cam_pos      = [0.0077209, 1.1584, -0.704549]';
cam_dir      = [-0.830164, -0.179224, 0.527927]';
cam_up       = [-0.112787, 0.98133, 0.15579]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.726169, -0.0928179, 1.11039]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;