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 Post subject: Arm length
PostPosted: Wed Jul 07, 2010 12:23 am 

Joined: Tue Apr 27, 2010 6:43 am
Posts: 18
Hi,
to begin the capture, I must first set up the T-Pose.
So in the Actor-Tab, I can make various settings. Among other things, the morph of the arms. Here I miss the opportunity to set the length of the arms.
My problem is, that while recognizing the T-pose, my arms are bent, even though they are. Guess that comes from the fact that my arms are too long.

Best regards

Stephan


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 Post subject: Re: Arm length
PostPosted: Wed Jul 07, 2010 5:11 pm 

Joined: Sat Aug 08, 2009 4:08 pm
Posts: 91
Location: Los Angeles
s.app wrote:
My problem is, that while recognizing the T-pose, my arms are bent, even though they are.

I'm not sure I understand what your saying...


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 Post subject: Re: Arm length
PostPosted: Wed Jul 07, 2010 11:13 pm 

Joined: Tue Apr 27, 2010 6:43 am
Posts: 18
Sorry for my bad english.

I mean:
My problem is that while recognizing the T-pose, the arms are bent, even though they are straight.
My arms are longer than the arms of the figur.

So while refit the pose the software try to lay the hands of the figur over my hands.
The effect is, that then the arms/elbows become bent.

I hope this is better to understand.

Stephan


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 Post subject: Re: Arm length
PostPosted: Thu Jul 08, 2010 11:12 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2361
Location: Los Angeles
Hi,

What clothing are you wearing? It's recommended that you have a color long-sleeved shirt (bright red or green may work well depending on your background,) with a black short-sleeved shirt pulled over it. The idea is that this helps separate the arms from the body and makes it clearer how long they are and where they should bend. The black t-shirt serves two purposes: to help separate the arms, head and hips from the torso, but the color also reduces shadows being cast by the arms and head, which may confuse the tracker.

G.

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 Post subject: Re: Arm length
PostPosted: Thu Jul 08, 2010 12:00 pm 

Joined: Tue Apr 27, 2010 6:43 am
Posts: 18
Hi,

at the moment I try it with a blue sweater.
But I will try to use a red or green pullover and a black short-sleeved shirt.

Thanks
Stephan


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 Post subject: Re: Arm length
PostPosted: Thu Jul 08, 2010 12:49 pm 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2361
Location: Los Angeles
Just to be clear, the actual color of the long sleeves really doesn't matter as long as it's different from the rest of the body and stands out from the background. In other words, you want to improve the contrast of the limbs for the tracker.

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 Post subject: Re: Arm length
PostPosted: Sat Jul 10, 2010 9:39 am 

Joined: Sat Aug 08, 2009 4:08 pm
Posts: 91
Location: Los Angeles
Greenlaw wrote:
you want to improve the contrast of the limbs for the tracker.

Is the tracker color aware?


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 Post subject: Re: Arm length
PostPosted: Sat Jul 10, 2010 10:40 am 

Joined: Mon Aug 03, 2009 1:34 pm
Posts: 2361
Location: Los Angeles
Info Central,

I'm not sure. Possibly not, which may be why emphasis is on contrast.

FWIW, I'm using a green chromakey backdrop and I have a red long sleeved shirt under my black T-shirt, and DMC seems to track well for me now, though I imagine the gray values of the red and green may be similar, so I don't really know. I'm pretty sure it's using color to create a difference matte to separate the performer from the environment, and that may be where color choice is important. (This is just my guess about what's happening on under the hood, as it's not actually documented anywhere.)

Stephan,

I don't know if you're already doing this but one thing I learned that you must to do when setting the T-Pose is to alternate between clicking Refit Pose and Analyze Actor several times. Until recently I didn't realize how important this was, but this procedure seems to have a big effect on improving accuracy after you press the tracking button. It is even clearly stated in their tutorial video, but somehow I missed this step. Since I started doing it, problems like poorly fitting arms and crossed legs seem to have gone away.

Hope this helps.

Greenlaw

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Greenlaw
Artist/Partner - Little Green Dog | Demo Reel (2017) | Demo Reel (2015) | Demo Reel (2013)

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Last edited by Greenlaw on Sun Jul 11, 2010 11:19 pm, edited 2 times in total.

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 Post subject: Re: Arm length
PostPosted: Sun Jul 11, 2010 6:21 am 

Joined: Sat Aug 08, 2009 4:08 pm
Posts: 91
Location: Los Angeles
Great tips and thanks...


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 Post subject: Re: Arm length
PostPosted: Tue Jul 13, 2010 2:48 am 
iPi Soft

Joined: Wed Apr 07, 2010 4:33 am
Posts: 379
Stephan,

try to set a larger value for actor height. As a rule even for well scaled scenes actor height should be slightly larger than the real height of the actor.


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