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I'm working on a project and need to build a house. The basics of the 1st floor is done, but I have to add a foundation to it due to the landscape around the house is uneven, like on a real house.

To make the foundation, I select the bottom vertices of my outer wall on the house, and extrude them downwards, to later separate the extruded part into what will be the foundation. However, when I extrude, the mesh goes berserk, throwing and stretching faces to infinity and beyond.

enter image description here

Anyone know why this is happening?

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  • $\begingroup$ Did you use for this any add-on, like Archimesh or maybe boolean for doors/windows? $\endgroup$
    – cgslav
    Commented Aug 4, 2017 at 15:17
  • $\begingroup$ Only solidify.. $\endgroup$
    – FreemoX
    Commented Aug 4, 2017 at 15:18
  • $\begingroup$ Is this happening with Solidify turned off? $\endgroup$
    – cgslav
    Commented Aug 4, 2017 at 15:21
  • $\begingroup$ No, but when I turn it back on, the "artifacts" appear again. $\endgroup$
    – FreemoX
    Commented Aug 4, 2017 at 15:25
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    $\begingroup$ I don't see how this can be a topology issue. I made sure there are no duplicate faces. I have a few edges as guidelines for the doors and windows, and what you see on the GIF is a view of the entire outer wall and inner wall. I could probably work around this by applying/removing the solidifier, but I don't want to change that until it's ready for export to my game file. $\endgroup$
    – FreemoX
    Commented Aug 4, 2017 at 15:34

1 Answer 1

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Ah, I found the issue.

enter image description here

I have two entrances to the house, a front door and a back door. To prepare for the extrude for the foundation, I added a edge below the doors, so it would make a face when extruded.

It seems that extruding non-faces is causing issues in Blender, and that's what was causing my issues.

Removing these edges before extruding works. So I can simply fill the faces after extruding.

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