cam_pos      = [0.174778, 0.794683, -0.34479]';
cam_dir      = [0.983929, 0.0147557, 0.177949]';
cam_up       = [-0.176113, -0.0842334, 0.980759]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0391831, 1.32513, 0.106774]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;