cam_pos      = [0.633423, 1.45109, 0.109879]';
cam_dir      = [-0.824519, -0.133345, -0.549899]';
cam_up       = [-0.0150712, 0.976666, -0.214234]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.752293, 0.223908, 1.07369]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;