Querying the Surface Validity
 Query surface validity  tool checks for any problems with the surface, such as 
 holes or self-intersecting triangles.
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On the Query ribbon tab navigate to the Surface group and select
 Surface Validity. - 
                                                
Select the surface(s) to be checked (multiple surfaces are allowable).
                                                    
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Selecting Check for inconsistent surface will check that all triangles are pointing in the same direction (if not, this can lead to problems with calculating volumes and creating fusions).
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Selecting Check for surface closure will check the boundary edges. This is only applicable to closed solid surfaces. Clear this for all other surfaces.
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Selecting Check for self-intersections will check for self intersecting triangles on the surface, as shown below.
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Selecting Check for trifurcations will check for and find any edges with more than two facets sharing the same edge on a surface.
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Select Mark location of failures to create objects in the cad container that highlight the locations of the errors.
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Click OK or Apply.
A written summary of the results is displayed in the Report Window.
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Drag and drop any object(s) created in the cad container onto the surface view window to display any errors found.
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To repair any errors found, zoom into the error and display the surface in wireframe
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Using
 Select points mode, select 
	 a corner point on the triangle and press Delete. - 
                                                
To fill the hole created, on the Edit ribbon tab navigate to the Fix group and select
 Fill 
	 Holes. - 
                                                
Repeat this procedure for all errors found.