To Refine the Faceted Geometry
1. Select the area for refining using the selection marquee or using the > 
Select by Length command.
Select by Length command. | If you do not select an area, the Refine command subdivides the entire faceted surface. |
2. Click > 
Refine. The Refine dialog box opens.
Refine. The Refine dialog box opens.3. Select a Refinement Algorithm:
◦ 3X Subdivision—Replaces every existing triangle in the selected area with three triangles.
◦ 4X Subdivision—Replaces every existing triangle in the selected area with four triangles.
4. Select the Move Points check box to adjust the position of vertices to accommodate the increased number of triangles and produce a smoother surface.
5. Select the Fix Boundary check box to ensure that the boundary edges and sharp edges are not moved. This is useful when the boundary consists of corners or feature lines that you want to retain.
6. Click OK.