Troubleshoot changing polygonal topology may affect shader assignments
 
 
 

Changing the topology (number of faces) on a polygonal object by modifying attribute values on history nodes connected to the object can adversely affect shader assignments. This happens if the shader assignment is done before the operation that modifies the topology, or at the component (face) level (for instance, shaders assigned to portions of the object instead of the entire object).

To workaround, redo the shader assignment after the topological modifications have been completed.