float aspectRatio;
        if(width > height)
        {
            aspectRatio = (float)width/(float)height;
            Matrix.frustumM(projectionMatrix, 0, -aspectRatio, aspectRatio, -1, 1, 1, 150);
        }
        else
        {
            aspectRatio = (float)height/(float)width;
            Matrix.frustumM(projectionMatrix, 0, -1, 1, -aspectRatio, aspectRatio, 1, 150);
        }