FreeTrack Forum - Distance/Orientation from the camera

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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Distance/Orientation from the camera

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djzentar	#1 08/02/2009 - 20h06 Top
Class : Apprenti Posts : 13 Registered on : 26/01/2009 Off line	Hi wanted to know if i have to setup my distance and orientation to the camera somewhere? Because my head is pretty low when in front of the monitor that's because i'm using a playseat with a wheel. Are the calibration settings in the model selection screen (3 points cap in my case) the things i have to setup for this? See my little sketch for the situation. Can anyone help me with this, thanks in advance. Edited by djzentar on 08/02/2009 at 20h07.
djzentar	#2 10/02/2009 - 13h56 Top
Class : Apprenti Posts : 13 Registered on : 26/01/2009 Off line	no one?
vagos	#3 15/02/2009 - 23h05 Top
Class : Apprenti Posts : 22 Registered on : 12/02/2009 Off line	The cam configuration is perfect as soon as the 3 dot points are around the center of the free track software. This will enable you to move freely without the points get out of the cameras sight. In my opinion high up is the best place like your configuration.
las6	#4 18/02/2009 - 00h40 Top
Class : Apprenti Posts : 10 Registered on : 13/02/2009 Off line	If I'm not mistaken, there isn't any other way to "calibrate" the camera except for the sensor size / focal length settings. But it is unlikely that you have this information and thus it would be rather hard to set up any values. In my case, I had to push my monitor back somewhat because the FoV or the viewing angle for the webcam simply wasn't enough to cover the whole range of motions. For most models (1 cap, 3 cap...) you do need a camera that is above or at the same level as the led, otherwise your head or the cap could block the line of sight to some of the leds. If you sit very low, it might cause problems for the motion tracking, but I suspect it'll still work well enough for racing games. Just test it and see how the points move while you move head up/down. It should be pretty easy to see if it's going to work or not. (if both motions look the same to Freetrack then there's going to be problems)
djzentar	#5 21/02/2009 - 14h14 Top
Class : Apprenti Posts : 13 Registered on : 26/01/2009 Off line	Thanks for the reply. My FOV is not really a problem, my model translates to about 1/3 of the whole camera frame... but as you said i don't have the exact sensor size and focal length of my cam, so i just have to make do... I had unwanted pitch before, but now it almost gone after i tweaked the setting a bit. I got the most difference when i rechecked my setting concerning my models distance to the reference point (R). I get perfect result when i put my camera at the same height as my cap, but that's not a workable situation because my camera is then in front of my monitor
Lorifel	#6 08/01/2013 - 21h01 Top
Class : Apprenti Posts : 1 Registered on : 08/01/2013 Off line	Try Cam -> Orientation option Orientation Often the camera is positioned on top of a monitor and pitched down at an angle towards the head position; without accounting for the pitch angle, forward-back movement can cause some vertical movement and vice versa. To address this, the orientation of the camera can be accounted for so that the direction of virtual head translation corresponds with reality. Yaw: Positive anti-clockwise looking down from above Pitch: Positive up. Roll: Positive clockwise looking at camera. Since the Wiimote can determine its own pitch and roll using internal accelerometers, these can be set to auto. The sensitivity of the accelerometers is reduced so that small movements aren't detected which would otherwise cause problems while in use. Setting roll to auto rotates the camera display.

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Distance/Orientation from the camera

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