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FreeTrack Forum > FreeTrack : English Forum > Support : FreeTrack Software > Bug(?) - Yaw rotation inverts at high (80-90 deg) angle

RSS >  Bug(?) - Yaw rotation inverts at high (80-90 deg) angle
staylo #1 11/09/2007 - 00h48

Class : Apprenti
Posts : 8
Registered on : 31/08/2007

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Screenshots of Freetrack:
Top: Just to show setup (no bug occurring)
Middle: Just before bug occurs
Bottom: Shows bug occuring - note yaw axis flipped


With high yaw rotation the yaw rotation suddenly flips from + to -. It seems to occur when the 3 LED clip is rotated at about 90 degrees to the camera (Yes, it's painful to turn your eyes much further!)

The yaw rotation value at the bottom left of the Freetrack screen suddenly goes from ~ +150 to ~ -150.

The problem does not seem to occur when the clip is turned in the other direction (-ve yaw values)

The problem seems to occur in all the default profiles.

The problem occurs at a very specific point - around 150 degrees of yaw for me - by turning the clip slightly you can flip between -150 and +150 degrees.

-IR LEDs (the SFH...)
-3 LED clip with measurements checked (40x40mm, 30x30mm)
-RGB24 compression
-3 Green lights all the time ('bug' does not seem to be caused by loss of tracking)

-Freetrack.ini below:

[Defaults]
Tracking_Method=1
Threshold=210
Profile=rFactor 1 dot, 4 dots, 3 dots
LeftClipMount=0
HotkeyBeep=1
[HeadAids]
WhiteSky=1
Sphere=1
Axes=1
Labels=1
Tracking=1
LimitBox=1
LimitBoxAbs=1
LimitRotation=1
[Threepoint_leds]
x1=30
y1=30
x2=40
y2=40
[Fourpoint_leds]
x1=70
y1=80
z1=100
y2=20
z2=40
[center]
Yaw=50794
Pitch=-10047
Roll=59597
X=-2990657
Y=-71206
Z=252083
[Offset3Pts]
YX=0
XX=0
XY=0
XZ=0
[Inverted]
Yaw=0
Pitch=0
Roll=0
X=0
Y=0
Z=0
[Sensitivity]
Yaw=100
Pitch=100
Roll=1
X=100
Y=100
Z=100
[Deadzone]
Yaw=100
Pitch=100
Roll=100
X=100
Y=100
Z=100
Zooming=100
[Mapping]
Center=
Pause=
[Camera]
Fps=30
Name=Vimicro USB PC Camera (ZC0301)
Compressor={E436EB7D-524F-11CE-9F53-0020AF0BA770}
Kestrel #2 11/09/2007 - 04h35

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Class : Webmaster (admin)
Posts : 780
Registered on : 13/07/2007

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This is a bug with RGB24, use I420 if you can.

Fixed in next version.
Edited by Kestrel on 11/09/2007 at 04h36.
staylo #3 11/09/2007 - 09h28

Class : Apprenti
Posts : 8
Registered on : 31/08/2007

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Great ; )

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FreeTrack Forum > FreeTrack : English Forum > Support : FreeTrack Software > Bug(?) - Yaw rotation inverts at high (80-90 deg) angle

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