Hi Enzo,
In order to achieve the same initial conditions in each simulation run, virtual world is always re-loaded from the associated VRML file at the beginning of simulation.
If you need to start the next simulation where the previous has ended, you shall save the values of the object properties to the VRML file.
At some suitable place (StopFcn callback etc.) put something like this:
% extract model name
model_name = bdroot(gcs);
% Here we assume that you have the VR Sink block under its original name in
% the model
% get the handle to the virtual world associated with the VR Sink
wh = vrworld(get_param([model_name '/VR Sink'], 'WorldFileName'));
% save the current status of the virtual world to the file associated
% with the VR Sink
save(wh, get(wh,'FileName'));
Of course, in order to preserve the initial status of your scene, you should backup your original VRML file and arrange copying it to your working scene, when you want to start the simulation with initial status.
Hope this helps,
Jan
