The role of a stereographer in modern 3D movies can be summarized as:
Being part of the film (movie) crew, ideally at the script and screen play revision phase for the best 3D experience. If not possible, then at the very least at the Camera and Scene blocking stage
Creating a depth script for “3D mood” treatment of the movie. This is a creative process with the Director, the technical conclusions of which are shared with the DoP for final recommendations.