Hi  
 
I have had this happen in two projects I am doing currently.
 
One project is the inside of a cathedral, the other is the outside of a wedge shaped building (similar to the famous one in NewYork).
 
The same thing happens in both projects -  
 
I have about 5 images all calibrated together - in total around 30-50 locators.  All locators are green, and with a low error (sub 1pixel - when the images are 3000x2000 resoultion).
 
I want to place a new photograph just to get some better angles, and maybe to improve and lock down calibration in a few areas.
 
I add the new image - and start placing EXISTING markers in the new shot.  I add a couple of NEW markers.  NOTHING will now calibrate.  This shot is something that should easily calibrate (in both projects actually) it isn't from a radically different camera angles, and locators are nicely distributed over the entire image.
 
In both instances the new image just WILL NOT calibrate.  I figure there must be something wrong with the image - something IM doesnt like.  So I delete the image out of the project.  I also delete any NEW markers that I put in the scene.  So now we are back really to where we started before I imported the image.
 
Will the scene calibrate now???? NO!!!!!!!!!  This is now no different to before I imported the new camera shot.   There is no new locators in the scene.  I have no idea what is going on.
 
Further to this - if I try and add any new locators, they either stay grey (this is new locators in existing, calibrated, shots) - or when I calibrate it says that the calibration isn't optimal - and if I click OK - over half the locators turn RED!!!!!!!!!
 
This seems like a big old bug to me.  The scene is fine, I import an image, place a few markers - delete the image and the markers, and now nothing will calibrate.  This isn't just a one off - this has happened in both projects I am working with.
 
Some info about the project setup:
 
All shots are taken with the same camera, at the same focal-length setting.  I have all shots using the same camera device, with the focal-length set to Variable, and the distortion set to constant.  This seemed like the best setting to use for the start of project - since all shots are taken with the same camera and lens setting (I know the lens setting is the same - because it is fully zoomed out on a digital SLR - Nikon d100).
 
 
 
I like image-modeller, but the more I use it, the more I find bugs like this which I just cannot explain.  The project goes fine, and then all of a sudden, nothing seems to calibrate - and goes from an all green situation, to an all red situation with nothing working.
 
 
Any help would be gratefully received.

Hello,
 
  Please send your project at support@realviz.com so we can check it here.
 
If you add a new shot in a calibrated project, and if you do not want that this shot changes to much the previous calibration, add few markers in this shot (4 or 5 should work if you choose only existing markers)
 
Best,
 
Stef

I had this once.... or was it twice.... anyway, what I did was to change the camera settings (like all on Variable), and reforced the calibration from there, and it worked...
 
Dunno, maybe worth a try...
 
BTW, you're right... there are many bugs...
 
Hello Stef, when is the new version coming out...?

I've got exactly the same problem here in IM 4.0.2.  Should I also email my project?  Do you need the images with the project?

Hello Graham,
 
  The latest versions of IM are IM4.0.3 (PC) and IM4.0.5 (Mac). You should update your binary to 4.0.3.
If this problem still happens, send project (with images) to support@realviz.com.
 
Best,
 
Stef

I am using IM 4.0.3 and have encountered similar problems with calibration in the past. I read a thread here that suggested setting up a simple test object to get the camera lens information, and then using that info to enter into a more complex scene, so all the camera info was known instead of having IM figure it out.
 
I have not been able to follow up on this yet but it seems reasonable, assuming I am using pictures taken with my own camera at fixed zoom settings.

Has this issue ever been reliably resolved???
 
I am using version 4.01 and am experiencing the same problems with calibration when adding new points after the camera automatically calibrates. New markers show up as grey locators, and if I force a calibration again, the whole scene goes red. This is very unreliable, as I am unable to locate enough points in a high-density picture in order to build high-accuracy models.  
 
Is there a workaround???
 
Very dissapointing if there is not -- ImageModeler would be totally unreliable tool and not usable in a production environment...