Go to "border selection" (Default key 3), select one edge of the hole, all other should be selected automatically) and then click on "cap" in the Edit Rollout. This will fill the hole with a single n-gon. You can then go to vertex mode (default: 1) select the vertex and use connect to create 4-sided Polygons.
Another alternative would be to select the borders vie "border selection", then select "scale" and while Holding shift, scalling the borders together until all new vertex overlap in the middle. You then Switch to Vertex mode while keeping the selection (STRG +1) and hit the "weld" button.
Go to "border selection" (Default key 3), select one edge of the hole, all other should be selected automatically) and then click on "cap" in the Edit Rollout. This will fill the hole with a single n-gon. You can then go to vertex mode (default: 1) select the vertex and use connect to create 4-sided Polygons.
Another alternative would be to select the borders vie "border selection", then select "scale" and while Holding shift, scalling the borders together until all new vertex overlap in the middle. You then Switch to Vertex mode while keeping the selection (STRG +1) and hit the "weld" button.
@Millenia: This method can also be used, but I experienced some issues when creating high poly (sub-D) models from it. I normally prefer a "centerpoint-cap", even if this creates one additional vert and some more polys.
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This will fill the hole with a single n-gon. You can then go to vertex mode (default: 1) select the vertex and use connect to create 4-sided Polygons.
Another alternative would be to select the borders vie "border selection", then select "scale" and while Holding shift, scalling the borders together until all new vertex overlap in the middle. You then Switch to Vertex mode while keeping the selection (STRG +1) and hit the "weld" button.
1) use the Border selection mode to select the open edge
2) deselect two opposing edges
3) hit the "Bridge" tool