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OpenGL矩阵中有一个重要的矩阵，视图矩阵。
把物体从世界坐标系转化到视点坐标系的矩阵称为视图矩阵。
记录一下用过的经验。
视图矩阵有三组向量，分别是视点，观察点和Up向量。
视点，即眼睛观察的位置，x轴表示从x轴侧看，y轴表示从y轴斜看，z轴从z轴方向看.
z轴一般决定远近，物体的大小，值远大，观测的距离就越远，图形显示效果看着就越小。 x轴，y轴决定了物体的角度。观察点，修改x，y轴，图像会沿x，y轴移动。z轴的值必须小于视点z轴的值，否则看不见图像。
Up向量，如果拿着相机，这就是我们的头部要指向的地方。范围为0.0f-1.0f，如果z轴为0，设置x轴和y轴，会使图像沿着z轴旋转。
/*** Store the view matrix. This can be thought of as our camera. This matrix transforms world space to eye space;* it positions things relative to our eye.*/private float[] mViewMatrix = new float[16];// Position the eye behind the origin.final float eyeX = 0.0f;final float eyeY = 0.0f;final float eyeZ = 20f;// We are looking toward the distancefinal float centerX = 0.0f;final float centerY = 0.0f;final float centerZ = 19.9f;// Set our up vector. This is where our head would be pointing were we holding the camera.final float upX = 0.5f;final float upY = 1.0f;final float upZ = 0.0f;// Set the view matrix. This matrix can be said to represent the camera position.// NOTE: In OpenGL 1, a ModelView matrix is used, which is a combination of a model and// view matrix. In OpenGL 2, we can keep track of these matrices separately if we choose.Matrix.setLookAtM(mViewMatrix, 0, eyeX, eyeY, eyeZ, centerX, centerY, centerZ, upX, upY, upZ);
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