transform coordinates values

[maister]

hello friends!!

I need to transform in centimeters the coordinates that return the camera , because I need subtract some distances for my project. any ideas?? the measures aren't lineal, 1 cm = any measure, but if I measure again with other distance 1 cm = any measure2, and measure != measure2

thanks a lot

[Birch]

1) Can you provide a little more information about what you are measuring and how?

2) You may be seeing some distortion through the capture volume area. You can test this by setting the value of the "Accuracy" tab to match the distance of two markers on a fixed rod, and then moving that rod through the volume.

Distortion in the capture volume can be affected by the quality of the calibration result and how thoroughly the volume was wanded. If you aren't already, make sure to get good wanding coverage through the entire capture volume area. If only a small subset of the desired capture volume area is wanded then the calibration will only optimize for that small area and tracking in the remaining area may be sub-optimal.

The accuracy of the tracking can also be affected by the number of cameras seeing a given marker. You can check that out by turning on the display of the cameras rays. Using the rays might help determine if too few cameras are seeing a marker, or whether there is a camera which is badly calibrated that is introducing error into the calculation.

[maister]

1) I download OptiTrack_sample_VC and execute this example. I get the value of Z in 30 cm measure with a meter. And after, I get the value of Z in 40 cm for example. With both values, I calculate the value of 1cm for the application.

[Birch]

Please see this response to your other post :

http://forum.naturalpoint.com/forum/ubb ... #Post40773