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I've made this random building in which I'd like to have the corners stick out like support "pillars". As I extruded on the x and y axis, I'm now in doubt about how to connect these into a a single support pillar (onnect in the middle to create a square)

This is what it looks like:

enter image description here

But this is what I want (All the way down the pillar ofc):

enter image description here

Could anyone lend me a hand to a nice solution? :)

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  • $\begingroup$ Should the exhisting geometry remain inside of newly created pillar ? Or is it acceptable to delete exhisting faces (which will become manifold otherwise) while creating new geometry ? In first case you can extrude and grab with snapping, in second probably using Bridge Edge Loops may help, again with snapping after finishing for precision. $\endgroup$ – Mr Zak Oct 21 '15 at 19:58
  • $\begingroup$ @MrZak I'm not sure what you mean? I made it working by deleting the inner faces (where the new part of the pillar needs to be connected), combine the to outer vertices (to create a triangle), the subdivide the edge that it makes, and look and the x-y position of the other vertices to make them match correctly. Then combine all 4 vertices to create a face. Hard to explain :) If you have a quick way to do this, please explain :) $\endgroup$ – Detilium Oct 21 '15 at 20:16
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Here's how I'd do this:

First delete the faces of one wall your original structure. 1st

Then select the faces of the opposite wall and extrude them till the outer edge reconstructs the shape you want. Part 2

If you find it difficult to align the verts precisely, you can snap the 3D cursor to a vertex on the outer edge by selecting this vertex and Shift + S --> Cursor to Selected. Then select the extruded faces and align them with that vertex by changing the pivot point to 3D cursor ., then scaling to 0 on the relevant axis (X in the example shown here): S --> X --> 0.

Part 2.5

Now you need to delete the useless faces in between, so select and delete them or they will be non-manifold in the final mesh: Part 3

And finally, select all your vertices and remove doubles W --> Remove Doubles, to merge all the duplicate vertices created by the extrusion.

Remove Doubles

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  • $\begingroup$ I actually managed to find another way, but this seems to be the fastest and most simple solution. Appreciate your answer. $\endgroup$ – Detilium Oct 22 '15 at 7:16
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    $\begingroup$ You could select stack of faces of one pillar and just extrude it with snapping turned on; this would allow to skip steps with scaling to 3D Cursor. You can use Ctrl+Alt+Shift+M to select and then delete non-manifold geometry (not in Face selection mode). $\endgroup$ – Mr Zak Oct 22 '15 at 14:09

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