You can fill holes in mesh models using the Fill Hole option and selecting the open boundaries.
If the hole to be filled covers an area of different curvature, split the hole into smaller regions, and fill them separately. This allows more complicated holes to be fixed without the need for full manual triangle-editing. After selecting a hole to fill, you can pick two points on the boundary to split the hole into two regions. If the wrong side is highlighted by default, click to select the region that you want to fill.
Using the model below as an example, fill the hole in two parts, filling the flat area with a planar cap, and the curved area with a curvature cap:
Use the following key and box selection techniques to select holes to be filled in a selected mesh:
Shift and box selection to add the selection to the set of selected holes.
Ctrl and box selection to invert the selection status of holes intersected by the box.
Box selection without Ctrl or Shift adds holes intersected by the box to the set of selection holes. All holes that are not intersected by the box are removed from the selection.
The examples below show how important it is to select the correct Mode option. The example shows that in this case, as the hole is on a curved area, you should use the Curvature cap option.
Hole filled with a Curvature capThe average length between nodes surrounding the hole is displayed in the Distance between cap nodes. This value is used to determine the density of the new nodes. Change the value as required.