This mode is available only in FeatureCAM 3D. RapidCut simulation does not apply to turned parts. In this mode the tool is not animated, but rather the results of the simulation are directly displayed. For most parts, the simulation takes only a few seconds to complete.
To start this simulation mode, click the 3D RapidCut 
button.
If you have set a break point, the result of the simulation is performed up to the break point. If you have not set a break point, then the whole NC program is simulated. The slider of the simulation toolbar also affects the display. If the slider is all the way to the right, only the final simulation result is displayed. Position the slider bar further to the left to see intermediate results.
When you have run a RapidCut simulation you can then run a part compare to see how the toolpaths you generated compare to the final shape.