I have a large Interior Mesh which I need to Mirror to create it's opposite. I can Mirror pieces, but only the individual sub-object/group bits, not the whole Mesh. Even using Select-All does not work, as it only mirrors whichever object is selected manually... Is there a way to select, then Mirror, EVERYTHING on screen in one smooth go?

What version of blender are you using?

Version 2.49b

Are you in object or edit mode? I ask because when I did http://www.tesnexus.com/downloads/file.php?id=32203 all I did was select everything while in object mode and made the adjustments. It worked fine. *shrug*

My idea was going to be add all of the objects to a group then mirror that, but I can't seem to get it to work.
I couldn't get http://blenderartists.org/forum/archive/index.php/t-81457.html trick to work either.
Would it be possible to model one half, then duplicate it and rotate 180?

If you get no response here then try asking at a blender community like blenderartists.org or the #blenderQA and #blender channels on the FreeNode IRC network.

No matter what I select, or how, only the last thing I left-clicked on mirrors

Which model is it? I can try and see if I can do it.

The Mesh is the Bruma Upper Inn Interior (I can't check right now, but it should be BrumaUpperInnInt.nif)-- it's a large room, with a fireplace, staircase and upstairs: I want to flip the whole thing, to create a mirror room on the opposite side of the building, if possible. Thank-you for offering to help

It should look something like this :

O
OO
O

And what I'd like is:

O
OO
O

So, to get this straight, in http://i16.photobucket.com/albums/b9/bchick222/request.jpg you want option 1 and not 2 correct?

I'll take a look at it when I get home tonight!

Yes, ideally Option One

if it ends up more like

O O
OO OO
O O

(i.e., Mirrored along a plane adjacent to the Mesh, rather than the centre) that should be fine, too.

Thank-you for your help

Try this out. All I did was mirror it in Blender like you would anything (although it was mirrored along the y axis.. if you were trying to do the x axis it didn't look like it did much). I wasn't able to test it though so let me know if it looks ok and/or the collision is ok.

-edit-
For some reason my links aren't working right now... just copy and paste I guess.

www.bradleychick.com/brumaupperinnintreverse.7z

Thank-you. I've only looked in NifSkope right now (not at my CS PC, so no textures or anything), but it looks perfect I'll confirm later, but looks fine

OK, ther's a slight issue: all the faces seem to be reversed: textures from inside are on the outside... I saw the option to fix this recently, but can't seem to find it-- if you just tell me what to look for, I should be able to do it myself

OK, I found how to do that, but hit one last issue-- most of the Faces invert fine, except for bits on the Support Beams, and the interior of the Fireplace... They all seem to be part of a much larger Mesh which incorporates everything, and inverting the textus stil has no effect-- here, the textures seem to be completely gone...

So, after some fiddling about, I had another go at the Mirroring, and managed to get it working myself (Yes, I'm very pleased about that! [Laughs])-- the problem is, now everything LOOKS fine in Blender, but I CANNOT Export the .nif file... When I try, Blender either finishes instantly, producing an empty .nif, or takes about 30 seconds, and produces 2 parts of the Mesh, instead of the whole thing... any ideas?

If you want you can send me the .blend file you have or I can look at it again... not sure why the normals would have flipped haha.

This is normal in Blender after you use any of the mirror function - as everything is mirrored then, normals included. You just need to select mirrored mesh, go to edit mode and flip normals (W,0).

that's normal behavior in many 3d apps.

get it? normal behavior.

That would be great Can you PM me your e-mail? I'm going to take another look at the Mesh myself tonight.

I'm so sorry! I went to the beach this weekend and never checked this! I have tomorrow off of work though so I will look at it in the morning... I guess it is normal behavior from the mirror as I have seen it happen before. I don't know why I didn't think of it this time. I will send you the revised copy tomorrow!

Try this one!
http://www.bradleychick.com/brumaupperinnintreverse.7z