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I'd like to create a single triangle by mirroring one vertex exactly on the mirror plane and another vertex across the mirroring plane to create a single face. I've shown an example image. In this example, I've already applied the mirror modifier but it won't create a face across the mirror boundary.

Mirroring Example

I'm really hoping something like this is possible? I guess I could just leave this one triangle until the very end, then apply the mirror modifier and fill it in, but it would be nice if I could leave the mirror modifier in place and have it correctly construct this face. Is there a trick to doing this?

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The mirror modifier in your illustration is working exactly as it is designed to do. In this case, it is mirroring an edge. To complete a face, you need to add one more vertex, located at the intersection of a line perpendicular to the y axis, and the y axis, which passes through the vertex furthest from the y axis, and create the face. The easiest way to create this vertex in the illustrated figure is to extrude from the vertex at the far right to the y axis, constraining the extrusion to the x direction. If you do this, the mirror modifier will work the way you wish.

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    $\begingroup$ But then it will create two triangles and I just want one. $\endgroup$ – aardvarkk Jun 20 '14 at 0:14
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    $\begingroup$ There would also be an edge that ran along the Y axis, which I also don't want. I'm basically trying to mirror polygons across the boundary without having a seam along the mirrored axis, if that makes sense. $\endgroup$ – aardvarkk Jun 20 '14 at 1:24
  • $\begingroup$ Then I think you're trying to use the mirror modifier to do something it can't do, in this case, creating something (an edge) from nothing. $\endgroup$ – brasshat Jun 20 '14 at 2:24
  • $\begingroup$ So is there some better way to do what I'm wanting to do? I suppose it would just have to involve post-processing, eh? Apply the mirror modifier and then fill in any holes that it didn't connect? $\endgroup$ – aardvarkk Jun 20 '14 at 3:25
  • $\begingroup$ I don't know enough about your project or workflow design to know exactly what you are trying to do. $\endgroup$ – brasshat Jun 20 '14 at 4:47

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