Spline Removal

If healing fails to convert spline surfaces to analytic ones fails, the simplification tolerance can be modified and healing re-run: 

healer default simplifytol .1

healer autoheal body 1

Spline surfaces can also be forced into an analytic form (use this command with caution): 

Healer Force {Plane|Cylinder|Cone|Sphere|Torus} Surface <id_list> [Keep]

The Keep option will retain the original body and generate a new body containing analytic surfaces. Note: Spline curves can be found using entity filters: 

Execute Filter Curve Geometry_type Spline