3D-Compass

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3D compass is a sample Android application showing how to display a dynamically-updated 3D arrow with OpenGL that takes its direction from the orientation sensor, composited on top of a live camera preview image. The source code includes the following utility classes:

• CameraUseful: some routines for managing the camera and decoding image data
• GeomBuilder: basic management of 3D object geometry and rendering
• Lathe: uses GeomBuilder to construct objects with rotational symmetry
• Compass: how to use the orientation sensor data to draw a 3D compass arrow

Note that the compass direction is sometimes inaccurate--at least, on my HTC Desire it is. However, turning the phone this way and that will often nudge it back into a sensible reading.

Contents: src/ -- Java sources for the Android app jni/ -- C sources for the Android app res/ -- resources for the Android app AndroidManifest.xml, build.xml, *.properties -- for driving Google's Android build tools (note that you will have to provide a couple more of these--see INSTALL for details) README -- this file INSTALL -- build/installation instructions LICENSE -- licence (Apache 2.0, same as Google's sample code)

Lawrence D'Oliveiro [email protected]