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Blender: Remove Doubles – How to Remove Double Vertices

Aug 12, 2019 by Tanner Hartmann

Duplicate or double vertices in Blender can pose some real problems in modeling. Learn more about vertices in general with this guide, including how to remove doubles in Blender.

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Blender: Remove Doubles Hidden in Plain Sight

Image of: Hidden in Plain Sight
Some cool concept art made in Blender. (Source: BlenderNation)

Blender is a popular modeling software due to its vast feature set and attractive price tag – that is, it’s free. But many beginners don’t expect to encounter the problem of double vertices as they’re learning the ropes, especially since it’s hiding in plain sight. Follow us on this quick guide as we demystify the error of double vertices and teach you how to fix it.

In the meantime, if you’re new to this whole Blender business, check out some of our Blender resources.

Blender: Remove Doubles Double Trouble

Two vertices can appear as one.
Two vertices can appear as one. Source: Tanner Hartmann / All3DP

The problem is simple: You’ve got overlapping vertices which may visually appear to be singular.

The easiest way to discover the issue of duplicate vertices is through the Boolean tool. That said, sometimes it can backfire and create vertices very close together or even in the same spot! This can cause a variety of issues, such as undesired deformations or unexpected difficulties with tools like the knife tool or modifiers that affect the mesh.

It may be hard to notice this issue, but it usually becomes evident when another tool doesn’t work properly. For example, trying to subdivide an edge may not work if either end has multiple vertices.

Checking for Double Vertices

One way to check is to look at the top of the window where it shows the number of vertices, edges, and faces in the scene. In this case, we’re looking at vertices (labeled as “Verts”), and in the picture above, you can see how two vertices can appear as one.

First, turn off the “Limit Selection to Visible” function, which is located on the lower bar of the viewport. You can then hold ‘B’ and right-click in order to drag and draw a selection box around the vertex you suspect is duplicated. This allows you to see through the mesh and select vertices on the back-faces.

Blender: Remove Doubles How to Fix It

Navigating menus in the process of removing double verticees.
Navigating menus in the process of removing double verticees. Source: Tanner Hartmann / All3DP

The solution is fairly simple: Using the “Remove Doubles” tool, you can easily collapse the duplicate vertices into singles. This is done in three steps:

  1. Select the duplicate vertices.
  2. Find and click “Remove Doubles” under the tool tab to the left of the viewport or by selecting Mesh > Vertices > Remove Doubles from the bottom menu.
  3. Adjust the “Merge Distance” value. This determines how close vertices need to be in order to be collapsed into one. The higher the value, the farther apart they can be. If you increase too much, the results can be undesirable and surprising, so it’s best to keep this value lower to be safe.

The doubles are now removed, and you can go about your day!

Note: This is also an important final step when creating an STL for 3D printing.

Feature image source: CGCookie

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License: The text of "Blender: Remove Doubles – How to Remove Double Vertices" by All3DP is licensed under a Creative Commons Attribution 4.0 International License.

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