As is known, the term virtual studio is usually referred to the integration of synthetic and real environments: if an action occurs in the real world, the same must be reproduced in the artificial scene. The integration may be realized using one of the available systems which are generally characterized by high and expensive technology. Our work proposes an approach with two important advantages: low cost and possibility of building collaborative work. The system consists in a location named SM (generator of Synthetic worlds Meshing between real and virtual worlds) and in a differently located site indicated as V. The system SM is a powerful graphics oriented machine, which is able both to make highly realistic real time rendering of a complex virtual world, and to mesh the virtual scene with the video signal received from the V system. We suppose the V system characterized by a uniform background and a subject captured by a web cam whose video frames are sent to the SM system. In order to obtain the right information about the position of each video camera in the real world coordinate system and the zoom parameters, we propose an easy approach based on detecting the shape variations of a flag, with known aspect and dimension, placed in a defined position in the uniform background. This means that in a particular frame the scene modifications are codified in a few parameters related to the flag variations, so the integration between real and virtual becomes easy. The mesh results are sent to V, while just the selected meshed image is available for a generic user connected to the net service. The system may be applied in different contexts, for example video conferences and multiplayer virtual sets.