You can intuitively see, compare, and analyse the differences between the before-the-simulation 3D image and the after-the-simulated-procedure 3D image. 

1. When you are finished with the simulation, select Save to save it.
2. Open the "before" image by selecting on the top right corner.
   The screen is split in two, where the before 3D image is on the left and the after 3D image is on the right-hand side.
3. Minimize the simulator floating menu by selecting .
   This will help you have a clearer presentation of both images.
4. See and analyze the images from different perspectives. For that, you can:
   1. Select one of the predefined images at the bottom left corner.
   2. Rotate the model sideways manually using the mouse if you are working with a computer or with your fingers if you are using an iPad.
   3. Zoom in or out both images using the mouse wheel if you are working with a computer or pinching with your fingers if you are using an iPad.
5. See and analyze the images as a transition.
   For that, select at the bottom right. A vertical slider appears. You can move it from the top (Before) to the bottom (After) and slightly see the changes.