To Reduce Noise
1. Select the region for reducing noise. Hold down the CTRL key to select multiple regions.
2. Click > 
Reduce Noise. The Reduce Noise dialog box opens.
Reduce Noise. The Reduce Noise dialog box opens.3. Select the noise reduction method.
◦ Free-form—Reduces noise with respect to the surface curvature if the point set represents a freeform or organic shape.
◦ Mechanical—Retains sharp corners and edges if the point set represents a mechanical or prismatic shape.
4. Specify the smoothness level depending on the level of noise in the point set. You can select from Low, Medium, and High.
5. Click OK.