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I am very new to blender and I have a problem where I can't dissolve these two faces and I don't know why. Can someone help me ? enter image description here

Link to the blender file if anyone need it : https://mega.nz/#!BxBkVA5b!Xz0vgBDgfhW32xzLA_DX5Xp-r9dFMtxl2wbwyY0Km5U

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    $\begingroup$ please, at least next time, could you use blend-exchange.giantcowfilms.com service to upload .blend files, since it's the preferred way here? Thanks $\endgroup$ – m.ardito Feb 28 '17 at 11:05
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    $\begingroup$ I think you can't dissolve. Because dissolve will lower the geometry, and if you do it here, the wall will overlap the windows $\endgroup$ – lemon Feb 28 '17 at 11:29
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A face is a polygon. A polygon is an array of vertices.

The way it is interpreted is:

  • Make a first triangular part with vertices 1, 2, 3
  • Then make another one with 2, 3, 4
  • Then 3, 4, 5
  • Etc.

This does not allow to have holes in it except if there is only 1 hole, or in some special cases for example if the holes are triangular themselves (at least, I think, this is surely a complex topology problem...).

So, my though is that you can dissolve only if there is a path of triangles "calculable" all along this polygon. And I don't think this is the case here due to the 3 square holes. Or if you dissolve, the polygon will cover/overlap the windows.

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  • $\begingroup$ Alright, so right now it's the best I can achieve if I understood correctly ? $\endgroup$ – A Real Snake Feb 28 '17 at 11:53
  • $\begingroup$ I think the question is "why do you need to do that ?". And yes, you cannot lower the amount of faces here. But after a look at your file, some vertices can be removed. $\endgroup$ – lemon Feb 28 '17 at 11:54
  • $\begingroup$ Mainly for UVs, I like it when things are 100% clean, but I guess I will have to do with it. Thansk for the help ! $\endgroup$ – A Real Snake Feb 28 '17 at 12:05
  • $\begingroup$ @ARealSnake it's most likely that you won't get everything clean when having Ngon like that, UVs don't like such distortion. Go with quads or tris if low-poly and unwrap. $\endgroup$ – Mr Zak Feb 28 '17 at 12:35
  • $\begingroup$ Thanks for the info again, it will greatly help me in the future ! $\endgroup$ – A Real Snake Feb 28 '17 at 14:44

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