I've been trying to use panoramas stitched from 2-4 images for making 3D models of some building in ImageModeler.
So far this has been less than successful as I can't even get it to calibrate the cameras.  
What should the settings be in Stitcher (and ImageModeler)?
Any tips or tutorials on this?

Hello,
 
Check the following posts:
http://www.realviz.com/board/viewtopic.php?t=876
 
Hope this helps,
 
Stef

 
It guess it does help a little,but I still can't get it to work right.  
I tried the cylindrical and spherical modes first, which didn't work.
Maybe my panos aren't good enough? I shot them without a tripod, but there is really nothing in the foreground, so the parallax problem can't be that big.
 
I saw a guy (Greg Downing?) that had done some impressive IM models from 3 and 4 panoramas in Stitcher, and then modelled further in Maya. He had a pdf file showing how he had done it, and the pdf clearly showed that he was using cubic panoramas.  
How is that possible in IM?
 
I think I saw the examples somewhere on this site, but I can't find them again. It was a plaza (French?) and a subway station.
 
It's also quite strange that the focal length seems to almost always be exactly 24mm from Stitcher?
When I render in Stitcher I usually set a render area that is not centered, but in IM it still shows up as principal point 0.5/0.5 for the imported camera. Shouldn't this be a different value?
 
Another camera/image setting that I can't find documented anywhere is the Screen Depth. What is that supposed to do/be?

Hello bjornkn,
 
  To simulate a shot from a camera, you have to render in planar mode in stitcher.
No Cylindrical or Spherical render, as it won't calibrate in IM, because it doesn't correspond to any camera IM knows ...
 
Cubical render is a particular planar mode (six planar rendered images of the 6 faces of a cube), so this works also.
 
The web site of Greg Downing's work: www.gregdowning.com
 
Regards,
 
Stef

About the principal point (PP):
 
We simplified a little bit the calibration process in IM3.x, and this parameter is set to (0.5 0.5) by default, and you cannot change it in the interface ... :-((
 
However, you can change the PP in the RZI file (ascii file) and it should take it in account in the next calibration.  But carefull, you have to be sure of the PP you enter by hand.
 
Screen Depth: the screen depth is only a display value = distance between the camera and the "image plane" where the image is mapped.
 
 
Stef

But when the principal point is always .5/.5 will that not make it impossible to correctly calibrate a stitched panorama, unless it's prefectly centered?
 
Shouldn't this PP setting be stored with the camera file?
 
I tried changing the Screen Depth, but couldn't see any visible difference. Guess it's not that important, but it is confusing with an editable value which is not documented.