# What's causing....

**URL:** <https://blenderartists.org/t/whats-causing/445036>\
**Category:** Modeling\
**Created:** [April 12, 2009, 2:04am UTC](https://blenderartists.org/t/whats-causing/445036 "2009-04-12T02:04:47Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![David\_C](https://blenderartists.org/user_avatar/blenderartists.org/david_c/32/9362_2.png) [@David\_C](https://blenderartists.org/u/David_C)\
**Post date:** [April 12, 2009, 2:04am UTC](https://blenderartists.org/t/whats-causing/445036/1 "2009-04-12T02:04:47Z")

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…additional vertices to appear? When I click on a vertex, sometimes I have to click twice and upon extruding I end up with addtional vertices that I didn’t add.

When I select two vertices and hit “F” I get the edge and then I select the remaining vertices to create the face. After extruding the region and grabbing a vertex to adjust, I notice another edge and vertices has appeared. What gives?

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**Author:** ![Myke](https://blenderartists.org/user_avatar/blenderartists.org/myke/32/1389_2.png) [@Myke](https://blenderartists.org/u/Myke)\
**Post date:** [April 12, 2009, 1:00pm UTC](https://blenderartists.org/t/whats-causing/445036/2 "2009-04-12T13:00:14Z")

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Ctrl + Left mouse Click creates a new vertex. Maybe that’s it?

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**Author:** ![Hobo\_Joe](https://blenderartists.org/user_avatar/blenderartists.org/hobo_joe/32/5497_2.png) [@Hobo\_Joe](https://blenderartists.org/u/Hobo_Joe)\
**Post date:** [April 12, 2009, 1:12pm UTC](https://blenderartists.org/t/whats-causing/445036/3 "2009-04-12T13:12:41Z")

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Maybe you started an extrusion and canceled it. Right clicking after starting an extrusion doesn’t REALLY cancel it. It just puts the new extruded vertices in the same location as the old ones.

Anyhow, removing doubles will fix it.