The procedural generation of virtual scenes (like e.g., complex cities with buildings of different sizes and heights) is widely used in the CG movies and videogames industry. Even if stereoscopy is often used in the visualization of these kind of scenes, nevertheless it is not currently used as a tool in the procedural generation, while a more comprehensive integration of stereoscopic parameters can play a relevant role in the automatic creation and placement of virtual models. In this paper, we investigate how to use stereoscopy to control the procedural generation of a scene in an open-source modeling software. In particular, we will use the stereoscopic parameters to automatically place objects inside the stereoscopic camera frustum avoiding to reach an excessive parallax on screen, and we will show how to procedurally detect and solve window violations, by means of the automatic placement of a dynamic floating window in the image.