Android的传感器对OpenGL [英] Android Sensors for OpenGL

问题描述

我想获取Android传感器与OpenGL的工作，以旋转的OpenGL的摄像头无论手机指向。

I want to get the android sensors to work with opengl to rotate the opengl's camera to wherever the phone is pointing to.

要详细说明：如果玩家在看着东，我想对OpenGL的摄像头指向东太上的游戏;如果玩家指向天空，我想指出了OpenGL的摄像头向天空等。

To elaborate: if the player is looking at east, I'd like to the opengl's camera points east too on the game; if the player points to the sky, I'd like to point the opengl's camera to the sky and so on.

我已经试过用 getRotationMatrix 并加载了OpenGL的矩阵，但它只能在上下方向的，如果我把电池的两侧，有是没有区别的。这是我做了什么至今（应用程序是在横向模式下）：

I've tried using getRotationMatrix and load the matrix on the opengl but it only works on the up-down direction, if I turn the cell to the sides, there is no difference. Here is what I've done so far (the app is in landscape mode):

    public void onSensorChanged(SensorEvent evt) {
    int type=evt.sensor.getType();
    float alpha = 0.8f;

    //Smoothing the sensor data a bit
    if (type == Sensor.TYPE_MAGNETIC_FIELD) {
      geomag[0]=geomag[0]*alpha+evt.values[0]*(1-alpha);
      geomag[1]=geomag[1]*alpha+evt.values[1]*(1-alpha);
      geomag[2]=geomag[2]*alpha+evt.values[2]*(1-alpha);
    } else if (type == Sensor.TYPE_ACCELEROMETER) {
      gravity[0]= gravity[0]*alpha+evt.values[0]*(1-alpha);
      gravity[1]= gravity[1]*alpha+evt.values[1]*(1-alpha);
      gravity[2]= gravity[2]*alpha+evt.values[2]*(1-alpha);
    }

    if ((type==Sensor.TYPE_MAGNETIC_FIELD) || (type==Sensor.TYPE_ACCELEROMETER)) {
      rotationMatrix = new float[16];
      SensorManager.getRotationMatrix(rotationMatrix, null, gravity, geomag);
      SensorManager.remapCoordinateSystem( 
        rotationMatrix, 
        SensorManager.AXIS_Y, 
        SensorManager.AXIS_MINUS_X, 
        rotationMatrix );
     if (AOGLRenderer.rotationmatrix==null) AOGLRenderer.rotationmatrix = new float[16];
     AOGLRenderer.rotationmatrix = rotationMatrix;
    }       
  }

而在OpenGL的code：

and in the opengl code:

        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | // OpenGL docs.
                       GL10.GL_DEPTH_BUFFER_BIT);
    gl.glLoadIdentity();
    if (rotationmatrix!=null) gl.glLoadMatrixf(rotationmatrix, 0);
    gl.glPushMatrix();
    gl.glTranslatef(0, 0, -70);
    g.draw(gl);
    gl.glPopMatrix();
    alpha+=2f;
    gl.glTranslatef(0, -15, 0);
    c.draw(gl);

我想，有人究竟是谁做的可以分享他们的code！我真的AP preciate吧！谢谢大家！

I'd like that someone who actually did it could share their code! I'd really appreciate it! Thank you all!

推荐答案

你提供空的倾斜度矩阵 - 这是不正确

You're supplying null for the inclination matrix - that's not correct.

SensorManager.getRotationMatrix(rotationMatrix, null, gravity, geomag);

有很多例子就如何使用的SensorManager的 getRotationMatrix（...）。

There are lots of examples on how to use the SensorManager's getRotationMatrix(...).

float[] R = new float[16];
float[] I = new float[16];

if (SensorManager.getRotationMatrix(R, I, accelerometerValues, geomagneticValues)) {
    float[] anglesInRadians = new float[3];
    SensorManager.getOrientation(R, anglesInRadians);
    ...
}

也的旋转的OpenGL的摄像头无论手机指向的是比较模糊的。举例来说，如果你的意思是某种形式的增强现实的方法，那么你应该映射 AXIS_X 到 AXIS_Z 。请注意，重映射可能甚至是必要的，如当你已经确定你的活动为横向模式。更多细节这里。

Also "rotate the opengl's camera to wherever the phone is pointing to" is rather ambiguous. For instance, if you meant some sort of a augmented reality approach, then you should be mapping AXIS_X to AXIS_Z. Note that remapping might not even be necessary, e.g. when you already fix your activity to landscape mode. More details here.

一些例如codeS涉及到的传感器数据和OpenGL ES：

Some example codes involving sensor data and OpenGL ES:

• <一个href="http://www.netmite.com/android/mydroid/cupcake/development/samples/Compass/src/com/example/android/compass/CompassActivity.java"相对=nofollow> CompassActivity
• <一个href="http://stackoverflow.com/questions/2881128/how-to-use-onsensorchanged-sensor-data-in-combination-with-opengl">How要结合使用onSensorChanged传感器数据与OpenGL的

这篇关于Android的传感器对OpenGL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！