[osg-users] [forum] How to make isometric view

[Robert Osfield]

Hi Jean-Yves,

On 8 March 2018 at 16:33, Jean-Yves Garneau
<jean-yves.garneau at criq.qc.ca> wrote:
> I'm trying to figure out how to render my scene as an isometric view.
> I have not found a complete example.
> I have some boxes in my scene, so I compute the bounding box of the root node an using "getCamera()->setViewMatrixAsLookAt(eye, center, up) but it is not really orthogonal.
> Can someone have example to compute the eye position for isometric view?


For a isometric view you'll need to set the view and projection
matrices.  I don't have an OSG example of doing an isometric view but
it shouldn't be hard.  The Camera set up for a map view will be
something like:

    osg::BoundingSphere bs = scenegraph->getBound();
    double r = bs.radius();
    view->getCamera()->setProjectionMatrixAsOrtho(-r, r, -r, r, -r, r);
    view->getCamera()->setViewMatrixAsLookAt(bs.center()+osg::Vec3d(0.0,
0.0, r), bs.center(), osg::Vec3d(0.0, 1.0, 1.0));

Cheers,
Robert.