If you want the 2D objects to have depth, you'll want to use
billboarded quads.  You may want to look around to find a better
implementation but here's a tutorial - 
http://www.lighthouse3d.com/opengl/billboarding/

On May 3, 8:47 am, Paolo <[email protected]> wrote:
> Hi guys!
>
> I've a problem and I'm not able to solve at the moment.
>
> I have realized a grid with openGL on a GLSurfaceview. This grid
> rotates at 360° on all the aces using the orientation sensors.
>
> Now I'd like to put over it some markers at specified coordinates,
> such as 2D objects, as if they were attached to the grid, because they
> have to rotate together to the grid.
>
> How how I can make it?
>
> Thanks.
>
> Paolo
>
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