InMotion Posted January 1, 2005 Report Share Posted January 1, 2005 Peter, I have a customer in South Africa that purchased a motion simulator from us a few months ago and he's using FS2004 with FSUIPC. We noticed the ptich (Z axis) acceleration data was not behaving correctly in the simulator. After I looked at the Z axis data from FS2004/FSUIPC, and I tested several addresses ($3070, $3078, $31D0), I noticed there were spikes in the data. This is obviously a problem with a motion simulator. The motion will act "jerky" because of the spiking. I then tried to write my own acceleration data using [delta v / delta t] and unfortunately, the velocity data was also spiking and couldn't use it. I ended up using a homemade formula for acceleration that doesn't spike. But I would like to know if there is a way to prevent the spiking. I don't see the spiking problem with the other axis'. Thanks! Regards, Mark Barry InMotion Simulation 928.759.0631 http://www.inmotionsimulation.com Link to comment Share on other sites More sharing options...
Pete Dowson Posted January 1, 2005 Report Share Posted January 1, 2005 After I looked at the Z axis data from FS2004/FSUIPC, and I tested several addresses ($3070, $3078, $31D0), I noticed there were spikes in the data. This is obviously a problem with a motion simulator. The motion will act "jerky" because of the spiking. I then tried to write my own acceleration data using [delta v / delta t] and unfortunately, the velocity data was also spiking and couldn't use it. I ended up using a homemade formula for acceleration that doesn't spike. But I would like to know if there is a way to prevent the spiking. I don't see the spiking problem with the other axis'. Thanks! Sorry, I really have no idea why FS would do that. FSUIPC is only passing on the information it gets. In fact I think that those locations are mapped directly into FS's own data areas. You mention 3070, 3078 and 31D0 and call them "pitch" accelerations, but the Z axis in FS is the longitudinal one -- forward/backward. The FS team name them in terms of screen-type orientation, Y up/down, X left/right, Z forward/back. Both 3070 and 31D0 are Z-axis, not pitch values. 3078 is a pitch acceleration. Is that the one you mean? Maybe you need to add some form of digital filtering into the values to smooth out the spikes? Regards, Pete Link to comment Share on other sites More sharing options...
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