Coincident Vertices

Coincident vertices are separate, individual vertices in a single 3D object that occupy the same location in space. Essentially, the vertices are overlapping. This sort of issue can come up when combining multiple elements or along the edges of open polygons where the vertices have been snapped to one another. 

Coincident vertices often cause smoothing problems when the model is rendered, and can cause errors when the model is exported to other applications. To avoid these problems, coincident vertices must be welded or attached together to form a single vertex. Sometimes, when you have coincident vertices, you will have coincident faces as well and it’s sometimes easier to identify those elements and remove them. 

CheckMate Pro LogoPSLogo For CheckMate Pro (2.1.2), PixelSquid (2.2.2), and StemCell (1.4) certification, your model may not have any coincident vertices.

1. Click on the plus symbol in the upper left corner of the viewport, from there select Xview > Overlapping Vertices.

2. Go to the menu at the top and click Customize > Units Setup, then click the box for Generic Units.

3. Green text telling you how many overlapping vertices your object contains will appear in the bottom middle area of the viewport. Go to the Modify Panel and select the Edit Poly Modifier. Then change the selection type to Vertices.

4. Go back to the green text at the bottom middle of the viewport and right click it. Then hit Select results.

5. Set the Tolerance in the Selection window to 0.0001.

6. Go back to the Modifier Panel scroll down and click the settings box next to the Weld button. Set the welding threshold to 0.001 and double click the circle with the green check in it.

7. Your model is now free of overlapping vertices.

In order to find “Coincident” or Overlapping vertices in Maya, download the Maya PRO Tool script on our Older CheckMate Tools page.

2. Once you have downloaded the script, go to the “Tests” label and run the “Overlapping Vertices” test.

3. If there are any overlapping vertices, they will now be selected. They will also appear listed in the script window in the bottom right corner.

4. Now that the overlapping vertices are selected go to Edit Mesh > Merge.

5. If your object’s topology is especially dense you will have to lower the Distance Threshold to avoid merging vertices that are not overlapping.

Once you have merged the selected overlapping vertices, run the script again to make sure all the vertices have been merged. If the have all been successfully merged the script window in the lower right corner will say “False” when the “Overlapping Vertices” test is performed, this means your model in now free of overlapping vertices

1. Select your model in the viewport.

2. Be sure to have “Points” selected, then go up to the main menu then select Mesh > Command > Optimize. All of the Coincident Vertices will then be selected. To know how many are selected you will need to be sure to have checked “Selected Points” in Options > Configure > HUD (located in “Viewport Perspective”)

3. If you would like to simply control the tolerance, click on the settings cog located right next to the Optimize button.

Once a Scene file is created Coincident Vertices are automatically removed from your modeling file.

  1. Select the object and make sure you are in edit mode with vertices selected.

Edit Mode in Blender

2. Press “A” to select all vertices.

All Vertices Selected

3. Go over to the toolbars panel and press “Remove Doubles”

Remove Doubles

4. The number removed vertices will be displayed at the top next to the Blender logo.

Vertices that have been removed.