I´ve been trying and studying some examples but I don´t have OpenGL knowledges enough to implement what I need. I´ve been trying with Junaio too, but It doesn´t fit to my project. I tried with LookAR too, but the resolution is very low. Is there any framework, as LookAR, that can do easily what I need? (I am not an expert in OpenGL)
Thank you El jueves, 5 de julio de 2012 20:33:27 UTC+2, Nobu Games escribió: > > With that device rotation matrix you can only rotate your objects around > the screen, where the rotation center point is the center of the device. > This is independent of GPS location coordinates, and as the name of that > matrix suggests, it is really rotation only, not translation (moving around > the objects on any axis). > > But to answer your question: yes, it is possible to just use the sensor > data without GPS and have 3D objects move around on the screen. And it will > work well for most use cases, like augmented reality games where you > usually sit as a player and move the camera around. > > If you need to change the positioning of the 3D objects according to the > current device location and movement, it gets a bit more complicated. > > You could make use of the GPS coordinates for translation but it wouldn't > be real time suitable, because GPS alone is usually not precise enough. You > need to combine several sensors (including the camera) for making an > augmented reality app possible that gives a seamless experience and allows > the user to freely walk around. > > You could make use of acceleration sensor data for getting an idea of the > current device / user movement direction. With that information you could > predict a translation until the next GPS location update gives you > certainty about the current location. > > You also could make use of realtime image analysis for calculating the > current movement direction based on changes in the video preview frames. > > > > On Thursday, July 5, 2012 1:11:20 PM UTC-5, santy wrote: >> >> Thank you very much Nobu. And is it possible to place the 3D object just >> to see the object with the camera on its position without using the GPS??? >> >> >> El jueves, 5 de julio de 2012 20:02:03 UTC+2, Nobu Games escribió: >>> >>> On Thu, Jul 5, 2012 at 12:47 PM, santy wrote: >>> >>>> Yes, of course I have been trying with all the frameworks I have found >>>> (LooakAR, min3D...) and I am sure I can do what I need with them but I >>>> don´t know how. I wrote here in order to find someone who has done exactly >>>> the same I have to do (there must be a lot) and to know how they did it (I >>>> need a tutorial that explains it or some advices). >>>> >>>> Thanks >>>> >>>> >>>> El jueves, 5 de julio de 2012 19:40:21 UTC+2, Nobu Games escribió: >>>>> https://www.google.com/search?q=Android+Augmented+Reality >>>> >>>> >>> You need to make use of SensorManager and register a SensorListener in >>> order to construct a device rotation matrix. Luckily Android already >>> provides a method that calculates that matrix which is ready for use in >>> OpenGL: >>> >>> SensorManager.getRotationMatrix()<http://developer.android.com/reference/android/hardware/SensorManager.html#getRotationMatrix%28float[],%20float[],%20float[],%20float[]%29> >>> . >>> >>> *This matrix is ready to be used by OpenGL ES's glLoadMatrixf(float[], >>>> int)<http://developer.android.com/reference/javax/microedition/khronos/opengles/GL10.html#glLoadMatrixf%28float[],%20int%29>. >>>> >>>> * >>>> >>>> * Note that because OpenGL matrices are column-major matrices you must >>>> transpose the matrix before using it. However, since the matrix is a >>>> rotation matrix, its transpose is also its inverse, conveniently, it is >>>> often the inverse of the rotation that is needed for rendering; it can >>>> therefore be used with OpenGL ES directly. * >>>> >>> You also may want to implement an algorithm that reduces the noise from >>> the sensor data, otherwise the 3D objects will jitter on the screen. The >>> simplest approach is calculating a median and / or weighted average over >>> time. >>> >> -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
