'Toolpath - 3D Dynamic' may be customized to give the option to create a faceted solid of 'Gouges' and 'Excess' IPW (In-Process Workpiece) material:
Customer Defaults - Manufacturing - Simulation and Verification - General tab - Enable Faceted Solid for Gouges and Excess.
With NX 11 onwards, the default IPW is 'Exact' rather than 'Faceted', which results in a message 'No excess material found'.Solution
set environment variable to enable faceted IPW
UGII_CAM_IPW_USE_EXACT = 0