktive Systeme          Telefon: 0711/7816-208
Universitaet Stuttgart, IfI                         FAX: 0711/7816-340