Character Jiggle

[bsteagal]

Hi Seth

I noticed your post on this, what is the function of changing "min line" from 3 to 2 on 6-12 camera setups? Just curious

thanks!

bryan

[NaturalPoint - Mike]

Changing the minimum lines from 3 to 2 allows the system to detect a valid point with only 2 cameras seeing it, as opposed to 3. This helps considerably in 6-12 camera setups by allowing detection of a point even if one camera is occluded. It should only be raised above 2 in low camera number setups to help filter out ghost markers.

[Seth Steiling]

Yeah, basically it's just a trade-off. Higher min lines should provide more accurate data, but lower min lines will provide more stable data. For animation, I find stability (less clean-up) to be much more important than accuracy--especially when the data is still going to be quite accurate. And the more strict you are with the accuracy (higher min lines number), the more likely you are to have markers jump in and out frequently. In that case, when the marker is tracked it might be more accurate, but it also won't be tracked as consistently.

[bsteagal]

Thanks guys! This is good to know!

b

[kitesflyer]

Hello-
Seth,sorry about that,actually i need a solution really quick thats why i tried to get it through to every post where they were considering a jitter or a skeletal shaking.Now on I will post once only.

1. we are fixing our six cameras in a 15'x 20' room and the cameras are fixed on stands of 7'.Though the height of the room is more than 13' but we have to keep the cams to 7' because of the uneven room size.

2.cameras are in Landscape orientation

3. we are aiming a capture volume of 7'x7' but we end up getting
4'x 5',will adding 2 more cams and getting a bigger setup area
be any help?
4. I am using 6 x OptiTrack FLEX:V100R2


I have gone through all the training material from you and there is no problem with me in wanding and calibration,initially we struggled a lot with calibration as we were not getting excellent in most of the cases we were trying for about 2-3 hours with fair poor or bad on our board,but with practice we can now get excellent calibration on 6 of the 6 cams in a try or two.i will set the "Min Line" to 2 and try again. thanks for your support Seth.You have a nice one.

[NaturalPoint - Mike]

Hello KitesFlyer001 -

We recently outlined a fairly solid calibration technique here. It would probably be a good read if you're looking to remove jitter.

[kitesflyer]

Hi
i am also starting to think if my reflective marble floor in my capture area is what is giving me a hard time,sometimes I find the camera Led,s being reflected on the floor,any ideas guys?

so what kind of floor is best for the capture set?

[bsteagal]

Hi Kitesflyer001

Yep.. reflective floors are not a good idea.. carpeting would help, at least in the area where your cameras are...

[NaturalPoint - Mike]

We have shock absorbing mats as the base for our capture volume (similar to the kind of floor mats you would find in a wrestling or martial arts studio). Not only do they have a matte finish that does not reflect light, but they are very comfortable to walk on during long motion capture sessions, and they are broken into modular sections so we can easily disassemble and move them if need be.

In a pinch, it would be possible to use a large heavy canvas or floor rug to cover the floor of the capture volume if you need to cut down on reflections. Normally I would recommend paint, but not with marble flooring.