Provides settings for the Repair 
portion of Process Geometry Data 
.
These settings are not saved with the preferences; rather, they are automatically
set based on the results of the checks. You can bypass a repair by clearing the check
box for the repair. If all the checks are successful, then the Repair step of the Process Geometry Data command is not available.
Orient Normals
Forces the normals to be consistently oriented inwards.
Slivers
Removes the faces with edges completely within the Points tolerance of each other. The Points tolerance is set on the Options Dialog Box.
Gaps
Closes the gaps between adjacent face edges by adjusting the control points along one of the edges to match the control points along the other edge.
Triangles
Fixes the triangular faces formed with degenerate edges defined by coincident control points.
Internal Knuckles
Fixes the faces with internal knuckles (C1 discontinuities) by splitting at the knuckle.
Convexities
Splits the edges of the selected objects at changes in convexity points.
Execute
Runs the repair process. The software displays 
for the repairs that fail and 
for the repairs that succeed.