Re: [osg-users] Slave cameras in a view

2007-10-17 Thread Karl Heijdenberg 
Hi and thanks for the tip about where to look for code for the
projectionOffset. I now have a slave camera with the expected projection
offset next to the master camera.

One thing that I found out was that the slave camera is drawn one frame
after the master. Both cameras are drawn to the same graphics context. I can
easily see this in the seam between the two cameras by moving my scene up or
down at a constant speed. My slave camera is then drawn a at a constant
distance behind my master camera.

In the osgwindow example separate graphics contexts are used for master and
slave cameras. Is that the way it should be done? And then why?

If I set up the two cameras with different graphics contexts they draw
within the same frame (when I use the thread per context threading model).

Regards Karl


On 10/15/07, Robert Osfield [EMAIL PROTECTED] wrote:

 Hi Karl,

 Have a look at the osgwindows example, or the
 View::setUpViewAcrossScreens() source code in
 src/osgViewer/Viewer.cpp.

 On 10/10/07, Karl Heijdenberg [EMAIL PROTECTED] wrote:
  Hi,
 
  I'm trying to add two cameras to one View in compositeViewer.
  The first camera is added as a master camera and the second as a slave
  camera.
 
  Frustums for the cameras:
  master={-50, 0, -40, 40}
   slave={0, 50, -40, 40}
 
  For the first camera I set the projectionMatrix with
  setProjectionMatrixAsFrustum.
 
  How do I calculate the projectionOffset for the slave camera?
 
  The offset is needed in call to addSlave(osg::Camera* camera,const
  osg::Matrix projectionOffset, const osg::Matrix viewOffset, bool
  useMastersSceneData=true);
 
  I've also tried to set the reference frame to
 ABSOLUTE_RF_INHERIT_VIEWPOINT
  and then call the setProjectionMatrixAsFrustum for both cameras. This
 test
  ended up in a black scene for the second camera. Am I missing something?
 
  Thanks, Karl
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Re: [osg-users] Slave cameras in a view

2007-10-17 Thread Robert Osfield 
Hi Karl,

The master and slave cameras will be drawn in the same frame.

If you see a difference then it must be down to the propagation of the
settings from the master to the slave being out of sync.  I don't know
how you set the master, perhaps you are setting it after the sync
point.  The View::updateSlaves() method that does this sync is called
from within Viewer::updateTraversals() so perhaps you are setting the
master camera after this.

Robert.

On 10/17/07, Karl Heijdenberg [EMAIL PROTECTED] wrote:
 Hi and thanks for the tip about where to look for code for the
 projectionOffset. I now have a slave camera with the expected projection
 offset next to the master camera.

 One thing that I found out was that the slave camera is drawn one frame
 after the master. Both cameras are drawn to the same graphics context. I can
 easily see this in the seam between the two cameras by moving my scene up or
 down at a constant speed. My slave camera is then drawn a at a constant
 distance behind my master camera.

 In the osgwindow example separate graphics contexts are used for master and
 slave cameras. Is that the way it should be done? And then why?

 If I set up the two cameras with different graphics contexts they draw
 within the same frame (when I use the thread per context threading model).

 Regards Karl



 On 10/15/07, Robert Osfield [EMAIL PROTECTED] wrote:
 
  Hi Karl,
 
  Have a look at the osgwindows example, or the
  View::setUpViewAcrossScreens() source code in
  src/osgViewer/Viewer.cpp.
 
  On 10/10/07, Karl Heijdenberg  [EMAIL PROTECTED] wrote:
   Hi,
  
   I'm trying to add two cameras to one View in compositeViewer.
   The first camera is added as a master camera and the second as a slave
   camera.
  
   Frustums for the cameras:
   master={-50, 0, -40, 40}
slave={0, 50, -40, 40}
  
   For the first camera I set the projectionMatrix with
   setProjectionMatrixAsFrustum.
  
   How do I calculate the projectionOffset for the slave camera?
  
   The offset is needed in call to addSlave(osg::Camera* camera,const
   osg::Matrix projectionOffset, const osg::Matrix viewOffset, bool
   useMastersSceneData=true);
  
   I've also tried to set the reference frame to
 ABSOLUTE_RF_INHERIT_VIEWPOINT
   and then call the setProjectionMatrixAsFrustum for both cameras. This
 test
   ended up in a black scene for the second camera. Am I missing something?
  
   Thanks, Karl
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 http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
  
  
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Re: [osg-users] Slave cameras in a view

2007-10-17 Thread Karl Heijdenberg 
Ah, thanks a lot :-)

Of course that was the reason! Thats also explains why it worked with
different contexts.

Thanks Karl


On 10/17/07, Robert Osfield [EMAIL PROTECTED] wrote:

 Hi Karl,

 The master and slave cameras will be drawn in the same frame.

 If you see a difference then it must be down to the propagation of the
 settings from the master to the slave being out of sync.  I don't know
 how you set the master, perhaps you are setting it after the sync
 point.  The View::updateSlaves() method that does this sync is called
 from within Viewer::updateTraversals() so perhaps you are setting the
 master camera after this.

 Robert.

 On 10/17/07, Karl Heijdenberg [EMAIL PROTECTED] wrote:
  Hi and thanks for the tip about where to look for code for the
  projectionOffset. I now have a slave camera with the expected projection
  offset next to the master camera.
 
  One thing that I found out was that the slave camera is drawn one frame
  after the master. Both cameras are drawn to the same graphics context. I
 can
  easily see this in the seam between the two cameras by moving my scene
 up or
  down at a constant speed. My slave camera is then drawn a at a constant
  distance behind my master camera.
 
  In the osgwindow example separate graphics contexts are used for master
 and
  slave cameras. Is that the way it should be done? And then why?
 
  If I set up the two cameras with different graphics contexts they draw
  within the same frame (when I use the thread per context threading
 model).
 
  Regards Karl
 
 
 
  On 10/15/07, Robert Osfield [EMAIL PROTECTED] wrote:
  
   Hi Karl,
  
   Have a look at the osgwindows example, or the
   View::setUpViewAcrossScreens() source code in
   src/osgViewer/Viewer.cpp.
  
   On 10/10/07, Karl Heijdenberg  [EMAIL PROTECTED] wrote:
Hi,
   
I'm trying to add two cameras to one View in compositeViewer.
The first camera is added as a master camera and the second as a
 slave
camera.
   
Frustums for the cameras:
master={-50, 0, -40, 40}
 slave={0, 50, -40, 40}
   
For the first camera I set the projectionMatrix with
setProjectionMatrixAsFrustum.
   
How do I calculate the projectionOffset for the slave camera?
   
The offset is needed in call to addSlave(osg::Camera* camera,const
osg::Matrix projectionOffset, const osg::Matrix viewOffset, bool
useMastersSceneData=true);
   
I've also tried to set the reference frame to
  ABSOLUTE_RF_INHERIT_VIEWPOINT
and then call the setProjectionMatrixAsFrustum for both cameras.
 This
  test
ended up in a black scene for the second camera. Am I missing
 something?
   
Thanks, Karl
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Re: [osg-users] Slave cameras in a view

2007-10-15 Thread Robert Osfield 
Hi Karl,

Have a look at the osgwindows example, or the
View::setUpViewAcrossScreens() source code in
src/osgViewer/Viewer.cpp.

On 10/10/07, Karl Heijdenberg [EMAIL PROTECTED] wrote:
 Hi,

 I'm trying to add two cameras to one View in compositeViewer.
 The first camera is added as a master camera and the second as a slave
 camera.

 Frustums for the cameras:
 master={-50, 0, -40, 40}
  slave={0, 50, -40, 40}

 For the first camera I set the projectionMatrix with
 setProjectionMatrixAsFrustum.

 How do I calculate the projectionOffset for the slave camera?

 The offset is needed in call to addSlave(osg::Camera* camera,const
 osg::Matrix projectionOffset, const osg::Matrix viewOffset, bool
 useMastersSceneData=true);

 I've also tried to set the reference frame to ABSOLUTE_RF_INHERIT_VIEWPOINT
 and then call the setProjectionMatrixAsFrustum for both cameras. This test
 ended up in a black scene for the second camera. Am I missing something?

 Thanks, Karl
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[osg-users] Slave cameras in a view

2007-10-10 Thread Karl Heijdenberg 
Hi,

I'm trying to add two cameras to one View in compositeViewer.
The first camera is added as a master camera and the second as a slave
camera.

Frustums for the cameras:
master={-50, 0, -40, 40}
slave={0, 50, -40, 40}

For the first camera I set the projectionMatrix with
setProjectionMatrixAsFrustum.

How do I calculate the projectionOffset for the slave camera?

The offset is needed in call to addSlave(osg::Camera* camera,const
osg::Matrix projectionOffset, const osg::Matrix viewOffset, bool
useMastersSceneData=true);

I've also tried to set the reference frame to ABSOLUTE_RF_INHERIT_VIEWPOINT
and then call the setProjectionMatrixAsFrustum for both cameras. This test
ended up in a black scene for the second camera. Am I missing something?

Thanks, Karl
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Re: [osg-users] Slave cameras in a view

2007-10-10 Thread Karl Heijdenberg 
Thanks David for your try to help.

The reply didn't answer to the question about how to calculate the
projectionOffset for slave cameras. How to?


On 10/10/07, David Callu [EMAIL PROTECTED] wrote:

 Hi Karl


 2007/10/10, Karl Heijdenberg [EMAIL PROTECTED]:
 
  Hi,
 
  I'm trying to add two cameras to one View in compositeViewer.
  The first camera is added as a master camera and the second as a slave
  camera.


 other correct me if I am wrong, frustum is map on interval [0,
 XWindowSize] and [0, YWindowSize]


That is the interval values of the viewport for the camera in the view.

Frustums for the cameras:
  master={-50, 0, -40, 40}
  slave={0, 50, -40, 40}


I use near=1 and far=100

For the first camera I set the projectionMatrix with
  setProjectionMatrixAsFrustum.


I give these required arguments to the setProjectionMatrixAsFrustum method
(for the master cam):

{left,right,bottom,top,near,far} = {tan(degToRad(-50)) * near, tan(degToRad(0))
* near, tan(degToRad(-40)) * near, tan(degToRad(40)) * near, near, far}


 How do I calculate the projectionOffset for the slave camera?


This is the question I'm interested in a good answer to!

during update of camera position, the projection matrix for slaveis compute
 as this
 slaveCamera-setProjectionMatrix( masterCamera-getProjectionMatrix() *
 slaveCamera-getProjectionOffset() );
 idem for the view matrix and the viewOffset.


 The offset is needed in call to addSlave(osg::Camera* camera,const
  osg::Matrix projectionOffset, const osg::Matrix viewOffset, bool
  useMastersSceneData=true);
 
  I've also tried to set the reference frame to
  ABSOLUTE_RF_INHERIT_VIEWPOINT and then call the setProjectionMatrixAsFrustum
  for both cameras. This test ended up in a black scene for the second camera.
  Am I missing something?
 
  Thanks, Karl
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 HTH
 David

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Regards Karl
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