There must be Stock defined and the Stock Visibility turned ON.

1.Make sure Stock is defined for your Machining Job.

Stock is defined for your Machining Job

2.From the Program tab, select Define Stock Material and select a material from the Stock Material dialog box.

3.Select the Turn Operation from the Machining Browser.

4.Turn Stock Visibility ON.

Turn Stock Visibility ON

5.Turn Material Texture Visibility ON.

Turn Material Texture Visibility ON

6.Select the Simulate tab.

7.Check the box next to Simulate by Moves.

8.Adjust the Slider to the far left (i.e., 1 move at a time).

9.Pick the Step button to see one tool motion.

10.Continue to pick the Step button to "step-through" all tool motions.
An example of Cut Material Simulation with Material Texture is shown below.
The material is set to Aluminum-6061 under Choose Stock Material of the Stock Material dialog box.