WorldViz User Forum - Jumping and Noise in head tracking

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cyclonseye

07-27-2010 02:07 AM

Jumping and Noise in head tracking

Hello

My name is Hyeob Choi, and I am using Vizard and EVarT for head tracking

and making vision correspond to head track information.

I made a body in EVarT, and Vizard reads the body's information(6 DOF).

Then, I linked view point and the body, and I could make head tracking vision.

However, there is a problem.

The vision periodically jump.

It is unrelated to EVarT. It also jumps when EVarT is not turned on.

Why does it happen?

Another question is about noise.

There is some noise in EVarT information.

I want to ignore it, although head tracking sensibility decreases.

How can I do it?

I would really appreciate your help.

Thanks.

Jeff	07-27-2010 12:49 PM

Is the framerate in Vizard dropping when you notice this jumping? You can check that by pressing F4 when your script is running?

cyclonseye

07-27-2010 07:55 PM

Quote:

Originally Posted by Jeff (Post 10464)

Is the framerate in Vizard dropping when you notice this jumping? You can check that by pressing F4 when your script is running?

No. The frame rate is always 59~60, but the vision jumps.

Jeff	07-28-2010 07:52 PM

You mentioned this also happens when the tracking data is not used. Does this happen with standard mouse navigation and a simple model like the following?

Code:

import viz

viz.go()



gallery = viz.add('gallery.ive')

If not, can you post a sample script that replicates this without using tracking data?

cyclonseye

07-28-2010 11:05 PM

Quote:

Originally Posted by Jeff (Post 10482)

You mentioned this also happens when the tracking data is not used. Does this happen with standard mouse navigation and a simple model like the following?

Code:

import viz

viz.go()



gallery = viz.add('gallery.ive')

If not, can you post a sample script that replicates this without using tracking data?

In your sample code, vision jumping does not happen.

Following is my code.

Code:

import viz

viz.go()



viz.add('court.ive')

viz.collision(viz.ON)



evart = viz.add('evart.dle',0,'192.168.0.3')



body = evart.getBody(0)



link = viz.link(body,viz.MainView)

Jeff	07-29-2010 12:43 PM

Does this jump occur when the body is still or only when it's moving? How far is this jump?

What is happening the EvaRT GUI, do you see the body jumping from one position to another? Is the body getting occluded?

cyclonseye

08-01-2010 06:16 AM

Quote:

Originally Posted by Jeff (Post 10491)

It always occurs, whenever vision is moving or not.
How far is... about 4,5 cm?
If you want, I can send a movie that shows vision jumping.

In evart, there is no problem. The body never jump.

Jeff	08-02-2010 10:25 AM

Please upload a movie to the following:
http://www.worldviz.com/support/upload.html

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