cam_pos      = [0.0855358, 1.73161, 0.913203]';
cam_dir      = [-0.539668, -0.138436, 0.830418]';
cam_up       = [-0.529362, 0.822792, -0.206854]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.870651, 0.733129, 0.688033]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;