Hi Alexey !
Since a while I'm not in confidence with "point based" chunks alignment.
Indeed I've noticed too high distances between the two clouds after using this tool (The most significant is most of the time the two z-axis which have a slight different orientation...)
But yesterday I've handled a test which gave me two clouds of the same quite big area (70 x 70 m) and really a huge amount of tie points (380 000 in both).
Outside from my test, I've tried to align those two chunks based on point. One was set as referenced (georeferenced based on UAV EXIF data) and the other one was cleared from its georeferencement (cameras were unchecked in the reference pane and the model updated to completely lose georeferencement)
Here is the log, showing I've set key point limit at 60 000.
Finally it shows that the software tried to aligned the two chunks based on 24645 points, which is a very high value for this tool (I've seen so many times "Align groups by 11 points"... even when there were large common area).
Every thing looks fine... but then "Error, not enough point to align"...
What happened ?
Regards
2017-06-07 17:52:57 [CPU] photo 194: 60000 points
2017-06-07 17:52:57 [GPU] photo 197: 60000 points
2017-06-07 17:52:58 [CPU] photo 198: 60000 points
2017-06-07 17:52:58 points detected in 67.121 sec
2017-06-07 17:52:58 Selecting pairs...
2017-06-07 17:52:58 Using device: GeForce GTX 1070, 15 compute units, 8192 MB global memory, Device Compute Capability 6.1
2017-06-07 17:52:58 max work group size 1024
2017-06-07 17:52:58 max work item sizes [1024, 1024, 64]
2017-06-07 17:53:03 1004532 matches found in 4.937 sec
2017-06-07 17:53:03 matches combined in 0.17 sec
2017-06-07 17:53:03 11114 pairs selected in 0.001 sec
2017-06-07 17:53:03 Matching points...
2017-06-07 17:53:03 Using device: GeForce GTX 1070, 15 compute units, 8192 MB global memory, Device Compute Capability 6.1
2017-06-07 17:53:03 max work group size 1024
2017-06-07 17:53:03 max work item sizes [1024, 1024, 64]
2017-06-07 18:12:23 17509590 matches found in 1159.47 sec
2017-06-07 18:12:26 matches combined in 2.59 sec
2017-06-07 18:12:26 finished matching in 1234.43 sec
2017-06-07 18:12:26 setting point indices... 2796119 done in 0.374 sec
2017-06-07 18:12:26 generated 2796119 tie points, 2.74074 average projections
2017-06-07 18:12:27 removed 417206 multiple indices
2017-06-07 18:12:27 removed 15 tracks
2017-06-07 18:12:28 adding 211981 points, 231 far (10 threshold), 53 inaccurate, 289 invisible, 54 weak
2017-06-07 18:12:28 adding 36042 points, 45 far (10 threshold), 2 inaccurate, 112 invisible, 8 weak
2017-06-07 18:12:29 adding 211478 points, 235 far (10 threshold), 52 inaccurate, 298 invisible, 54 weak
2017-06-07 18:12:29 Aligning groups by 24645 points
2017-06-07 18:12:29 iteration 0: 20324 points, 0.0229821 error
2017-06-07 18:12:29 iteration 1: 20124 points, 0.0222325 error
2017-06-07 18:12:29 iteration 2: 20110 points, 0.0221866 error
2017-06-07 18:12:29 iteration 3: 20108 points, 0.0221801 error
2017-06-07 18:12:29 iteration 4: 20108 points, 0.0221801 error
2017-06-07 18:12:30 Not enough points to align
2017-06-07 18:12:30 Not enough points to align
2017-06-07 18:12:30 Finished processing in 1239.09 sec