Camera to the world

[Daoudou]

Hello.

I have another problem. I use setViewMatrix in my camera to have a view in my world but how can i do to enter into the world ?
if i what to in my skydome the camera stay outside the skydome.

If i don't mistake placing the camera at a certain point P applies a translation of -P to the whole world.
Or i have to change the projection like it's like the lens of a camera.

camera->setViewport(new osg::Viewport(iViewport[0], iViewport[1], iViewport[2], iViewport[3]));
camera->setProjectionMatrix(projectionMatrix);
camera->setViewMatrix(modelViewMatrix);

Thanks in advance.

SOUFFOU

[trajcenikolovnick]

try camera->setViewMatrixAsLookAt( eye, center, up )

…

On Mon, Mar 6, 2023 at 5:01 PM Daoudou ***@***.***> wrote: Hello. I have another problem. I use setViewMatrix in my camera to have a view in my world but how can i do to enter in the world ? if i what to in my skydome the camera stay outside the skydome. If i don't mistake placing the camera at a certain point P applies a translation of -P to the whole world. camera->setViewport(new osg::Viewport(iViewport[0], iViewport[1], iViewport[2], iViewport[3])); camera->setProjectionMatrix(projectionMatrix); camera->setViewMatrix(modelViewMatrix); [image: Capture] <https://user-images.githubusercontent.com/98310378/223147168-aae21a90-328b-4edd-8c55-6d93d03d5f8d.PNG> Thanks in advance. SOUFFOU — Reply to this email directly, view it on GitHub <#1208>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC7ND7EU76I2GX3YL5U7XQLW2X34RANCNFSM6AAAAAAVRHRNUI> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

-- trajce nikolov nick

[Daoudou]

Okay i will try it thanks

I will also see if I can associate its with the modelViewMatrix that I get from my OpenGL project to have the same view dynamically.

[Daoudou]

Problem solved 👍

I get the modelViewMatrix and the projectionMatrix of opengl in OpenSceneGraph

        osg::Matrixd modelViewMatrix(modelMatrix[0], modelMatrix[1], modelMatrix[2], modelMatrix[3],
        modelMatrix[4], modelMatrix[5], modelMatrix[6], modelMatrix[7],
        modelMatrix[8], modelMatrix[9], modelMatrix[10], modelMatrix[11],
        modelMatrix[12], modelMatrix[13], modelMatrix[14], modelMatrix[15]
     );

    osg::Matrixd projectionMatrix(projetMatrix[0], projetMatrix[1], projetMatrix[2], projetMatrix[3],
        projetMatrix[4], projetMatrix[5], projetMatrix[6], projetMatrix[7],
        projetMatrix[8], projetMatrix[9], projetMatrix[10], projetMatrix[11],
        projetMatrix[12], projetMatrix[13], projetMatrix[14], projetMatrix[15]
    );

I create a first camera and i set it in the first camera

    Camera->setViewMatrix(modelViewMatrix);
    Camera->setProjectionMatrix(projectionMatrix);
    Camera->setViewport(new osg::Viewport(iViewport[0], iViewport[1], iViewport[2], iViewport[3]));

Get the LookAt matrix

    Camera->getViewMatrixAsLookAt(eye, center, up);

Get the camera of my viewer and calulate the position of the camera with the LookAt of the first camera

    eye1 = eye;
    center1 = center;
    up1 = up;

    eye1.x() = (((eye.x() + (camera_pos[0] / 2.)))*1.5) / ratioZoom;
    center1.x() = (((center.x() + ((-camera_pos[0]) / 2)))*1.5) * ratioZoom;
    
    eye1.y() = (((eye.y() + (camera_pos[1]/2.)))*1.5) / ratioZoom;
    center1.y() = (((center.y() + ((-camera_pos[1]) / 2)))*1.5) * ratioZoom;

    eye1.z() = (((eye.z() + (camera_pos[2] / 2)))*1.5) / ratioZoom;
    center1.z() = (((center.z() + ((-camera_pos[2])/2)))*1.5) * ratioZoom;

(Yes, i take my head a lot )
i set this here if someone want to do the same thing

Thanks.