OpenGL 2d drawing facing the user

I have an OpenGL scene in which the user can rotate the camera. I have some two dimensional shapes that I would like to always face the user. I do have the forward facing vector, and I do have the screen point at which the component should be drawn. I'm not sure the best way to approach this problem - should I be rotating the shape to the forward vector (which I'm not entirely sure how to do correctly)? Or is there another way I can just draw in two dimensions and ignore the rotation of t开发者_JAVA技巧he camera (maybe by using an orthographic projection)? Any sample code for helping with this would be appreciated.

PS - I'm doing this in Java, but the language is irrelevant here (it is just OpenGL specific).

I already answered it in Inverting rotation in 3D, to make an object always face the camera?

My first though is to use the "gluLookAt" matrix.

http://www.opengl.org/resources/faq/technical/viewing.htm

I would say, that you keep the position of the 2d objects, and then take the "eye" or camera position and set that as the target value for the 2d objects. It should keep them facing the camera.