another point : you have some doubles. If you just "remove doubles", the situation is clarified

I removed the doubles and that helped. But somehow the side walls and back wall are still connected with the ceiling and I think the ceiling and those walls should be two uv islands. I updated the bled file. How make the walls and ceiling two unconnected islands ?

If you select one of these faces and Ctrl+L using the delimit by seam option, you will see what is connected and so what needs an additional seam.

Concretely, the under faces of the balcony are connected to the surrounding walls via faces that go to the back of the house

I must have sand in my eyes but I cannot find this "delimit by seam option". could you show me ?

I've no tool that allows me to upload the screen capture right now, but in the tools panel (T) of the 3DView, you have an option box at the bottom of this panel that contains options for almost any Blender's command. So included Ctrl+L (select linked) command. So select one bottom face of the balcony, Ctrl+L, then use "Delimit by seam" in this panel.

thanks. I now see the problem. should I make loop cuts in the balcony ?

Hello Old Man. BSE proposed me to continue in chat

In my opinion you should add seams to the balcony. But I don't know the tutorial you are following and can't guess what its author wants to do

And about "loop cuts", I think cuts are already there, you just need to add seams

If still needed, I have finally found a image in the documentation that indicates where is this operator option panel : docs.blender.org/api/blender_python_api_2_70_0/_images/…

could you perhaps set the seams where you think they should be ?

ok, let me a minute to do that

I have found that Delimit by Seam. Bu what does it exactly do ?

and what is the difference between CTRL + L and just L ?

What it does : first make a primary selection, then use Ctrl+L to select all that is linked. Then this delimit by seams option will stop to extend the selection if a seam if encountered. So from a face you can select all that correspond to the same UV isle

ok

now I understND

It seems L is similar, but I did not knew it. The 'select' menu of the 3D View indicates 'Ctrl+L' as shortcut

well... I have added a seam here... but when unwrapping, I still see some regions that overlap

DID I mess up things ?

No no... I did not wanted to say that... just it is difficult to me to understand all the needed details of a model that I don't know

aha

I think that the balcony should be a separate island

Somebody is at my door ... I am back as soon as I can

Yes... I am trying to do so here. There is also a strange offset under the floor (or at the ceiling of the first floor of the house).

It is very hard to describe just with text and long to share with images or GIFs... anyway to talk directly you know ?

Tell me. In meantime, I try to explain what can maybe the main problem : there is a little face at the ceiling of the first floor. This face is visible (and large) at the back of the house. You can see that easier if you set "face selection" mode (ctrl+tab then face)

Here is a link with this face selected : <img src="http://blend-exchange.giantcowfilms.com/embedImage.png?bid=2686" />

OK... I will be AFK too... feel free to tell me if you need more help.

hi .. sorry, it lasted a while

hi... I just come back too

so... ?

Did you found the weird face ?

it looks like a "double line"

It is a triangle in fact

if i remove that triangle is then the problem solved ?

But I don't think this face is needed and it involves some difficulties for the UV seams

I think yes

or at least, things will be simplier

ok I wil try. I have still little experience with this whole uv unwrapping

but best thing I can do is learn

When you say "remove", surely you'll need to merge the vertices at the extremity

yes I mean remove the triangle

I think you learn very well ! the model is good and the main point is that it was difficult to see the ceiling (that's why I have shifted all in the last file I sent you)

So, if you are ok, I will go... ?

yes thanks a lot !!! I think your advice worked

when looking for how to set seams are there any good guidelines ?

ok good! Have a nice evening Old Man

Guidelines... mmm

To me all depends on what you want/aim to do about textures

If you want one for all, or if you want several... or if you intend to bake or paint or use existing textures

ah ... ok... you mean that you have a good idea about texturing the model and that is guideline for seams ?

To me all that is what is leading the way you will seam (or use one or more materials)

Yes that what I meant

ok that is a good guideline

thanks a lot for your coaching !!!

have a nice evening

I hope (remember I am not professional !!)

You too, thanks

I think you are very smart :)

bye bye :)

who knows : ))

bye bye