2. Then, use the mouse to drag in the perspective area and draw a doughnut chart.
3. Then, click the deformation button in the toolbar with the left mouse button and select the Create Lattice button, as shown in the figure below.
4. Then in the perspective area, you can see that the boundary line of the torus has become the boundary of the grid, as shown in the figure below.
5. Then right-click the torus and select the vertex, as shown in the figure below.
6. Then, click the Move button with the left mouse button and select a vertex on the torus, as shown in the following figure.
7. Finally, the ring model is deformed by moving the vertices on the lattice, as shown in the following figure.