Hi Alessia,
A few thoughts, after watching your video and reviewing the data you sent in to support...
Regarding your custom marker template:
- While it
is possible to create custom face templates, you are adding a pretty significant number of extra markers. This still might be doable--I don't know of anyone that's added this many markers, so I can't confirm--but in the event that you challenge the system with a more difficult point cloud, you're going to need to augment it with more tracking capability if you want to have the best chance of being successful with your custom arrangement.
- I can't tell which marker size you are using, but if you're tracking lots of markers, it would probably be best to go with the smaller 3mm markers.
- You certainly will want to use more than the minimum camera count. Sounds like you're going to try 12 cameras--this should give you a much better chance of succeeding.
- Narrower FOV lenses--like the 5.5mm lenses we sell with face packages--will offer improved resolution, which can greatly assist in resolving the small markers used in face tracking. It looks like you're using 4.5mm lenses, which might still work, but will not perform as well as the 5.5mm for this particular type of mocap. (If you're using 3.5mm lenses, I would
definitely recommend swapping out, as they are not designed for face.)
- Camera aiming becomes especially important when you're stressing the system. The more you challenge it, the less margin you have for error. In the video (@ 5:10 or so), it looks like many of your cameras are not aimed directly at the actor's face--in some cases even cutting off part of the markers completely. You should re-aim accordingly, as others here have recommended.
- The cameras also appear to be spaced too far apart, and potentially a bit too high/low. This is indicated by the steepness of the angle at which several of the cameras are seeing the markers:
If you were to bring the cameras closer together, or add additional cameras in between the inside and outside pairs, this should help. You want as many cameras as possible to see most/all of the markers, from slightly differing perspectives--especially at lower camera counts. You need at least a foot or so of distance between them, with 2 feet often serving as a nice distance, but 4-6 is probably too much. At that point, they don't share enough common coverage of the markers, which can result in the kind of tracking you're experiencing.
Hope this helps! While all of the above is especially important if you're taxing the system with custom, high marker point clouds, it all holds true when using a stock template as well.