UV mapping

I am dealing with uv mapping now and I am looking for posts that are discussing about it and also if possible teaching videos or manuals.
If somebody could point me to links for these resources
I use Blender 245 on a linux 64
I experience quite a lot of issues here as I don’t really understand the method to uv map a photo or image.
Thanks you
Yves

Yves,

Here are some links that may be of interest. I do not assume that you have already read through the wiki manual.

http://wiki.blender.org/index.php/BlenderDev/UvUnwrapping/Suzanne
http://wiki.blender.org/index.php/Manual/UV_Unwrapping_And_Texturing
http://wiki.blender.org/index.php/Tutorials/Links#UV_Mapping

Best of Luck!

thanks OBI
I have read the wiki and if it was possible I would send the blend file with the model I have created.
The model is a chair and the project is to make decorate the chair with a pattern that is a photography.
I can attach some pics to give you an idea of the current state of my project.
Where I have problems is in positioning precisely the artwork on a specific part of the chair. It works for some, but I don’t seem to be able to make it with other parts??? :-((
Anyway I will be looking at your links and maybe find where I am missing something.
Thank you very much for your help
yves

Attachments




How can I know the relation between pixel from a photo and placement on a UV mapped area? If the photo is wider than the space, how do I place it inside or down scale it without losing resolution or definition?
Also as I move the camera some of the textured areas seem to move with it and stay facing the camera. how can I tell to the system to keep the same orientation whatever the camera does…
I must miss a lot …
Thanks for any help
Here is a finished state but not satisfactory for the project…
yves

Attachments




Yves,

If you would like, you can upload the blend file here. You will have to register, but it is free, and no adds. This is where allot of BlenderHeads upload and share files from for getting help.

http://uploader.polorix.net/

I just uploaded two files, one is an obj and the second that is a blend file.
The main one is the blen file where if you do a render you will see that the right side is not as well positioned than the left side.
I did a test that is the obj to position precisely the asset on the inside back, but there again i did not get it .
thanks for your help
yves

yvesbodson,

Now you need to post a link to the files so I can get to them. Otherwise it will be impossible for me to find the correct files.

I am not sure that this is the right way to get the link but here it is…
http://uploader.polorix.net/browse.php?action=info&userid=1084
Hope it works

I have posted another blend file where I can’t render a specific part of the chair.
Everything else renders but that one…
http://uploader.polorix.net/browse.php?action=info&userid=1084

yvesbodson,

We are almost there. The link that you posted is to your account, not to the specific file. You either need to make the folder that the files are in “Public”, or paste a direct link to the file(s). I recommend pasting a direct link to the files as described below. If you make the folder public, anybody can browse the contents.

While logged into uploader.polorix.net, place your mouse over the file, then rmb “copy link location” (at least that is what Firefox calls it), then paste the link into the post.

For instance, here is a link to a blend file that I posted showing a method for soft shadows:

http://uploader.polorix.net//files/453/softshadows.blend

Sorry for that…
That should make it now…
The two following links are without the seat, only the chair. The reason is that I don’t seem to be able to get the seat rendered.
http://uploader.polorix.net//files/1084/Fuckup%20Cac02%20chair%20assembly%20seat%20parts%20v2-C%20front%20view%20%20.blend

http://uploader.polorix.net//files/1084/Cac02%20V2%20chair%20assembly%20parts%20v2.blend

this one is specific for the seating and I still cannot get the texture rendered onto it… that really puzzles me because everything else works…
http://uploader.polorix.net//files/1084/Cac02%20chair%20assembly%20parts%20v2-C%20front%20view%20%20.3ds
Thanks you very much for your help
yves

How do I make my folder ‘public’? I could not find out the command for that…?
yves

I finally think that I found out what was the issue. I used a tiff file for the texture and it seem that Blender does not like the tiff format because changing it to a jpg did allow the rendering to work…
Still I could not find out how to place precisely a texture on a surface…

yvesbodson,

I think when you create a new folder (sub-folder) you have the option to make it public. I’m not sure about total space, but I know that all files must be under 200 mb.

Now, on to your model. You will ha trouble matching up uv images when the chair is made up of several objects. You could join the meshes, but in your case, that will not solve the problem, as the individual meshes do not line up. See the attached picture of the back of the chair and one of the arms.

Idealy, if you need to have the texture line up perfectly, you would want the object to be a single mesh, and you would need to add seams to unfold it correctly. I will put together a small example, and post the file.

Attachments


yvesbodson,

Here is a very simple example, a very square chair. Note that even when the geometry is very simple, it can be difficult to get the image (courtesy of www.imageafter.com) to wrap around all surfaces without distortion. In the UV editor, try moving some of the uv’s to eliminate all of the distortion. It will be a bit difficult. Now take a look at a real chair, and you will see that patterns do not line up. In particular, look at the arm of the chair in the image (top right). You will see that the pattern does not wrap over the top of the arm. That is where there is a seam in the fabric.

So, if your goal is to have the chair look like a real chair, then you can leave the chair as separate parts, and not have the textures line up.

If your goal is to cover the chair with a single image, and have the texture flow seamlessly from one part to another, then the chair will have to be a single object and a single mesh, and you will have to unwrap the mesh in a way that gets the results you are looking for.

I wish I could be more help, or offer an easier solution. Try a few different methods for unwrapping the simple chair to get a desirable result, and you will see the difficulties with more complex geometry.

The file is packed (includes image), and compressed (In the Blender file menu…Compress File).

http://uploader.polorix.net//files/453/simplechair.blend

thank you OBI for your comments
The project is for a play and they plan on projecting the image of the chair as a background in large size… Otherwise they will have to paint it like a regular drop.
I will work on this week end to see if I can have the parts fitting correctly .
Thank you very much for your help.
yves