Camera Opengl to OSG or with MatrixTransfrom

[Daoudou Souffou]

Hello all

I have some questions.

I want to transmit the camera of my opengl scene to my OSG scene, to do this I retrieve the view of my camera as well as the point it is looking at with the following code:

{

GLdouble camera_pos[3];

        double rationZoom    = m_pModel->GetView()->m_graphEnv.GetZoomRatio();
        int* iViewport       = m_pModel->GetView()->m_graphEnv.GetViewport();
        double* projetMatrix = m_pModel->GetView()->m_graphEnv.GetProjMatrix();
        double* modelMatrix  = m_pModel->GetView()->m_graphEnv.GetModelMatrix();

        double screenCenterX = m_pModel->GetView()->m_graphEnv.GetScreenCenterX();
        double screenCenterY = m_pModel->GetView()->m_graphEnv.GetScreenCenterY();
       
        double rotateX = m_pModel->GetView()->m_graphEnv.GetRotationCenterX();
        double rotateY = m_pModel->GetView()->m_graphEnv.GetRotationCenterY();
        double rotateZ = m_pModel->GetView()->m_graphEnv.GetRotationCenterZ();

  // I retrieve the camera and the center of the screen (for the point it is looking)
        gluUnProject((iViewport[2] - iViewport[0]) / 2, (iViewport[3] - iViewport[1]) / 2,
            0.0, modelMatrix, projetMatrix, iViewport, &camera_pos[0], &camera_pos[1], &camera_pos[2]);
      

        // rotCenter it's the center point looking
        osg::Vec3f rotCenter = osg::Vec3f(screenCenterX,
                                          screenCenterY,
                                          rationZoom * (-1.0));

        double X = (camera_pos[0] / 2) / rationZoom;
        double Y = (camera_pos[1] / 2) / rationZoom;
        double Z = (camera_pos[2] / 2) / rationZoom;

       osg::Vec3 updateCameraPosition(X, Y,Z);

        osg::Vec3f eye(updateCameraPosition);

        osg::Vec3f up(0, 0, 1);
        osg::Vec3f centre = osg::Vec3f(rotCenter.x(), rotCenter.y(), rotCenter.z());

        nodeCamera->setViewMatrixAsLookAt(eye, centre, up);

}

but i don't know why, i have wrong values with osg eye Y axis. Does anyone have any ideas ?? 

If I'm not mistaken the OpenGL coordinate system is : Y up, X right, Z forward but I don't have this configuration on my OSG scene. Maybe this is the problem ?

Or I have to use Matrix Transform and rotate the matrix to have the same coordinate system of my OpenGL scène ??  So can I set matrixtransform with my camera and set it to my viewer ??

Thanks in advance 

Souffou

[Robert Osfield]

Could you post your question on the new github forum as this is new official place for support.

https://github.com/openscenegraph/OpenSceneGraph/discussions

[Daoudou Souffou]

Hello 

Okay thanks 

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