Yes. I have already tried that code and it works fine, but that is only for loading models, and I need to place them in the virtual space around the device. Anyway, thank you very much Raghav
El domingo, 8 de julio de 2012 19:55:18 UTC+2, Raghav Sood escribió: > > AndAR has a sample app capable of loading some obj/mtl models. See > http://code.google.com/p/andar > > On Sun, Jul 8, 2012 at 10:35 PM, santy > <[email protected]<[email protected]> > > wrote: > >> 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<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 >> > > > > -- > Raghav Sood > Please do not email private questions to me as I do not have time to > answer them. Instead, post them to public forums where others and I can > answer and benefit from them. > http://www.appaholics.in/ - Founder > http://www.apress.com/9781430239451 - Author > +91 81 303 77248 > -- 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
