[osg-users] default coordinate system and camera - newbie
Hello Paul,
I have made the following changes, still having the same value:
***
int main()
{
//Creating the viewer
osgViewer::Viewer viewer ;
*viewer.setCameraManipulator(new osgGA::TrackballManipulator());*
//add some event handler
//to show the statistics
viewer.addEventHandler(new osgViewer::StatsHandler);
/*
get camera related information
*/
osg::Vec3f eye;
osg::Vec3f dir;
osg::Vec3f up;
viewer.getCamera()-getViewMatrixAsLookAt(eye,dir,up);
cout The eye vector: eye.x() eye.y()
eye.z() endl;
cout The look at position: dir.x() dir.y()
dir.z() endl;
cout The up vector is: up.x() up.y() up.z()
endl;
***
-- Forwarded message --
From: ami guru dosto.wa...@gmail.com
Date: Thu, Apr 2, 2009 at 2:39 AM
Subject: Fwd: [osg-users] default coordinate system and camera - newbie
To: OpenSceneGraph Users osg-users@lists.openscenegraph.org
Hello Paul,
I have the following snippet that deals with the viewer
**'
int main()
{
//Creating the viewer
osgViewer::Viewer viewer ;
//add some event handler
//to show the statistics
viewer.addEventHandler(new osgViewer::StatsHandler);
/*
get camera related information
*/
osg::Vec3f eye;
osg::Vec3f dir;
osg::Vec3f up;
viewer.getCamera()-getViewMatrixAsLookAt(eye,dir,up);
cout The eye vector: eye.x() eye.y()
eye.z() endl;
cout The look at position: dir.x() dir.y()
dir.z() endl;
cout The up vector is: up.x() up.y() up.z()
endl;
//Creating the root node
osg::ref_ptrosg::Node root = createSceneGraph();
'**
Could you provide some hint where the bug might be , at least the way to
find it?
I want to implement a very simple scenario. A camera that moves along with
the key press event.
I already have that implemented in OpenGL program where i can roll, pitch
yaw and slide with user key press event.
I want to map that in the scene graph system.
I have the following information predefined
*n* = eye - look;
*u* = *up* * *n*;
*v* = *n* * *u*;
To move the camera in an ineractive way i have to have the access to there
values .
there is a function in the Camera Class called getViewMatrix() , i hope that
it is one to access these values.
Any more reference would be of great help.
-- Forwarded message --
From: Paul Martz pma...@skew-matrix.com
Date: 2009/4/2
Subject: Re: [osg-users] default coordinate system and camera - newbie
To: OpenSceneGraph Users osg-users@lists.openscenegraph.org
The CameraManipulator (like TrackballManipulator, for example) determines
the default orientation. You can change this default by setting the up
vector in the TrackballManipulator. By default, the TrackballManipulator
uses positive Z up, so if your code is getting positive Y up, either you
have a bug or you are not using the TrackballManipulator or you have changed
its default.
The default view position is also determined by the CameraManipulator. The
TrackballManipulator, for example, has a home position that you can set. By
default, it considers the scene bounding volume and tries to position the
view so that the entire scene fits within a 50 degree FOV (I think it's 50,
not sure).
Paul Martz
*Skew Matrix Software LLC*
http://www.skew-matrix.com
+1 303 859 9466
--
*From:* osg-users-boun...@lists.openscenegraph.org [mailto:
osg-users-boun...@lists.openscenegraph.org] *On Behalf Of *ami guru
*Sent:* Wednesday, April 01, 2009 1:58 PM
*To:* OpenSceneGraph Users
*Subject:* [osg-users] default coordinate system and camera - newbie
Hello forum,
osgViewer , by default uses the world coordinate system that is oriented
with positive X to right , positive Z up, and positive Y into the screen.
Does that mean the camera' s defualt position is at the origin looking down
into the screen which is positive Y?
I have tried to extract the vectors using the function
'
osg::Vec3f eye;
osg::Vec3f dir;
osg::Vec3f up;
viewer.getCamera()-getViewMatrixAsLookAt(eye,dir,up);
cout The eye vector: eye.x() eye.y()
eye.z() endl;
cout The look at position: dir.x() dir.y()
dir.z() endl;
cout The up vector is: up.x() up.y() up.z()
endl;
The eye vector: 0 0 0
The look at position: 0 0 -1
The up vector is: 0 1 0
I was wondering if the up vector be Z axis instead
Regards
Sajjad
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg
Re: [osg-users] default coordinate system and camera - newbie
My guess is that, at the time you do the query, you haven't rendered a frame
yet. If so, the Viewer object hasn't queried the manipulator matrix yet. You
have the source code, so you can easily verify this with a debugger.
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com http://www.skew-matrix.com/
+1 303 859 9466
_
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of ami guru
Sent: Thursday, April 02, 2009 8:05 AM
To: OpenSceneGraph Users
Subject: [osg-users] default coordinate system and camera - newbie
Hello Paul,
I have made the following changes, still having the same value:
***
int main()
{
//Creating the viewer
osgViewer::Viewer viewer ;
viewer.setCameraManipulator(new osgGA::TrackballManipulator());
//add some event handler
//to show the statistics
viewer.addEventHandler(new osgViewer::StatsHandler);
/*
get camera related information
*/
osg::Vec3f eye;
osg::Vec3f dir;
osg::Vec3f up;
viewer.getCamera()-getViewMatrixAsLookAt(eye,dir,up);
cout The eye vector: eye.x() eye.y()
eye.z() endl;
cout The look at position: dir.x() dir.y()
dir.z() endl;
cout The up vector is: up.x() up.y() up.z()
endl;
***
-- Forwarded message --
From: ami guru dosto.wa...@gmail.com
Date: Thu, Apr 2, 2009 at 2:39 AM
Subject: Fwd: [osg-users] default coordinate system and camera - newbie
To: OpenSceneGraph Users osg-users@lists.openscenegraph.org
Hello Paul,
I have the following snippet that deals with the viewer
**'
int main()
{
//Creating the viewer
osgViewer::Viewer viewer ;
//add some event handler
//to show the statistics
viewer.addEventHandler(new osgViewer::StatsHandler);
/*
get camera related information
*/
osg::Vec3f eye;
osg::Vec3f dir;
osg::Vec3f up;
viewer.getCamera()-getViewMatrixAsLookAt(eye,dir,up);
cout The eye vector: eye.x() eye.y()
eye.z() endl;
cout The look at position: dir.x() dir.y()
dir.z() endl;
cout The up vector is: up.x() up.y() up.z()
endl;
//Creating the root node
osg::ref_ptrosg::Node root = createSceneGraph();
'**
Could you provide some hint where the bug might be , at least the way to
find it?
I want to implement a very simple scenario. A camera that moves along with
the key press event.
I already have that implemented in OpenGL program where i can roll, pitch
yaw and slide with user key press event.
I want to map that in the scene graph system.
I have the following information predefined
n = eye - look;
u = up * n;
v = n * u;
To move the camera in an ineractive way i have to have the access to there
values .
there is a function in the Camera Class called getViewMatrix() , i hope that
it is one to access these values.
Any more reference would be of great help.
-- Forwarded message --
From: Paul Martz pma...@skew-matrix.com
Date: 2009/4/2
Subject: Re: [osg-users] default coordinate system and camera - newbie
To: OpenSceneGraph Users osg-users@lists.openscenegraph.org
The CameraManipulator (like TrackballManipulator, for example) determines
the default orientation. You can change this default by setting the up
vector in the TrackballManipulator. By default, the TrackballManipulator
uses positive Z up, so if your code is getting positive Y up, either you
have a bug or you are not using the TrackballManipulator or you have changed
its default.
The default view position is also determined by the CameraManipulator. The
TrackballManipulator, for example, has a home position that you can set. By
default, it considers the scene bounding volume and tries to position the
view so that the entire scene fits within a 50 degree FOV (I think it's 50,
not sure).
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com http://www.skew-matrix.com/
+1 303 859 9466
_
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of ami guru
Sent: Wednesday, April 01, 2009 1:58 PM
To: OpenSceneGraph Users
Subject: [osg-users] default coordinate system and camera - newbie
Hello forum,
osgViewer , by default uses the world coordinate system that is oriented
with positive X to right , positive Z up, and positive Y into the screen.
Does that mean the camera' s defualt position is at the origin looking down
into the screen which is positive Y?
I have tried to extract the vectors using the function
'
osg::Vec3f eye;
osg::Vec3f dir;
osg::Vec3f up
[osg-users] default coordinate system and camera - newbie
Hello forum, osgViewer , by default uses the world coordinate system that is oriented with positive X to right , positive Z up, and positive Y into the screen. Does that mean the camera' s defualt position is at the origin looking down into the screen which is positive Y? I have tried to extract the vectors using the function ' osg::Vec3f eye; osg::Vec3f dir; osg::Vec3f up; viewer.getCamera()-getViewMatrixAsLookAt(eye,dir,up); cout The eye vector: eye.x() eye.y() eye.z() endl; cout The look at position: dir.x() dir.y() dir.z() endl; cout The up vector is: up.x() up.y() up.z() endl; The eye vector: 0 0 0 The look at position: 0 0 -1 The up vector is: 0 1 0 I was wondering if the up vector be Z axis instead Regards Sajjad ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] default coordinate system and camera - newbie
The CameraManipulator (like TrackballManipulator, for example) determines the default orientation. You can change this default by setting the up vector in the TrackballManipulator. By default, the TrackballManipulator uses positive Z up, so if your code is getting positive Y up, either you have a bug or you are not using the TrackballManipulator or you have changed its default. The default view position is also determined by the CameraManipulator. The TrackballManipulator, for example, has a home position that you can set. By default, it considers the scene bounding volume and tries to position the view so that the entire scene fits within a 50 degree FOV (I think it's 50, not sure). Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com http://www.skew-matrix.com/ +1 303 859 9466 _ From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of ami guru Sent: Wednesday, April 01, 2009 1:58 PM To: OpenSceneGraph Users Subject: [osg-users] default coordinate system and camera - newbie Hello forum, osgViewer , by default uses the world coordinate system that is oriented with positive X to right , positive Z up, and positive Y into the screen. Does that mean the camera' s defualt position is at the origin looking down into the screen which is positive Y? I have tried to extract the vectors using the function ' osg::Vec3f eye; osg::Vec3f dir; osg::Vec3f up; viewer.getCamera()-getViewMatrixAsLookAt(eye,dir,up); cout The eye vector: eye.x() eye.y() eye.z() endl; cout The look at position: dir.x() dir.y() dir.z() endl; cout The up vector is: up.x() up.y() up.z() endl; The eye vector: 0 0 0 The look at position: 0 0 -1 The up vector is: 0 1 0 I was wondering if the up vector be Z axis instead Regards Sajjad ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
