UV Mapping Help!

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1

Hello,

I am a Blender noob and I am seeking help with UV Mapping.

I made a building in Unity that has 88 windows, I was wondering if there was a easy way so that on the UV Map all the windows are in the same place because they will be aesthetically identical.

Thank you

2

Are you saying each of the 88 windowsis not just an instance of the one mesh in Unity? When you say thatyou made it in Unity do you mean you placed 88 instances of a windowin a scene and then used something like an obj exporter to export themesh out of Unity?

If so can you not just uv map the meshyou instanced in Unity then export?

If you didn’t create the windows like Isaid above, did you use some Unity addon or did you create the meshes in script?

3

I can edit my post and it updates immediately but if I post a second/third message (which I have below) the admin still has to approve it, lol.

4

This is a screenshot of the Blender window

building.PNG1919×1011 185 KB

The windows, the doors, and the actual building are all apart of one object.

5

I used UV Smart Project to generate a UV Map but all of the windows were in different places, but I want them to all be in one place because they are identical.

6

I don’t think there is a simple way to do this but if the windows are separate shells/elements then it would be possible to create a script that could compare mesh elements (i.e. it would need to compare them because each element would have a different vertex order) and then copy uv’s over to them.

I know you can use object->make links->Transfer uv layouts but it only seems to work with duplicate meshes a script that worked like I mentioned above would be useful but I don’t know if anyone has created one or if I’m just not seeing the option to do it in Blender.

Anyway this is how I’d do it:

  1. I would simply select the faces of just one window (you can do this by selecting one face and using ‘select linked’ which will select the whole window as long as the window is a separate shell/element) and then separate it.
  2. Next separate the main building and delete the remaining mesh that contains all the other windows.
  3. UV map the window and then attach some array modifiers to the window to create all the duplicates.
  4. Next apply the array modifiers and join/combine the meshes back into one object (Note! I don’t know why Blender doesn’t apply modifiers automatically when you join meshes.).
  5. Select the faces of the main building and uv map them and then move all the uv islands into places.

Also sorry about my first post, don’t know why it removed some of the spaces between the words.

7

What about something like:

  1. Select just the 88 window faces in the 3D editor

  2. [u] -> Reset

  3. Check each window’s UV mapping has correct rotation,

  • if needed, select the window face in 3D editor, then rotate its UV map in UV editor
  1. With all 88 window faces selected in 3D editor, either
  • in UV editor: scale and position UVs, or
  • in UV editor: [a] to deselect UV vertices, then [b] (border select) a corner and position as required.
8

Ok, I selected all of the windows and I unwrapped them, how do I move them to the same place?

step.PNG1421×926 54.3 KB

9

Are you sure you did [u] -> Reset in step 2?

It should like something like this:

window_uv_1.jpg700×600 73 KB


window_uv_2.jpg700×470 81.7 KB


window_uv_3.jpg700×230 37.2 KB

10

This is what happens when I reset, and then afterwards when I press unwrap the picture on my last post happens.

windows.PNG1240×815 24.9 KB

11

Right, so do “Step 2 [u] -> Reset”, then don’t ‘unwrap’ but follow Step 3 and 4. Make sense?