(sigh) now what have I done?
So, I built a nice mesh model of a door, put a few textures here and there,placed some nice spot lights, turned on anti-aliasing, pressed f12 and… the camera sees the whole thing reflected.
the blend file is here:
Downloaded it and rendered it here and everything seems to be OK as far as I can see. So the blend file would appear to be OK.
now, what do you mean reflected?
(though I think it is odd how your scene doesn’t lign up with the global axes)
There is nothing wrong withe blend and blender displays it correctly.
The problem is a problem of confusing views.
The left 3D window obviouly is meant to be the top view, but actually it’s a buttom view and displayed in blenders front view.
So, you expect something to be rendered that is not arranged in this way.
I. E. the large wall without a window is on the left site of the „pseudo“ top view (buttom view) and it is normal that it is on right side in the rendering, because it is on the right side of the cameras view axis which is rotated by 180°.
To avoid confusions like this take blenders topview as top view, front view as front view etc.
You set the views with the Numpad keys
7 = topview
Ctrl+7 = buttom view
1= front view
Ctrl+1 = back view
3= left view
Ctrl+3 = right view (could be the other way round for left and right view)
That sounds like good advice, Tordat, I will follow it. I admit to a lot of messing around with views etc, as I was getting familiar with the mesh input tools, and yes I did rotate the camera around its view axis at one point.
I am still not sure why this rendering comes out reflected, though. Have I somehow reflected the camera viewport?
No.
As I said in your left 3D window you look from the buttom.
If you change this few with Ctrl-Numpad1 you will look from the top at your model. And now the orientation in the 3D window is in complete agreement with the rendered image.
Simple confusion of views, no reflaction anywhere.
brains required!
(back after a week away)
OK, all is sorted out now. It’s pretty obvious that I got the view reversed before I did the data entry, and then switched back again at some point later on.
Actually, I have looked extensively and can’t find any reference to a ‘bottom’ view in the docs, or to fact that ctrl-1 gets you there. How do you tell if you are in a ‘standard’ view or in a ‘reversed’ view, since the axis indicator does not change and I can’t find any other way to tell. Now that I know the possibility of this view exists, it won’t be a problem (for me) but maybe blender should put the axis indicator in the bottom right corner instead of bottom left to make it obvious.
and by the way, intrr, I may or may not need brains but I am in possession of something you obviously lack! I suggest you go and work for bill gates.
uhm… I want sound in the sequencer, intrr stays here 
Martin