sad

Jacko

how can I read the extent to which the phone is tilted?

ar2rsawseen

for that you would need accelerometer, and use low pass filter to get gravity vector, based that you can calculate an angle tilt of the device.

Here is an example of setting box2d gravity based on accelerometer
http://appcodingeasy.com/Gideros-Mobile/Using-Accelerometer-with-Box2d-in-Gideros