When repairing imported surface models it is sometimes necessary to patch holes in the surfaces. There are many tools and techniques available and each have their own trade-offs. If a surface has a hole in it that does not cross into another surface region using the Delete Hole feature will provide the most seamless patch.
In the example shown in the image below it can be seen that the surface has a hole which does not run into another surface region. This can be easily patched by selecting the edge of the hole and tapping ‘Delete’ on the keyboard. A dialog box will be presented with the choice of ‘Delete Hole’ or ‘Delete Feature’. Selecting the Delete Hole option will delete any hole created with a sketch, the Simple Hole, or the Hole Wizard features and create a seamless patch.
An alternate method would be to create a Surface Fill feature over the hole. This always creates a seam around the Surface Fill feature which may not be desirable.
The image above shows the results of a Delete Hole feature and a Fill Surface feature. Notice that the seam on the left is from the Fill Surface feature while there is no seam from the hole which was to the right.