Jumping and Noise in head tracking

[cyclonseye]

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]

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

[cyclonseye]

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]

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?
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]

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?
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.

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]

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]

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?


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]

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