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Feet not flat on floor when tracked
https://forum.ipisoft.com/viewtopic.php?f=2&t=5866		 Page 1 of 1
Author:  aodusany [ Thu Feb 23, 2012 8:03 am ]
Post subject:  Feet not flat on floor when tracked
Hi I am a newbie with the 30 day trail ipi soft.
I have a Kinect connected to my laptop. All seems well.
When I send the video to my ipi studio the image goes in fine. However when i do auto track one of the feet do not seem to be flat on the floor, during the video when doing forward tracking some of the time the foot seems to lift and tilt. When finished i have done the process of sending into Poser 2012. In poser the feet sink into the ground and at times are at a tilt. I have experimented, and tried to find the answer on the net (no luck as yet). Can anyone help please????? I guess I could tweak in Poser, but that would take a long time.

This day three using the software, very good - well impressed.
However, thumbs up to ipi, because before that i was animating frame one frame at a time.
Author:  gcookman [ Fri Mar 16, 2012 7:06 am ]
Post subject:  Re: Feet not flat on floor when tracked
neebie here too, you seem to be able to get BVH into Poser 2012 which is what I'm trying also but I just get a twisted mess of a character and lots of warnings of no match to figure parts. Any advice appreciated, gav
Author:  Greenlaw [ Fri Mar 16, 2012 10:10 am ]
Post subject:  Re: Feet not flat on floor when tracked
There are several things I can think of may cause the feet to lift:

1. Make sure you have feet tracking enabled.

2. It's possible that the Actor is not fitting your physical volume correctly. Adjust the scale and proportions of the Actor (I think proportions is only for Kinect--need to check. Scale is important for both systems.) For many people, a little taller seems to work better but this really depends on your body proportions. Experiment to see what works best for you. Remember to save your Actor template so you can call it up again later.

3. You may need to occasionally hit Refit Pose to insure good tracking results. If you're using PS3 Eye, it sometimes helps to hit Analyze Actor and Refit Pose every now and then to correct for changing light/shadows. Don't worry about the colors iPi chooses for the Actor...let it work with what it wants.

4. Poor calibration may also cause problems. With Single Kinect, calibration is automatic so if there is a problem, it may have to do with the environment. Avoid rooms that have a lot of black or extremely bright or reflective surfaces (like windows.) This applies to both Kinect and PS3 Eye (though for slightly different reasons.) For twin Kinect or multiple PS3 Eye, make sure you follow calibration instructions carefully. If you're calibration is bad, all your motion data is pretty much useless.

5. Make sure you have a clean BG video--without this, iPi Studio cannot isolate the performer from the background and it will result in poor tracking results. If you didn't record the BG video at the head, try to find a couple of seconds at the end--you can define the range for the BG video anywhere on the timeline by sliding it, just like Takes.

If you have all that, iPi DMC should be able to give you good results with good feet tracking.

Now if the feet movement is jitter related, that's different. Use Configurable Jitter Removal to apply stronger jitter removal on the legs. This will 'lock down' the feet solidly in most situations involving jitter.

If the feet are turning (as opposed to lifting,) it's because the iPi Actor has are limits imposed on the hip joints and it is unable to twist/roll it's thighs. This is not a bug; my understanding is that it's designed this way to prevent more severe issues that can happen if the rig didn't have these limits. If you see this problem you can easily correct it in a mocap editing program. I use Motion Builder but many other 3D programs should have tools that let you do this. Fortunately, it doesn't occur very often and sometimes it's not that noticeable.

Good luck.

G.
Author:  aodusany [ Mon Apr 23, 2012 2:13 am ]
Post subject:  Re: Feet not flat on floor when tracked
Hi, Found a solution to the feet problem.
I found that if I wear trainers instead of flat slippers, this reduces the lift of the feet, and the feet appear flat on the floor (very strange that, but seems to work for me).

Thankyou for the info about the actor proportions and Configurable Jitter Removal.

For the poser user this worked for me: Export your figure as a bvh file when in poser, then import into studio as 'import target charater'. Then when you export the bvh you have made in studio (it will send over as the correct rigging as your figure). Hope that helps.
Author:  Greenlaw [ Mon Apr 23, 2012 7:16 am ]
Post subject:  Re: Feet not flat on floor when tracked
That reminds me: When I was using the PS3 Eye system a long time ago, I ran into problems with feet tracking. The issue turned out to be the length of my pants cuffs, which covered my ankles and this must have made it harder for iPi Studio to tell where the bottom of the feet started. The solution was to simply roll up the cuffs to clearly expose the feet.

These days I mainly use the twin Kinect setup but I still roll up my pant cuffs when they are too long because iPi Studio generally uses the same tracking system for either setup.

Just something else to think about.

G.
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