The visual forms the world of the animation. The model is displayed in the main window of the Simulator. This is a graphical editor where the model can be manipulated.
A visual model can be entered either by loading it from a file or by drawing it from scratch. It is also possible to first load a visual model and then edit it in the Simulator editor window.
To load a visual model from a file select the option Open Model from the File menu. A file chooser dialog will open where you can specify the file containing the visual model. The loaded model will then be displayed in the editor.
New visual models can be created by drawing them in the editor. Typically when the simulator is started the first time it is showing a new empty model. However if there is already a model open you can start a new one by selecting the menu option New model from the File menu. If changes have been made to the currently open model a dialog window will appear asking whether you want to save the changed model first. You can choose to save the changes, discard the changed model or cancel. If you choose to save the changes you will have to specify the file where to save the changed model. Finally unless you chose to cancel a new model will be created and the editor window will thus become empty. You can then start to draw the model.
Once you have finished modifying a visual model you can make the changes permanent by saving the current state of the model to a file. Then it may subsequently be loaded in the same state. To save the current visual model select the menu option Save Model from the File menu. A dialog window will be opened where you can specify the file to save the model to.