I wrote a test application that registers with the SensorManager as a
SensorListener to receive orientation updates and rotates a unit cube
with respect to the current orientation. This is mostly a modified
version of CubeRenderer from the API examples.
In a fixed position (i.e., the phone on the desk) the cube wobbles
about 5 degrees with respect to each angular parameter. When rotating
the phone, the sensor is even less accurate.
I've tried setting the orientation both with glRotate and with an
explicit matrix formulation of the XYZ Eulerian angles, where the
angular measure is in radians, as,
float[] cg2 = new float[16];
cg2[0] = (float)(Math.cos(_pitch) * Math.cos(_roll));
cg2[1] = (float)(-Math.sin(_azimuth) * Math.sin(_pitch) *
Math.cos(_roll) - Math.cos(_azimuth) * Math.sin(_roll));
cg2[2] = (float)(-Math.cos(_azimuth) * Math.sin(_pitch) *
Math.cos(_roll) + Math.sin(_azimuth) * Math.sin(_roll));
cg2[3] = 0.0f;
cg2[4] = (float)(Math.cos(_pitch) * Math.sin(_roll));
cg2[5] = (float)(-Math.sin(_azimuth) * Math.sin(_pitch) *
Math.sin(_roll) + Math.cos(_azimuth) * Math.cos(_roll));
cg2[6] = (float)(-Math.cos(_azimuth) * Math.sin(_pitch) *
Math.sin(_roll) - Math.sin(_azimuth) * Math.cos(_roll));
cg2[7] = 0.0f;
cg2[8] = (float)(Math.sin(_pitch));
cg2[9] = (float)(Math.sin(_azimuth) * Math.cos(_pitch));
cg2[10] = (float)(Math.cos(_azimuth) * Math.cos(_pitch));
cg2[11] = 0.0f;
cg2[12] = 0.0f;
cg2[13] = 0.0f;
cg2[14] = -10.0f;
cg2[15] = 1.0f;
gl.glLoadMatrixf(cg2, 0);
Both, gives this same result. Does this behavior sound like it is
correct? If so, is there any way to improve upon it other than doing a
moving average of the last $n$ orientation updates?
Thanks,
---
Joshua Shaffer
PhD Student
Dept. of Materials Science
Drexel University
215-895-2327
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers-unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
-~----------~----~----~----~------~----~------~--~---
