Hi ronald,
 
I notice that when solving for the camera the numbers spin when calculating each step.
 
Usally with good 2d tracks and good survey data this number is below 0 and ranges from 0 > 1 .    eg.   0.35879 and so on. and provides an excellent 3d camera
 
recently i have been doing some  very solid 2d tracks and having very accurate survey data for 10 tracks or more.  
 
In most cases the computation numbers are well below 0 but in this case the numbers have been in there hundreds or even thousands and now it gives this ( see attached) It still computes but takes much longer and in some cases the progress % actullay counts backwards.
 
is it worth waiting for the computation to end or is this an idication of an error somewhere in the 2d tracks or survey data.
 
regards,
 
Michael

Hello,
 
You're right... This figures are related to the currently computed features (either frames or tracks) quality. Therefore, going into hundreds or thousands usually leads to bad results. In some cases, the computation cannot be done and you have division by 0 (your screen shots). You'd better stop the computation and start investigating.  
 
One easy way if you're stucked,  is to use the work area and reduce the number of computed frames to only a few. If it starts fine, you can then add frames gradually. It will help you find out where the problem lies.
 
Hope this helps

thanks ronald for your help
 
i put the work area to the first 100 frames only which worked fine, i then increased the work area to 150 and re-solved for the camera but it calculated all 150 frames again. is there a way to keep adding to the allready solved area without re-solving for the entire work area
 
I also tried sovling from 0-100 using the work area and then changing the work area to 100-200. this wiped the 3d solved tracks for frames 0-100
 
Thanks in advance

Hello,
 
You should use the extend camera tools. It depends on your version of MatchMover. On the last one (3.1), use Extend Camera to add new stuff and refine already computed ones, or use Extend Camera Fixed to only add new stuff.
 
Bye

thanks  
 
 
still having trouble with this track.  
 
it seems that when i remove the survey data from the manual tracks matchmover can solve the sequence but the rsults is skewed slighty and not accurate enough.
 
I have good survey data that i know is accurate (in mm)  
the site is big though, so some of the tracks are 30 to 50 meters apart but i am entering the data in as mm. this should not effect anything should it?
 
Can survey data be added to the manual tracks once it has been solved?

Hello,
 
The unit should not be a problem... Using survey data may sometimes lead to bigger residual, because of the strong constraint they imply, but the result will definitely be more accurate.  
 
If you want to force the 3D coordinates of a track after solve, you can just edit its 3D or survey coordinates, but other tracks and camera wont benefit from these constraints, which are more useful before solving.
 
Bye