The Coarsen Surface option reduces the number of triangles on a faceted surface. This option is useful for reducing the amount of data. After the surface is selected, the application prompts to select curves and then points in order to maintain the sharp features of the surface. Otherwise, the original surface integrity may not be maintained. The curves and points that have been extracted from the selected surface by one of the following methods should be selected:

Create curve > Extract from surface

Create curve > Build topology

Repair Geometry > Create topology

Create point > Extract from curve

Tolerance

Distance within which to merge nodes of the surface. Default is 1/10th of the Min edge length. The Min edge value is the length of the shortest edge on the selected surface. The tolerance value is a maximum deviation from the original surface triangulation.