Points > Curvature Sample (applicable to unordered data only) eliminates points in flat regions but preserves points in high-curvature regions to maintain detail.
This operation modifies the selected object permanently. The operation affects selected region(s) of the object, or the whole object if no region is selected.
Percentage field - specifies the percentage of original points that will remain in the object. 100 maintains all points, while values approaching 0 maintain fewer points.
OK button - eliminates the points and closes the dialog.
Cancel button - closes the dialog without eliminating points.