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which is the best distance between camera
https://forum.ipisoft.com/viewtopic.php?f=2&t=5264		 Page 1 of 1
Author:  irridas [ Sat Aug 13, 2011 2:55 pm ]
Post subject:  which is the best distance between camera
Hello,
in the wiki, scene set up for three camera, we can see in the order;
H1 to left, h2 on center and h3 at the right

but in the wiki calibration in capter 7;Set scene scale using camera height as reference
we can see a different order.
the camera two is at the right.

my question is:

which is the best distance between each camera ?
and which is the distance between the center camera and the actor ?

and: do i need converge the three camera at the center ?

thanks
Author:  Pat [ Sat Aug 13, 2011 3:28 pm ]
Post subject:  Re: which is the best distance between camera
It all depends on how much room you have to cap in. If you are using the three camera setup I would probably say about seven feet between each camera positioned in a semi circle, with each camera being at a different height. Ideally you want your entire body to been 'seen' by each camera. Turn your monitor to face you and walk towards the center camera. Once your feet are about to exit the frame, mark the ground with gaffers tape or masking tape. That mark will be your stop point. Do the same for the other cameras. Once your area is masked off, this will be your area of play.

This is my opinion. There are people on here who have far more experience that I do with this. :)

Good luck! And happy capping :)

Pat
Author:  irridas [ Sun Aug 14, 2011 3:23 am ]
Post subject:  Re: which is the best distance between camera
Thanks Pat !
but not happy capping !

i have two difficulties.
one for calibrating.

i have in the order:
cam1 to left height 1.20 m
cam2 center height 1.90 m
cam3 to right heiht 1.50 m

the distance between each cam is more 7 feet (2.13m) i have 2.60 m
i have a demi circle

and when i adjust the orbit, pan etc.. of camera i can't get a good background.
when we look the frame of the room i have a good background and so i try to adjust the perspective (the real perpective).

but it's not possible. the background of Ipisoft is always floating above.
and so ,after calibrationg, the actor is always above the background.

in the calibrating i get five background marker.

after capture actor, the feet are always above background
and the real scale of actor is not correct after adjust.


the another question:
the tracking of hands is always failed.

thanks for your idea .

PS. my room is 8m*6m = 48m2
and perhaps... the light is a daylight by big windows.
Author:  Pat [ Sun Aug 14, 2011 10:40 am ]
Post subject:  Re: which is the best distance between camera
WOW! I've never experienced that. Just to make sure I'm understanding, is the ground plane floating above the character?
A few questions: Are you using a laptop or a desktop? In general, laptops don't have a proper video card capable of handling IPI's capture. That may be your issue (the video card), but again, I don't have as much experience as others on here do. Also, what cameras are you using? If you are using the Sony Eyecam they shouldn't need calibrating (from what I understand).

Ipisoft cannot track hands or head turns. Those will have to be animated separately. However, what you can always do is place reflective stickers on your fingernails then import the video as a background into your animation program and Rotoscope manually the finger and wrist motion. But it's easier just to keyframe the fingers.

Two people you should contact are Greenlaw and Mr. Bones. They can REALLY help you wit this :)

Hope this Helps.

Pat
Author:  Greenlaw [ Sun Aug 14, 2011 11:35 pm ]
Post subject:  Re: which is the best distance between camera
I agree with Pat; this sounds similar to a problem reported by another user and it turned out to be a graphics card issue.

What graphics card are you using? iPi Studio requires a graphics card with SM 4.0 support. Intel Graphics (found standard in many laptops) is absolutely not supported, and many older Nvidia or ATI cards can have problems. Nvidia GTX 250 or better is recommended but personally I recommend GTX 460 or better. A GTX 460 is fairly inexpensive these days and the speed improvement over the GTX 250 is HUGE. The different in tracking time can be minutes vs. hours. Obviously, if you can afford a better card, the times will be even better.

I remember seeing a chart somewhere in the wiki with performance benchmarks. Worth a look.

G.
Author:  irridas [ Mon Aug 15, 2011 4:39 am ]
Post subject:  Re: which is the best distance between camera
Hello Pat, hello Greenlaw
thanks.
I'm working on dual xeon . with nvidia 460 gtx. win 7( i can tested on workstation with quadro 5600)
the same thing..

i'm capturing to 60 fps. (without drop)
raid 0 for disk.

the calibration is ok (no red track)
i think that i didn't understand the calibration.

about hand tracking , i agree with Pat.

but.
the refit function is correct.
and at the start analyse, the traking loss the forearm and so the wrist.
for the feet, there are a lot and lot artefact.

about background , it is under the feet of actor.
but not align with real perspective of my room.
do i need a real background ?

i would like just receive a sheme (jpeg or pdf) of correct position for three camera into a 14*14 feet room.


thanks a lot again for your support.
but i'm waiting a answer from the great team of ipisoft.
oups, sorry for my english .
Author:  Pat [ Mon Aug 15, 2011 7:52 am ]
Post subject:  Re: which is the best distance between camera
First off, your English is fine :) The alignment doesn't have to be perfect, just try to match the IPI character as best you can to the video T Pose. It sounds as if your computer is fine. I run a 2 GIG Nvidia in a quad core system, so I'm able to render each frame at just under a second. Yours should be doing the same. Have you tried tracking in reverse?

Again, Greenlaw and the others may have better advice.

Pat
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