Hi! I'm develop an AR app, too. Do you have solved this problem?
On 24 Feb, 02:07, "nikola.borisof" <nikola.bori...@gmail.com> wrote: > Hi all, > > I spend two weeks now trying to get this working with no success. Here > is what I want to do: > > I have several geo points around the user and his phone. I want to > display this point overlaying them on the input from the camera (kind > of standard AR (AugmentedReality) app). Part of my requirements are > that the user can use the phone in either landscape or portrait mode. > > My plan was like this. > > 1. Register for Sensor.TYPE_ACCELEROMETER, Sensor.TYPE_MAGNETIC_FIELD > 2. Pass the result to SensorManager.getRotationMatrix(), getting back > the R matrix that should be telling me how to translate points from > the Phone coordinate system (defined > here:http://developer.android.com/reference/android/hardware/SensorEvent.html) > to World coordinate system (x -> East, y -> North, z -> Sky) > 3. I want to translate points from World to Phone so I take the > inverse of R (I'm using Matrix.invertM()) to get R_In > 4. Using the GPS I translate the geo points I want to display on the > camera to points in the World coordinate system and then I run them > through the R_In matrix to get their coordinates in the Phone system. > 5. Draw the points in the screen only if the have (phone coordinates) > z < 0 and x and y such that they are visible... > > This is my grand plan... however I have problems quite early (2). I do > get the R matrix back and it looks good when I align the phone to the > world coordinate system ( I get the identity matrix ). However when I > try to translate an imaginary point from the Phone coordinate system > say (0, 1, 0) to the World coordinate system I don't get the numbers I > expect. > > For example when i expect (1, 0, 0) i get (-1, 0, 0) > when i expect (0, 0, 1) i get (0, 0, -1) > > I haven't done any remapping of the coordinate system and I feel I > don't need too... > Is this the right approach? Any suggestions for me? > > Thanks -- 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 To unsubscribe, reply using "remove me" as the subject.
