cam_pos      = [0.262033, 1.41287, 1.18194]';
cam_dir      = [0.197188, -0.127427, -0.972049]';
cam_up       = [-0.550113, 0.806324, -0.217297]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.07926, -0.768188, -0.118234]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;