creo3 config.pro option documentation for: INTF3D_OUT_USE_STEP_SIZE 
intf3d_out_use_step_size
yes
, no
*
Specifies the use of the maximum value of step size during the export of facet geometry. Step size controls the fineness of the triangulations of surfaces. This configuration option is available as the Enable maximum step size control for facet export
3D data exchange setting in the PTC Creo Parametric Options
dialog box.
yes
- Exports the facet geometry of models using the maximum step size value for uniform triangulations with better aspect ratios.
no
- Exports the facet geometry of models without using the maximum step size value. This is the default.