Merge by distance
Weld nearby vertices within a chosen tolerance. The example joins matching seam vertices without changing the outside boundary.
Before you start
Enter Edit Mode and select the region to clean. Estimate the smallest gap that must remain open before choosing a merge distance.
Use the operation
Weld nearby duplicate vertices without collapsing all selected vertices into one point.
- Press M and choose By Distance.
- Enter a small distance and inspect the live preview and removed-vertex count. The initial value is 0.0001.
- Increase the distance only enough to join the intended duplicates. Choose Merge or press Enter to commit; Cancel restores the original geometry.
Controls and choices
| Controls | What changes |
|---|---|
| Distance | A nonnegative proximity threshold. A large value can erase narrow gaps or small details; work from the smallest useful value. |
| Selection scope | Limit the selection to the affected seam or region so unrelated nearby features are not included. |
| Preview count | No removed vertices means the current selection has no qualifying merge at that distance. It does not prove the whole model is clean. |
See what changes
Before
A split seam
After
A welded seam
Check the result
Inspect the seam for remaining duplicates and verify that narrow openings and material boundaries still look right. Undo if the cleanup changes a feature you wanted to keep.
Practice in Show3D
Open the editor and follow the steps with your own scene.