cam_pos      = [0.69838, 1.64486, 0.327699]';
cam_dir      = [-0.392366, -0.369167, -0.842475]';
cam_up       = [-0.0241953, 0.919749, -0.39176]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.22292, 0.177328, 0.491849]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;